IAU Circulars (IAUCs) - циркуляры МАС - 10/2010

Re: IAU Circulars (IAUCs) - циркуляры МАС - 10/2010

Сообщение Tikhon » 07 дек 2010, 16:03

20 October 2010
IAU Electronic Telegram No.2511


SUPERNOVA 2010iw

G. H. Marion, Harvard-Smithsonian Center for Astrophysics and University
of Texas; J. Vinko, University of Szeged; and J. C. Wheeler, University of
Texas, report that a spectrum (range 430-1000 nm) of SN 2010iw (cf. CBET 2505)
was obtained by S. Rostopchin on Oct. 19 UT with the 9.2-m Hobby-Eberly
Telescope (+ Marcario Low-Resolution Spectrograph). Cross-correlation with a
library of supernova spectra using the "Supernova Identification" code (SNID;
Blondin and Tonry 2007, Ap.J. 666, 1024) shows that 2010iw is a peculiar
type-Ia supernova near maximum brightness. The spectrum most closely
resembles that of SN 2000cx at maximum, but the measured velocity of Si II
(635.5 nm) for 2010iw is 10300 km/s, which is much lower than reported for SN
2000cx at this epoch by Li et al. (2003, PASP 115, 453).

NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
superseded by text appearing later in the printed IAU Circulars.

2010 October 20 (CBET 2511) Daniel W. E. Green
Модератор Астрономического Форума ASTROTALK
Аватара пользователя
Tikhon
Модератор форума
 
Сообщения: 2802
Зарегистрирован: 20 окт 2008, 18:54

Re: IAU Circulars (IAUCs) - циркуляры МАС - 10/2010

Сообщение Tikhon » 07 дек 2010, 16:03

21 October 2010
IAU Electronic Telegram No.2512


COMET 103P/HARTLEY

M. F. A'Hearn and L. M. Feaga, on behalf of the DIXI/EPOXI science team,
report that routine sampling with the Deep Impact Medium Resolution Imager
(MRI) enabled the discovery of an unusual cometary phenomenon on comet 103P
(sometimes known by its old name, "Hartley 2") that may recur. Between Sept.
9 and 17, the outgassing of CN, as acquired with the CN filter (sensitive to
both the dust continuum and CN gas), increased by a factor of five and then
slowly decreased, returning to its prior trend line by Sept. 24. There was
no apparent change in the reflected continuum, acquired with a clear filter,
other than a small, gradual increase consistent with the increases before
and after this period in both CN and dust due to the decreasing range from
the spacecraft to the comet and the increasing activity of the nucleus as it
approaches the sun. This long-duration, gradual increase and decrease of
gaseous emission without any increase in the dust is very unlike typical
cometary outbursts, which have sudden onsets and are usually accompanied by
considerable dust. It is dissimilar to the activity observed at comet 9P
(old-style name "Tempel 1") and not apparently associated with the dust-free
CN jets observed in this and other comets. Thus it is not like anything
that the authors are aware of in any other comet. Observers should be aware
of this type of activity when planning observations and interpreting their
data. In addition, H_2O and CO_2 have been unambiguously detected in the
coma using the High Resolution Instrument infrared spectrometer (HRI-IR) on
Oct. 16.

N. H. Samarasinha and B. E. A. Mueller, Planetary Science Institute; and
M. F. A'Hearn and T. L. Farnham, University of Maryland, obtained CN
narrowband images at the Kitt Peak National Observatory 2.1-m telescope from
Sept. 30 to Oct. 4 UT. The enhanced images clearly indicate the rotation of
a jet feature centered around a position angle near 30 deg. This is
presumably the same feature reported by Knight et al. (IAUC 9163). This
feature moves from the northwest towards the earth's direction, almost towards
the line of sight, and then moves to the east-northeast and finally to the
far side before starting the cycle again; while on the far side from the
earth, its level of activity decreases significantly before starting to
increase again. The repeatability of the CN morphology is consistent with a
periodicity around 17.6 hours. Small differences in the morphology during
some cycles suggest that there may be a slight rotational excitation, probably
a low-excitation short-axis mode. The CN coma morphology is compatible with
a nucleus having a high obliquity and a retrograde rotation and suggests a
low-to-mid-latitude active region in the negative hemisphere. A preliminary
estimate for the rotational angular momentum vector is R.A. = 345 deg, Decl.
= -15 deg, and the uncertainty is as large as 20 deg in some directions. The
continuum images from the same observing run show the dust tail, but no clear
jet features are discernible.

