IAU Circulars (IAUCs) - циркуляры МАС - 08/2010

Re: IAU Circulars (IAUCs) - циркуляры МАС - 08/2010

Сообщение Tikhon » 07 дек 2010, 11:21

24 August 2010
IAU Circular No.9163


COMET P/2010 Q1 (SCOTTI)

J. V. Scotti, University of Arizona, reports the recovery of
comet P/2000 Y3 (cf. IAUCs 7552, 7553) as an essentially stellar
object on images obtained on Aug. 19 and 20 with the 0.9-m
Spacewatch reflector at Kitt Peak (first observation tabulated
below).

2010 UT R.A. (2000) Decl. Mag. Observer
Aug. 19.37705 1 57 22.03 +13 10 01.1 20.9 Scotti

The indicated correction to the prediction on MPC 65937 is Delta(T)
= -0.46 day. The astrometry (including accidental observations
obtained by T. H. Bressi on 2009 Sept. 18 with the 1.8-m Spacewatch
reflector), linked orbital elements (epoch 2012 Feb. 3.0 TT, T =
2012 Jan. 20.3218 TT, e = 0.199930, q = 3.918196 AU, Peri. =
92.5913 deg, Node = 354.1592 deg, i = 2.2591 deg, equinox 2000.0, P
= 10.84 years), residuals, and an ephemeris appear on MPEC 2010-Q19.


COMET 103P/HARTLEY

M. Knight, E. Schwieterman, and D. Schleicher, Lowell
Observatory, obtained and analyzed extensive CN narrowband images
of comet 103P on five consecutive nights (2010 Aug. 13-17) using
the Hall 1.1-m telescope at Lowell Observatory. Following the
removal of median radial profiles, an oscillating CN gas feature is
seen centered near position angle 350 deg, consistent with a side-
on cork-screw jet morphology; no dust feature other than the tail
was visible in R-band images. Intervals between 15 pairs of
matching CN images from various rotational cycles, coupled with the
spacing and the outward motion of the feature, imply a nucleus
rotation period of 16.6 +/- 0.5 hr, consistent with the result by
Meech et al. (2009, BAAS 41, 1029). Preliminary modeling suggests
a moderate obliquity of the rotation axis and a mid-latitude source
location.
Schleicher adds that he obtained six sets of narrowband
photometry of comet 103P on Aug. 11 and 12 (when r = 1.48-1.47 AU)
using the Hall 1.1-m telescope, resulting in the following averaged
production rates: log Q(OH) = 27.04; equivalent log Q(water;
vectorial) = 27.09; log Q(NH) = 24.87; log Q(CN) = 24.48; log Q(C_2)
= 24.56; log Q(C_3) = 23.86; log af(rho)(526.0 nm) = 0.93 (cf. IAUC
7342). There is possible evidence of rotational variability, with
values for CN and C_3 lower by 10 percent on Aug. 12 vs. Aug. 11,
while dust was lower by about 20 percent. The implied very-low-
dust-to-gas ratio, based on af(rho) vs. Q(OH), matches Schleicher's
measurements from the 1991 and 1997 apparitions.

2010 August 24 (9163) Daniel W. E. Green
Модератор Астрономического Форума ASTROTALK
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Tikhon
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Re: IAU Circulars (IAUCs) - циркуляры МАС - 08/2010

Сообщение Tikhon » 07 дек 2010, 11:21

30 August 2010
IAU Circular No.9164


NUMBERING OF PERIODIC COMETS

The following seven comets have been given permanent
numberings: 238P/2010 N2 = 2005 U1 (Read; cf. IAUC 9158);
239P/2010 C2 = 1999 XB_69 (LINEAR; cf. IAUC 9159); 240P/2010 P1 =
2002 X2 (NEAT; cf. IAUC 9159); 241P/2010 P2 = 1999 U3 (LINEAR;
IAUC 9160); 242P/2010 P3 = 1998 U4 (Spahr; cf. IAUC 9161);
243P/2010 P5 = 2003 S2 (NEAT; cf. IAUC 9162); 244P/2010 Q1 =
2000 Y3 (Scotti; cf. IAUC 9163).


COMETS C/2009 X3-X17 (SOHO)

Further to IAUC 9162, additional Kreutz sungrazers have been
found on SOHO website images. C/2009 X3, which was very close to
C/2009 X2 (cf. IAUC 9162), was diffuse with a short tail. C/2009
X4 was stellar in appearance (peak mag about 7-7.5). C/2009 X5 and
C/2009 X8 were very small (mag about 7.5-8). C/2009 X6 (mag about
7) and C/2009 X7 (mag about 7.5-8) were slightly diffuse. C/2009
X9 (mag about 6) was slightly diffuse with a tail. C/2009 X10 (mag
about 7.5) and C/2009 X11 (mag about 8-8.5; barely visible) were
very small. C/2009 X12 was very diffuse (peak mag about 7-7.5).
C/2009 X13 was diffuse (mag about 7). C/2009 X14 was small and
faint (mag about 8). C/2009 X15 and C/2009 X17 were diffuse (peak
mag about 7-7.5). C/2009 X16 was slightly diffuse (mag about 7).

Comet 2009 UT R.A.(2000)Decl. Inst. F MPEC
C/2009 X3 Dec. 1.779 16 29.3 -24 41 C3/2 TS 2010-M16
C/2009 X4 2.496 16 35.3 -23 46 C2 BZ 2010-M16
C/2009 X5 4.038 16 43.6 -24 04 C2 MU 2010-M16
C/2009 X6 4.579 16 46.0 -24 11 C2 JR 2010-M16
C/2009 X7 4.688 16 44.8 -24 04 C2 RK 2010-M16
C/2009 X8 6.104 16 51.2 -24 18 C2 BZ 2010-M17
C/2009 X9 6.929 16 51.3 -26 57 C3/2 AK 2010-M17
C/2009 X10 7.064 16 55.8 -24 26 C2 BZ 2010-M17
C/2009 X11 7.396 16 56.9 -24 27 C2 JR 2010-M17
C/2009 X12 8.596 17 02.1 -25 28 C3/2 MU 2010-M17
C/2009 X13 10.071 17 09.4 -25 25 C3/2 MU 2010-M18
C/2009 X14 11.038 17 14.1 -24 50 C2 JR 2010-M18
C/2009 X15 13.688 17 26.5 -25 04 C2 MK 2010-M18
C/2009 X16 13.888 17 27.5 -26 10 C3/2 MU 2010-M18
C/2009 X17 15.604 17 35.4 -25 08 C2 BZ 2010-M18

2010 August 30 (9164) Daniel W. E. Green
Модератор Астрономического Форума ASTROTALK
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Tikhon
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Зарегистрирован: 20 окт 2008, 18:54

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