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IAUC 7779: 11D; 2001if NEAR MCG +06-6-43

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                                                  Circular No. 7779
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://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)


COMET 11D (TEMPEL-SWIFT) = P/2001 X3 (LINEAR)
     C. Hergenrother, Lunar and Planetary Laboratory; and K.
Muraoka, Kochi, Japan, suggested a link between comet 11D (last
seen in 1908) and P/2001 X3 (cf. IAUC 7778) -- a linkage confirmed
at the Minor Planet Center and by S. Nakano (Sumoto, Japan).  The
orbital elements below are by Nakano (from 43 observations,
1908-2001, mean residual 0".8; nongravitational parameters A_1 =
+0.13 +/- 0.01, A_2 = -0.0134 +/- 0.0007).  The comet was not found
in 1963 despite a prediction by B. G. Marsden (IAUC 1838, 1839,
1840).  More recent predictions were made by Marsden and Sekanina
(1971, A.J. 76, 1142), by Nakano (Comet Handbooks for 1989, 1995,
and 1996, Oriental Astronomical Association; and NK 686), and by
Muraoka (Comet Handbook for 2001, OAA).  The indicated correction
to Nakano's 2001 prediction (1998, NK 686) is Delta(T) = +3.4 days.

                    Epoch = 2002 Jan.  6.0 TT
     T = 2001 Dec. 30.75519 TT        Peri. = 163.63401
     e = 0.5391227                    Node  = 240.71112 2000.0
     q = 1.5840469 AU                 Incl. =  13.46049
       a =  3.4370255 AU   n = 0.15467850   P =   6.372 years

                    Epoch = 1908 Sept.16.0 TT
     T = 1908 Oct.  5.07032 TT        Peri. = 113.40868
     e = 0.6381330                    Node  = 291.84116 2000.0
     q = 1.1524985 AU                 Incl. =   5.44909
       a =  3.1848677 AU   n = 0.17340714   P =   5.684 years


SUPERNOVA 2001if NEAR MCG +06-6-43
     S. Benetti, G. Altavilla, A. Pastorello, M. Turatto, S.
Desidera, E. Giro, C. Pernechele and A. Bortolussi, Osservatorio
Astronomico di Padova; and E. Cappellaro, Osservatorio Astronomico
di Capodimonte, write:  "A spectrum (range 400-780 nm, resolution
2.5 nm) of SN 2001if (cf. IAUC 7771), obtained on Dec. 19.87 UT
with the Asiago 1.82-m telescope (+ AFOSC), shows it to be a
type-Ia supernova 15 +/- 5 days after maximum light.  The SN
spectral features and age are consistent with those of a type-Ia
supernova having a photospheric expansion velocity of about 9000
km/s (deduced from the Si II 635.5-nm feauture) at a recession
velocity of about 11 400 km/s.  Thus, SN 2001if belongs to the MCG
+06-6-43 cluster, even if the SN is not clearly associated with any
galaxy of the field."

                      (C) Copyright 2001 CBAT
2001 December 20               (7779)            Daniel W. E. Green

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