M. Knight and D. Schleicher, Lowell Observatory, report new narrowband
imaging of comet 103P using the Hall 1.1-m telescope at Lowell Observatory.
Further to Knight et al. (IAUC 9163), the CN gas feature was centered at
a position angle near 355 deg on 2010 Aug. 13-17, near 350 deg on Sept. 9-13,
and near 350 deg on Oct. 16, 17, and 19. Numerical modeling of these position
angles and the sense of rotation yields a rotation axis having an obliquity of
about 15 deg in the comet's orbital frame, corresponding to R.A. = 310 deg,
Decl. = +80 deg, assuming principal axis rotation. Preliminary modeling
suggests that the CN jet originates at a latitude of +50 to +60 deg. An
additional, fainter CN feature was seen towards the southeast in the October
1.1-m-telescope images and in additional images obtained Oct. 12-14 on the
0.8-m telescope at Lowell Observatory. For this pole solution, the comet's
maximum sub-Earth latitude is attained in early October, resulting in an
overlap of the two CN features towards the east, as was observed in the Oct.
12-14 images and possibly explaining the morphology described by Samarasinha
et al. (above). With this pole solution, the sub-earth latitude should be
near the comet's equator at the time of the EPOXI spacecraft encounter,
yielding side-on corkscrews.

NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
superseded by text appearing later in the printed IAU Circulars.

2010 October 21 (CBET 2512) Daniel W. E. Green
Модератор Астрономического Форума ASTROTALK
Аватара пользователя
Tikhon
Модератор форума
 
Сообщения: 2802
Зарегистрирован: 20 окт 2008, 18:54

Re: IAU Circulars (IAUCs) - циркуляры МАС - 10/2010

Сообщение Tikhon » 07 дек 2010, 16:03

23 October 2010
IAU Electronic Telegram No.2513


ORIONID METEORS 2010

P. Jenniskens, SETI Institute, reports that the Orionid shower has
elevated rates of bright meteors, as predicted by M. Sato and J.-I. Watanabe
(cf. CBET 2507). Preliminary visual counts collected by the International
Meteor Organization give a Zenith Hourly Rate ZHR 34+/-4 on Oct 21.0 UT,
well above the normal peak rate of 20. J. M. Trigo-Rodriguez (Inst. Space
Sciences-CSIC), J. M. Madiedo (Univ. Huelva), P. Pujols (Agrup. Astronomica
Osona), J. A. de los Reyes (Murta Observatory), J. Alonso-Azcarate (Univ.
Castilla La Mancha) and J. Zamorano (Univ. Complutense Madrid) report that
their video stations operating in the framework of the Spanish Fireball
Network have detected high activity of Orionid meteors on Oct. 21.1 with ZHR
30+/-6 (chi = 2.0, N= 40, m < +4). Bright orionids were detected also
during Oct. 22.04-22.21 UT. This elevated activity is expected to continue
for one or more days.

NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
superseded by text appearing later in the printed IAU Circulars.

