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IAUC 8930: COMET P/2006 B7 (ODAS); S/2008 (41) 1; 196P; STEREO SPACECRAFT

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IAUC number

                                                  Circular No. 8930
Central Bureau for Astronomical Telegrams
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
URL http://www.cfa.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)

COMET P/2006 B7 (ODAS)
     Further to IAUC 8929, orbital elements for the comet's last

                    Epoch = 2005 Apr. 20.0 TT
     T = 2005 May   3.1936 TT         Peri. =  69.1455
     e = 0.447143                     Node  = 358.6275  2000.0
     q = 1.980985 AU                  Incl. =   1.3516
       a =  3.583176 AU    n = 0.1453121    P =   6.78 years

S/2008 (41) 1
     A. R. Conrad, W. M. Keck Observatory (WMKO); W. J. Merline,
Southwest Research Institute (SwRI); J. D. Drummond, Starfire
Optical Range, Air Force Research Laboratory, Kirtland Air Force
Base; P. M. Tamblyn, Binary Astronomy, Dillon, CO, and SwRI; C.
Dumas, European Southern Observatory (ESO), Chile; B. X. Carry,
ESO; R. D. Campbell and R. W. Goodrich, WMKO; W. M. Owen, Jet
Propulsion Laboratory; and C. R. Chapman, SwRI, report the
discovery on Mar. 28.5 UT of a satellite of minor planet (41)
Daphne from more than 100 J-, H-, K-, and K'-band images with the
10-m Keck II telescope (+ NIRC2/AO adaptive-optics system) on Mauna
Kea.  On Mar. 28.5032, the satellite was at separation 0".56
(projected separation 443 km) and position angle 277 deg.  The
satellite was observed to be moving with the primary, as they
traveled 80" across the background sky over the 3 hours.  The
significant (0".3) orbital motion of the satellite observed during
this time implies an orbital period near 1.6 days.  The H-band
brightness ratio is estimated at about 10 mag, giving an estimated
diameter of the satellite of < 2 km; if so, this system has the
most extreme size ratio known (cf. EMP 2008, p. 256).

     Comet P/2008 C2 = 2000 U6 (cf. IAUC 8917) has been assigned
the number 196P (cf. MPC 61921), and comet P/2008 E2 = 2003 KV_2
(cf. IAUCs 8924, 8925) has been assigned the number 197P (cf. MPC

     Clarifying IAUC 8926, the two STEREO spacecraft will be 45 deg
from the earth in its orbit about two years after launch, and
continue to drift away from the earth (ultimately passing each
other behind the sun).

                      (C) Copyright 2008 CBAT
2008 March 31                  (8930)            Daniel W. E. Green

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