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IAUC 9164: NUMBERING OF PERIODIC COMETS; C/2009 X3-X17

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IAUC number 

                                                  Circular No. 9164
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
CBAT Director:  D. W. E. Green, Room 209; Department of
 Earth and Planetary Sciences; Harvard University;
 20 Oxford St.; Cambridge, MA  02138; U.S.A.
CBAT@IAU.ORG; CBATIAU@EPS.HARVARD.EDU
URL http://www.cfa.harvard.edu/iau/cbat.html  ISSN 0081-0304


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

                      (C) Copyright 2010 CBAT
2010 August 30                 (9164)            Daniel W. E. Green

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