2010 October 23 (CBET 2513) Brian G. Marsden
Модератор Астрономического Форума ASTROTALK
Аватара пользователя
Tikhon
Модератор форума
 
Сообщения: 2802
Зарегистрирован: 20 окт 2008, 18:54

Re: IAU Circulars (IAUCs) - циркуляры МАС - 10/2010

Сообщение Tikhon » 07 дек 2010, 16:04

27 October 2010
IAU Electronic Telegram No.2514


SUPERNOVA 2010ja IN NGC 2513

G. Pignata, and M. Cifuentes, Universidad Andres Bello; J. Maza, M. Hamuy,
R. Antezana, L. Gonzalez, R. Cartier, and F. Forster, Universidad de Chile; P.
Gonzalez, Pontificia Universidad Catolica de Chile; B. Conuel, Wesleyan
University; G. Folatelli, Institute for the Physics and Mathematics of the
Universe (IPMU), University of Tokyo; and D. Reichart, K. Ivarsen, J. Haislip,
A. Crain, D. Foster, M. Nysewander, and A. LaCluyze, University of North
Carolina at Chapel Hill, on behalf of the CHASE project, report the discovery
of an apparent supernova (mag approximately 17.9) on an unfiltered image taken
on Oct. 15.35 UT with the 0.41-m 'PROMPT 1' telescope located at Cerro Tololo.
The new object is located at R.A. = 8h02m28s.39 +/- 0".2, Decl. = +9o23'40".9
+/- 0".2 (equinox 2000.0), which is about 55" east and 68" south of the center
of the galaxy NGC 2513; nothing is visible at this position on stacked
archival images taken between Jan. 8.13 and Mar. 19.04 (limiting mag 19.5),
but 2010ja is visible at mag approximately 18.0 on images taken on Oct. 16.34
and 17.33.

N. Morrell, Las Campanas Observatory; and G. Folatelli, IPMU, University
of Tokyo, reports on spectroscopic observations (range 330-950 nm) of 2010ja,
obtained on Oct. 22.4 UT with the Boller and Chivens spectrograph attached to
the 2.5-m du Pont telescope at Las Campanas Observatory. The low-signal-noise
spectrum of 2010ja is that of an evolved type-Ia supernova; cross-correlation
with a library of supernova using SNID (Blondin and Tonry 2007, Ap.J. 666,
1024) shows 2010? to be most similar to SN 1991bg at about three months after
maximum light.

NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
superseded by text appearing later in the printed IAU Circulars.

2010 October 27 (CBET 2514) Daniel W. E. Green
Модератор Астрономического Форума ASTROTALK
Аватара пользователя
Tikhon
Модератор форума
 
Сообщения: 2802
Зарегистрирован: 20 окт 2008, 18:54

Re: IAU Circulars (IAUCs) - циркуляры МАС - 10/2010

Сообщение Tikhon » 07 дек 2010, 16:04

28 October 2010
IAU Electronic Telegram No.2515


COMET 103P/HARTLEY

J. K. Harmon, M. C. Nolan, and E. S. Howell, Arecibo Observatory;
and J. D. Giorgini, Jet Propulsion Laboratory, obtained 150-m-resolution
radar images and radar doppler spectra for comet 103P/Hartley on Oct. 24-27
using the Arecibo Observatory 12.6-cm planetary radar. The images show
the nucleus to be a highly elongated, bilobate object with a long-axis
dimension of at least 2.2 km. The images give a preliminary rotation period
estimate of 18.1 +/- 0.3 hours, although a less-likely period of 13.2 hours
cannot be ruled out. The radar cross section of the nucleus is 0.04 km^2.
The doppler spectra show a broadband echo component from large (> cm-size)
ejected grains in the inner coma. The radar cross section of the large-grain
coma is 0.6 km^2. This echo component is preferentially redshifted,
indicating that the bulk of the grain ejection is in the anti-earthward
direction. The characteristic radial velocity dispersion of the grains is
4 m/s.

