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IAUC 8677: 2006ak, 2006al; 2006X, 2006ab; 174P; RS Oph

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IAUC number

                                                  Circular No. 8677
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://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)

SUPERNOVAE 2006ak AND 2006al
     Two apparent supernovae have been discovered on unfiltered CCD
images:  2006ak by N. Tyurina, V. Lipunov, V. Kornilov, A. Krylov,
G. Borisov, A. Belinski, D. Kuvshinov, E. Gorbovskoy, P. Gritsyk,
and M. Sinitsyn (MASTER robotic telescope; cf. IAUC 8603); and
2006al by R. Holmes (Charleston, IL) and H. Devore (Fayetteville,
NC) with a 0.40-m Schmidt-Cassegrain reflector.

SN      2006 UT      R.A.  (2000.0)  Decl.    Mag.     Offset
2006ak  Feb. 17.97  11 09 32.83  +28 37 50.3  15.8  6" W, 18" N
2006al  Feb. 19.32  10 39 28.26  + 5 11 00.3  16.9  3".1 W, 0".7 S

SN 2006ak is a type-Ia supernova about a week past maximum light
(cf. CBET 408).  Additional approximate magnitudes of 2006ak:  Feb.
8.99 UT, about 17.0; 18.00, 15.8.  Additional approximate
magnitudes of 2006al:  Jan. 26.29, [20.5; Feb. 21.24, 16.9 +/- 0.3.

     Unfiltered CCD survey magnitudes by Lipunov et al. for SN
2006X (cf. IAUC 8667):  Feb. 6.06 UT, 15.8; 8.96, 14.6.
     D. S. Wong, J. M. Silverman, D. Pooley, and A. V. Filippenko,
University of California, Berkeley, report that inspection of CCD
spectra (range 330-1020 nm), obtained on Feb. 22 UT with the Shane
3-m telescope at Lick Observatory, shows that SN 2006ab (IAUC 8669)
is of type Ic, about 2 weeks past maximum brightness.  The Ca II
near-infrared triplet absorption is especially strong.

     The Committee on Small Bodies Nomenclature has agreed to give
the comet P/2000 EC_98 (cf. IAUC 8656, 8660) the same name as the
centaur minor planet (60558), Echeclus (cf. MPC 55988), which has
been assigned also the permanent comet number 174P (MPC 55911).
P/2000 C1 = P/2006 A3 (Hergenrother) has been assigned the number
175P (cf. IAUC 8664).

     Corrigenda.  M. Bode advises us that the observation times
given on IAUC 8675 (lines 9 and 14 of the second item, printed
version) should read Feb. 16.00 (or 3.17 days after the reported
optical outburst) and 17.86 UT.

                      (C) Copyright 2006 CBAT
2006 February 22               (8677)            Daniel W. E. Green

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