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IAUC 8995: P/2008 T3 = 1892 T1; C/2008 R3

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IAUC number 

                                                  Circular No. 8995
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
CBAT@CFA.HARVARD.EDU (science)
URL http://www.cfa.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)


COMET P/2008 T3 = 1892 T1 (BARNARD-BOATTINI)
     Following a suggestion by M. Meyer (Limburg, Germany) that
comet P/2008 T3 (cf. IAUC 8993) may be identical to the long-lost
comet D/1892 T1 = 1892e = 1892 V (Barnard), G. V. Williams
(Smithsonian Astrophysical Observatory) has collected 41
astrometric observations from the literature in 1892 and re-reduced
them for analysis.  The resulting orbital calculations by Williams
and by S. Nakano (Sumoto, Japan) confirm the identity.  Nakano
notes that the comet made 20 revolutions between 1892 and 2008,
passing about 0.3-0.4 AU of Jupiter in 1922 Oct., 1934 Aug., and
2005 Aug.  The following orbital elements are by Williams, from 90
observations spanning 1892 Oct. 16-2008 Oct. 8 (22 of which are
from 1892; mean residual 1".4):

                    Epoch = 1892 Dec.  8.0 TT
     T = 1892 Dec. 11.2241 TT         Peri. = 170.0322
     e = 0.588534                     Node  = 208.0355  2000.0
     q = 1.431937 AU                  Incl. =  31.2616
       a =  3.480083 AU    n = 0.1518167    P =   6.492 years

                    Epoch = 2008 Oct. 21.0 TT
     T = 2008 Oct. 25.0966 TT         Peri. = 181.4238
     e = 0.646433                     Node  = 204.1371  2000.0
     q = 1.145243 AU                  Incl. =  32.9309
       a =  3.239112 AU    n = 0.1690695    P =   5.830 years

     G. Sostero, E. Guido, and P. Camilleri report that sixteen
60-s remotely acquired unfiltered CCD images obtained with a 35-cm
reflector at Trunkey, N.S.W., on Oct. 8.4 UT show a compact coma
about 8" in diameter and a tail about 15" long in p.a. 255 deg.


COMET C/2008 R3 (LINEAR)
     Elliptical orbital elements for this comet (cf. IAUC 8973)
from MPEC 2008-T97:

     T = 2008 Nov. 22.467 TT          Peri. =  84.139
     e = 0.89537                      Node  = 270.568   2000.0
     q = 1.90883 AU                   Incl. =  43.238
       a = 18.24389 AU     n = 0.012648     P =  77.92 years

                      (C) Copyright 2008 CBAT
2008 October 8                 (8995)            Daniel W. E. Green

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