N. H. Samarasinha and B. E. A. Mueller, Planetary Science Institute;
and M. F. A'Hearn and T. L. Farnham, University of Maryland, report that
CN narrowband images taken at the Kitt Peak National Observatory 2.1-m
telescope from Sept. 1-3 UT show coma structure nearly similar to, but with
distinct differences from, that described by Samarasinha et al. (cf. CBET
2512) for the interval Sept. 30-Oct. 4. In the images from early September,
the northwest jet moves to the south of the nucleus and then towards the east
making an archimedean spiral-like feature. This indicates a low-latitude
active region in the negative hemisphere of the nucleus for the rotational
angular momentum direction described by Samarasinha et al. (CBET 2512).
There are subtle indications as to the presence of a second jet, probably
overlapping with the primary jet, in the east/northeast direction. The best
repeatability of the morphology is seen for a periodicity near 17.1 hours --
in contrast to the near-17.6 hours derived from the Sept. 30-Oct. 4 data set.
The apparent differences in the periodicities of the repeatability during
different observing runs is suggestive of a changing rotational state and/or
a non-principal-axis rotational state. A preliminary outflow speed based on
the CN features is 0.7 km/s. No obvious feature other than the dust tail is
observed in the continuum images. Due to rapid changes in the observing
geometry during the coming days, the CN morphology is likely to show distinct
evolutions and observers are encouraged to obtain additional CN images.

M. Drahus, D. Jewitt, and A. Guilbert, University of California at
Los Angeles; D. Lis, California Institute of Technology; and W. Waniak,
Jagiellonian University, obtained velocity-resolved spectral time series of
HCN at the James Clerk Maxwell Telescope (JCMT) and the Caltech Submillimeter
Observatory (CSO) on Mauna Kea. JCMT observations of the J=4-3 transition
were carried out from Sept. 29 to Oct. 1 UT and from Oct. 16 to Oct. 19 UT.
CSO observations of the J=3-2 line were taken from Oct. 23 to Oct. 24 UT.
A very strong variability of the line area on a time scale of hours is
observed, reaching up to a factor of four, and accompanied by changes of the
line profile. The variability appears inconsistent with the 16.6-hr rotation
period reported by Meech et al. (2009, BAAS 41, 1029) and Knight et al.
(2010, IAUC 9163 and CBET 2418), and with the 17.6-hr period reported by
Samarasinha et al. (CBET 2512). It is anticipated that there will be a much
longer rotation period, significant excitation of the rotation state (cf.
Samarasinha et al., CBET 2512), or a non-periodic nature of the detected
variability.

NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
superseded by text appearing later in the printed IAU Circulars.

2010 October 28 (CBET 2515) Michael Rudenko
Модератор Астрономического Форума ASTROTALK
Аватара пользователя
Tikhon
Модератор форума
 
