Electronic Telegram No. 5678
Central Bureau for Astronomical Telegrams
Mailing address:  Hoffman Lab 209; Harvard University;
 20 Oxford St.; Cambridge, MA  02138; U.S.A.
e-mail:  cbatiau@eps.harvard.edu (alternate cbat@iau.org)
URL http://www.cbat.eps.harvard.edu/index.html
Prepared using the Tamkin Foundation Computer Network


COMET P/2026 B1 = P/2013 G10 = P/2018 X4 (PANSTARRS)
     Further to CBET 5659, additional astrometry from 2026 has been published 
on MPEC 2026-F280.  The new pre-numbering apparition designations P/2013 G10
and P/2018 X4 have been assigned to the previous two apparitions.  The 
following updated orbital elements by S. Nakano (Central Bureau) are from 101 
observations spanning 2006 Jan. 6-2026 Mar. 14 (mean residual 0".4), with 
corresponding non-gravitational parameters A1 = -1.82 +/- 1.62, A2 = +0.0458 
+/- 0.0518.  There are no close approaches to major planets.

                    Epoch = 2006 Mar.  6.0 TT
     T = 2006 Mar. 21.90910 TT        Peri. =  69.52175
     e = 0.3319506                    Node  = 106.95470 2000.0
     q = 2.3979129 AU                 Incl. =   4.08241
       a =  3.5894248 AU   n = 0.14493283   P =   6.80 years

                    Epoch = 2012 Dec. 19.0 TT
     T = 2012 Dec. 22.78106 TT        Peri. =  69.60087
     e = 0.3399244                    Node  = 106.67328 2000.0
     q = 2.3504374 AU                 Incl. =   4.09224
       a =  3.5608610 AU   n = 0.14668022   P =   6.72 years

                    Epoch = 2019 Oct.  4.0 TT
     T = 2019 Sept.16.70399 TT        Peri. =  69.87798
     e = 0.3400402                    Node  = 106.62526 2000.0
     q = 2.3497146 AU                 Incl. =   4.09230
       a =  3.5603907 AU   n = 0.14670928   P =   6.72 years

                    Epoch = 2026 Aug. 28.0 TT
     T = 2026 Aug. 14.73937 TT        Peri. =  72.72433
     e = 0.3140118                    Node  = 104.65952 2000.0
     q = 2.5122072 AU                 Incl. =   4.02121
       a =  3.6621726 AU   n = 0.14063579   P =   7.01 years

                    Epoch = 2033 Aug. 31.0 TT
     T = 2033 Aug. 22.40804 TT        Peri. =  72.81846
     e = 0.3120167                    Node  = 104.62070 2000.0
     q = 2.5239868 AU                 Incl. =   4.01928
       a =  3.6686745 AU   n = 0.14026209   P =   7.03 years

                    Epoch = 2040 Sept. 3.0 TT
     T = 2040 Aug. 23.77176 TT        Peri. =  72.55983
     e = 0.3139572                    Node  = 104.60607 2000.0
     q = 2.5135331 AU                 Incl. =   4.02004
       a =  3.6638140 AU   n = 0.14054130   P =   7.01 years


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

                         (C) Copyright 2026 CBAT
2026 April 1                     (CBET 5678)              Daniel W. E. Green