Central Bureau for Astronomical Telegrams
IAUC 5498: 1992g; Var OBJECT NEAR NGC 4192
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Read IAUC 5499
Circular No. 5498
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Telephone 617-495-7244/7440/7444 (for emergency use only)
TWX 710-320-6842 ASTROGRAM CAM EASYLINK 62794505
MARSDEN@CFA or GREEN@CFA (.SPAN, .BITNET or .HARVARD.EDU)
PERIODIC COMET MUELLER 4 (1992g)
Ephemeris from the orbital elements on IAUC 5497:
1992 TT R. A. (2000) Decl. Delta r Elong. Phase m1
Apr. 8 14 13.76 +27 37.0 1.808 2.667 141.7 13.5 17.0
13 14 11.27 +28 26.0 1.818 2.673 141.0 13.7 17.1
18 14 08.59 +29 06.3 1.834 2.680 139.6 14.1 17.1
23 14 05.84 +29 37.5 1.855 2.687 137.8 14.6 17.1
28 14 03.12 +29 59.1 1.881 2.694 135.6 15.2 17.2
May 3 14 00.54 +30 11.3 1.911 2.702 133.0 15.8 17.2
8 13 58.20 +30 14.2 1.946 2.710 130.3 16.5 17.3
13 13 56.20 +30 08.2 1.984 2.718 127.3 17.2 17.3
18 13 54.58 +29 54.1 2.026 2.727 124.3 17.8 17.4
VARIABLE OBJECT NEAR NGC 4192
M. Hamuy, Cerro Tololo Interamerican Observatory; and J. Maza,
University of Chile, report the discovery by M. Wischnjewsky of a
variable object located about 19" east and 22" north of the nucleus of
the spiral galaxy NGC 4192 (R.A. = 12h11m15s, Decl. = +15d10'.8,
equinox 1950.0). This object was found at mpg about 19 on a 20-min
unfiltered IIa-O plate taken by R. Antezana with the Curtis Schmidt on
Apr. 9.155 UT. The object is not present (mpg [ 20) on a previous
unfiltered IIa-O plate taken with the same telescope by L. Wells on
Apr. 3. Confirmation was made by Y.-C. Kim from B and V CCD images
obtained with the CTIO 0.9-m telescope, preliminary reductions
yielding: Apr. 12.2 UT, V = 18.45; 13.16, V = 18.8, B-V = +1.2. A
low-dispersion spectrum (range 300-720 nm), obtained on Apr. 13.2 by J.
Baldwin with the CTIO 4-m telescope, shows narrow H-alpha and N II
658.5 nm in emission, as well as two unidentified emissions at 419.0
nm and 700.3 nm. An absorption at 393.3 nm, presumably due to Ca II,
is also present. If the object is in NGC 4192, and assuming a
distance modulus of 31.3 (Capaccioli et al. 1990, Ap.J. 350, 110) for
the Virgo cluster, it would have an absolute visual magnitude of
-12.85 on Apr. 12.2; this would correspond to a bright nova or a faint
supernova. However, given the small radial velocity of NGC 4192 (-250
km/s) and the low resolution of the spectrum, it is not possible to
distinguish between a member of NGC 4192 and a foreground galactic
flare star.
1992 April 15 (5498) Brian G. Marsden
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