Сообщения: 2802
Зарегистрирован: 20 окт 2008, 18:54

Re: IAU Circulars (IAUCs) - циркуляры МАС - 10/2010

Сообщение Tikhon » 07 дек 2010, 16:04

30 October 2010
IAU Electronic Telegram No.2516


APPARENT NOVA IN M31: M31N 2010-10d

An apparent nova in the galaxy M31 has been discovered by several
different observers.
Koichi Nishiyama, Kurume, Japan; and Fujio Kabashima, Miyaki, Japan,
report the discovery of a possible nova of mag 17.8 on ten 40-s unfiltered
CCD frames (limiting magnitude 19.5) taken around Oct. 29.478 UT with a
Meade 200R 0.40-m f/9.8 reflector (+ SBIG STL1001E camera). The new object
is located at R.A. = 0h42m36s.91, Decl. = +41o19'29".9 (equinox 2000.0),
which is 84" west and 201" north of the center of the galaxy M31. Nothing
is visible at this position on their past frames taken on Oct. 26.550 and
27.642 (limiting magnitude 19.3 ) or on a Digitized Sky Survey image from
1986 Nov. 27 (limiting red mag 18.7). The nearest star in the Massey M31
catalogue (cf. website URL http://www.lowell.edu/users/massey/lgsurvey.html)
has position end figures 37s.01, 30".8 (distance 1".4; magnitudes V = 22.6,
B = 23.4, R = 22.5).
Guoyou Sun, Wenzhou, Zhejiang, China; and Xing Gao, Urumqi, Xinjiang,
China, report the discovery of a possible nova at mag approximately 18.5
on several 60-s unfiltered survey images (limiting mag about 19.5) taken by
Xing Gao in the course of the Xingming Observatory Sky Survey around Oct.
29.587 UT using a Celestron C14 Schmidt-Cassegrain telescope at Mt. Nanshan.
The new object is approximately located at R.A. = 0h42m36s.97, Decl. =
+41o19'28".7 (equinox 2000.0), which is about 110" west and 200" north of
the center of NGC 224 = M31. Nothing is visible at this position on archival
images taken on Oct. 26.536 (limiting mag 19.0), Oct. 27.602 (limiting mag
19.5), or Oct. 28.661 (limiting mag 19.5). The images can be seen at the
following website URL: http://www.xjltp.com/XOSS/XM10AK/XM10AK.htm.
Kamil Hornoch, Astronomical Institute, Ondrejov, reports his discovery
of an apparent nova in M31 on a co-added 1260-s R-band CCD frame taken on
Oct. 29.729 UT with the 0.65-m telescope at Ondrejov. The new object is
well visible on the co-added frame, as well as on single images used for
the co-added frame, but is not present on numerous archive images taken at
Lelekovice and Ondrejov. The object is visible also on a pre-discovery
Ondrejov R-band CCD frame taken on Oct. 28.719 UT. Available R-band
magnitudes for M31N 2010-10d, measured by Hornoch: Oct. 22.934 UT, [20.6
(K. Hornoch and P. Hornochova, 0.65-m telescope at Ondrejov); 28.719, 19.8
+/- 0.25 (Hornoch and M. Wolf, 0.65-m telescope at Ondrejov); 29.729, 17.85
+/- 0.1 (Hornoch, 0.65-m telescope at Ondrejov). M31N 2010-10d is located at
R.A. = 0h42m36s.91, Decl. = +41o19'29".6 (equinox 2000.0), which is 84" west
and 201" north of the center of M31.

NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
superseded by text appearing later in the printed IAU Circulars.

2010 October 30 (CBET 2516) Michael Rudenko
Модератор Астрономического Форума ASTROTALK
Аватара пользователя
Tikhon
Модератор форума
 
Сообщения: 2802
Зарегистрирован: 20 окт 2008, 18:54

Re: IAU Circulars (IAUCs) - циркуляры МАС - 10/2010

Сообщение Tikhon » 07 дек 2010, 16:05

31 October 2010
IAU Electronic Telegram No.2517


SUPERNOVA 2010iz IN UGC 3552

P. Challis and H. Marion, Harvard-Smithsonian Center for Astrophysics
(CfA), on behalf of the CfA Supernova Group, reports that spectroscopic
observations (range 360-760 nm) of 2010iz (cf. CBET 2510), obtained on
Oct. 30 UT by M. Calkins with the F. L. Whipple Observatory 1.5-m telescope
(+ FAST), show that 2010iz is a type-II supernova. Cross-correlation with
a library of supernova spectra using the "Supernova Identification" code
(SNID; Blondin and Tonry 2007, Ap.J. 666, 1024) indicates that 2010iz is
a type-IIP supernova at about two weeks past maximum light.

NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
superseded by text appearing later in the printed IAU Circulars.

2010 October 31 (CBET 2517) Michael Rudenko
Модератор Астрономического Форума ASTROTALK
Аватара пользователя
Tikhon
Модератор форума
 
Сообщения: 2802
Зарегистрирован: 20 окт 2008, 18:54

Re: IAU Circulars (IAUCs) - циркуляры МАС - 10/2010

Сообщение Tikhon » 07 дек 2010, 16:05

31 October 2010
IAU Electronic Telegram No.2518


SUPERNOVA 2010im

M. Ergon, Stockholm University; S. Benetti and F. Bufano, Istituto
Nazionale di Astrofisica, Osservatorio di Padova; A. Pastorello, Queen's
University, Belfast; and J. Sollerman, Stockholm University, on behalf of
a larger collaboration, report that a spectrogram of 2010im (cf. CBET 2484),
obtained on Oct. 30.03 UT with the European Southern Observatory's New
Technology Telescope (+ EFOSC2; range 370-920 nm; resolution 2.8 nm) is
consistent with that of a type-Ia supernova about 50 days old at a redshift
of about 0.018.

NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
superseded by text appearing later in the printed IAU Circulars.

2010 October 31 (CBET 2518) Michael Rudenko
Модератор Астрономического Форума ASTROTALK
Аватара пользователя
Tikhon
Модератор форума
 
Сообщения: 2802
Зарегистрирован: 20 окт 2008, 18:54

Re: IAU Circulars (IAUCs) - циркуляры МАС - 10/2010

Сообщение Tikhon » 07 дек 2010, 16:05

31 October 2010
IAU Electronic Telegram No.2519


SUPERNOVA 2010ix IN PGC 3583

P. Challis and H. Marion, Harvard-Smithsonian Center for Astrophysics
(CfA), on behalf of the CfA Supernova Group, reports that spectroscopy (range
360-760 nm) of 2010ix (cf. CBET 2506), obtained on Oct. 31 UT by M. Calkins
with the F. L. Whipple Observatory 1.5-m telescope (+ FAST), shows that 2010ix
is a type-Ia supernova. Cross-correlation with a library of supernova
spectra using the "Supernova Identification" code (SNID; Blondin and Tonry
2007, Ap.J. 666, 1024) indicates that 2010ix is a normal type-Ia event at
about two weeks past maximum light.

NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
superseded by text appearing later in the printed IAU Circulars.

2010 October 31 (CBET 2519) Daniel W. E. Green
Модератор Астрономического Форума ASTROTALK
Аватара пользователя
Tikhon
Модератор форума
 
Сообщения: 2802
Зарегистрирован: 20 окт 2008, 18:54

Re: IAU Circulars (IAUCs) - циркуляры МАС - 10/2010

Сообщение Tikhon » 07 дек 2010, 16:06

5 October 2010
IAU Circular No.9172


COMET P/2010 T1 (McNAUGHT)

R. H. McNaught reports his discovery of a diffuse comet on CCD
images obtained with the 0.5-m Uppsala Schmidt telescope (discovery
observation tabulated below, obtained in poor seeing). In improved
seeing on Oct. 5.4, McNaught found the diffuse coma to have a
diameter of about 12". Following posting on the 'NEOCP' webpage
and an identification of the object by B. G. Marsden in Uppsala
Schmidt astrometry from Sept. 11.5 UT, McNaught re-examined those
images and noted the comet to be similar in appearance (comet's
image about 1".5 larger than images of stars of similar brightness).
G. Sostero, Povoletto, Italy, reports that sixteen stacked
unfiltered CCD exposures taken by E. Guido, L. Donato, V. Gonano,
and himself remotedly with a 0.15-m refractor located at the Tzec
Maun Observatory (near Moorook, Australia) on Oct. 5.6 show a coma
nearly 7" in diameter with a central condensation and a broad, fan-
shaped tail about 12" long toward p.a. 310 deg. S. Foglia writes
that CCD images obtained remotely on Oct. 5.6 by L. Buzzi, P.
Concari, G. Galli, M. Tombelli, and himself with a 0.18-m reflector
(also at the Tzec Maun Observatory) show the object diffuse to be
diffuse. H. Sato (Ota-ku, Tokyo, Japan) notes that his CCD images
obtained remotely with a 0.30-m reflector from the RAS Observatory
(also near Moorook) on Oct. 5.7 show a 10" coma with no tail.

2010 UT R.A. (2000) Decl. Mag. Observer
Oct. 4.56629 22 47 00.76 -34 37 39.3 18.8 McNaught

The available astrometry, the following preliminary elliptical
orbital elements by Marsden, and an ephemeris appear on MPEC
2010-T27.

T = 2010 Nov. 24.294 TT Peri. = 226.899
e = 0.32329 Node = 129.708 2000.0
q = 3.18597 AU Incl. = 32.148
a = 4.70800 AU n = 0.096483 P = 10.22 years


COMET 103P/HARTLEY

Visual total-magnitude and coma-diameter estimates: Sept.
8.90 UT, 9.5, 7' (B. H. Granslo, Malm, Norway, 0.05-m refractor);
15.00, 8.5, 15' (J. J. Gonzalez, Leon, Spain, 10x50 binoculars);
29.82, 7.7, 15' (G. Pappa, Mascalucia, Italy, 12x50 binoculars);
Oct. 2.86, 6.4, 25' (J. J. Gonzalez, Cantabria, Spain, 4x30
monocular); 5.21, 7.2, 24' (C. S. Morris, Fillmore, CA, U.S.A.,
10x50 binoculars).

2010 October 5 (9172) Daniel W. E. Green
Модератор Астрономического Форума ASTROTALK
Аватара пользователя
Tikhon
Модератор форума
 
Сообщения: 2802
Зарегистрирован: 20 окт 2008, 18:54

Re: IAU Circulars (IAUCs) - циркуляры МАС - 10/2010

Сообщение Tikhon » 07 дек 2010, 16:06

16 October 2010
IAU Circular No.9173


COMET P/2010 T2 (PANSTARRS)

Richard Wainscoat reports the discovery of a comet (discovery
observation tabulated below) with a coma diameter of approximately
4" on 45-s CCD images taken with the 1.8-m Ritchey-Chretien "Pan-
STARRS 1" telescope (+ w filter; bandpass 400-700 nm) at Haleakala.
Wainscoat noticed the object to be diffuse (the non-stellar nature
of the object being rather subtle) two days ago when examining
images of moving objects identified by the Pan-STARRS Moving Object
Processing System. Wainscoat and M. Micheli then located the
object in images acquired by the same telescope with a g-band
filter on Oct. 7 UT, and the object was noted to be also diffuse in
those images. Following posting on the Minor Planet Center's
'NEOCP' webpage, R. S. McMillan, University of Arizona, reports
that R-band CCD observations were obtained on Oct. 16.4 UT by J. V.
Scotti, M. Terenzoni, and A. J. Mendez with the 2.3-m f/3
Spacewatch reflector at Kitt Peak (and measured by J. A. Larsen),
showing a slightly diffuse coma of diameter 4" (in 2" seeing), the
magnitude given as 19.5-19.6.

2010 UT R.A. (2000) Decl. Mag.
Oct. 6.43000 1 07 26.26 - 1 02 02.6 21.4

The available astrometry, the following preliminary elliptical
orbital elements by G. V. Williams, and an ephemeris appear on MPEC
2010-U07.

T = 2011 July 29.179 TT Peri. = 359.450
e = 0.33281 Node = 59.268 2000.0
q = 3.72938 AU Incl. = 8.077
a = 5.58968 AU n = 0.074580 P = 13.2 years


COMETS C/1999 D2, C/1999 D3, C/1999 O5, C/1999 Q4 (SOHO)

Further to IAUC 9171, additional Kreutz sungrazers have been
found on SOHO website images; K. Battams notes that all were
stellar in appearance with no tails. C/1999 D2 and C/1999 Q4
peaked at mag approximately 7; C/1999 D3 and C/1999 O5 peaked at
mag approximately 7.5.

Comet 1999 UT R.A.(2000)Decl. Inst. F MPEC
C/1999 D2 Feb. 27.888 22 55.9 - 8 58 C3 MK 2010-O33
C/1999 D3 28.238 22 55.5 - 9 16 C3 MK 2010-O33
C/1999 O5 July 26.179 8 07.3 +18 01 C3 JR 2010-O33
C/1999 Q4 Aug. 25.138 9 54.7 + 9 59 C3 JR 2010-O33

2010 October 16 (9173) Daniel W. E. Green
Модератор Астрономического Форума ASTROTALK
Аватара пользователя
Tikhon
Модератор форума
 
Сообщения: 2802
Зарегистрирован: 20 окт 2008, 18:54

Re: IAU Circulars (IAUCs) - циркуляры МАС - 10/2010

Сообщение Tikhon » 07 дек 2010, 16:07

18 October 2010
IAU Circular No.9174


COMET P/2010 U1 (BOATTINI)

A. Boattini reports his discovery of a comet on CCD images
taken with the Mt. Lemmon 1.5-m reflector (discovery observation
tabulated below); he notes a very strong condensation with a coma
about 4" wide and a very narrow, well-defined tail 50" long in p.a.
240-245 deg. Following posting on the 'NEOCP', R. S. McMillan
reports that CCD mosaic images taken with the 0.9-m Spacewatch
reflector on Oct. 17.4 and 18.4 UT show a faint tail 8" and 10"
long (respectively) in p.a. 250 deg.

2010 UT R.A. (2000) Decl. Mag. Observer
Oct. 17.23352 1 48 47.91 +21 34 11.2 19.3 Boattini

The available astrometry (including prediscovery La Sagra Sky
Survey observations from Oct. 1), preliminary elliptical orbital
elements T = 2010 May 15.407 TT, e = 0.26662, q = 4.88416 AU,
Peri. = 93.794 deg, Node = 281.247 deg, i = 8.234 deg, equinox
2000.0, P = 17.2 years), and an ephemeris appear on MPEC 2010-U18.


COMET P/2010 U2 (HILL)

R. E. Hill reports his discovery of a comet on Catalina 0.68-m
Schmidt telescope CCD images (discovery observation tabulated below);
co-added images show a diffuse nucleus with a 1"-2" coma and a thin
tail about 15"-20" long in p.a. 240 deg. Following posting on the
'NEOCP', other CCD astrometrists have reported on the object's
cometary appearance on Oct. 18 UT, including H. Sato (0.30-m
reflector; diffuse 10" coma); E. Guido, G. Sostero, V. Gonano, and L.
Donato (0.25-m reflector; slightly diffuse); L. Buzzi and S. Foglia
(0.36-m reflector; faint tail); P. Miller, P. Roche, A. Tripp, and S.
Foglia (2.0-m reflector; round 8" coma); and R. Ligustri (0.25-m
reflector; coma diameter about 10"-15");

2010 UT R.A. (2000) Decl. Mag. Observer
Oct. 17.31577 2 06 43.63 +30 14 15.5 18.2 Hill

The available astrometry (including prediscovery La Sagra Sky
Survey observations from Oct. 1 and Catalina observations from
Oct. 9), preliminary elliptical orbital elements (T = 2010 Nov.
9.746 TT, e = 0.40365, q = 2.55669 AU, Peri. = 44.270 deg, Node =
357.247 deg, i = 16.910 deg, equinox 2000.0, P = 8.9 years), and
an ephemeris appear on MPEC 2010-U19.


COMET P/2010 T2 (PANSTARRS)

Corrigendum. On IAUC 9173, line 13, FOR Spacewatch READ Bok

2010 October 18 (9174) Daniel W. E. Green
Модератор Астрономического Форума ASTROTALK
Аватара пользователя
Tikhon
Модератор форума
 
Сообщения: 2802
Зарегистрирован: 20 окт 2008, 18:54

Пред.

Вернуться в Астрономическая электронная библиотека

Кто сейчас на конференции

Сейчас этот форум просматривают: нет зарегистрированных пользователей и гости: 2


cron