Central Bureau for Astronomical Telegrams
IAUC 7812: 2002 C1; V838 Mon = PECULIAR Var IN Mon
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Circular No. 7812
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)
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Phone 617-495-7440/7244/7444 (for emergency use only)
COMET 2002 C1
Word has been received of the independent visual discovery of
a comet by Kaoru Ikeya (Mori, Shuchi, Shizuoka, Japan; 0.25-m
reflector, 39x; communicated by S. Nakano, Sumoto, Japan; coma
diameter 2' with weak condensation; motion about 5' northeastward
in 30 min) and by Daqing Zhang (near Kaifeng, Henan province,
China; 0.2-m reflector; communicated by J. Zhu, Peking University;
coma diameter 3').
2002 UT R.A. (2000) Decl. m1 Observer
Feb. 1.408 0 08.9 -17 42 9.0 Ikeya
1.47 0 09 -17 30 8.5 Zhang
V838 MONOCEROTIS = PECULIAR VARIABLE IN MONOCEROS
N. N. Samus, Institute of Astronomy, Moscow, informs us that
the designation V838 Mon has been given to this unusual variable
star (cf. IAUC 7786, 7789, 7791, 7796).
T. Zwitter, Department of Physics, University of Ljubljana;
and U. Munari, Padova and Asiago Astronomical Observatories, report
on CCD echelle spectroscopic observations (range 460-930 nm,
resolution 18 000) of V838 Mon obtained on Jan. 26.0 UT with the
Asiago 1.82-m telescope. The spectrum is that of a heavily
reddened cool giant K-type star at heliocentric velocity +53 km/s.
Deep P-Cyg profiles mark the Ca II triplet at 849-866 nm, S I
(869.3 and 675.7 nm), Si I (614.2 nm), Na I (589.0 and 589.6 nm),
Ca I (650.0, 585.7, and 527.0 nm), Ni I (677.2 nm), Y II (566.3
nm), Zr II (611.5 nm), and C I (661.1 and 667.2 nm), as well as
many Cr I, Gd II, Fe I, and Ti I (but not Ba II) lines. The
average terminal heliocentric absorption velocity in the P-Cyg
profile is -458 km/s, and the minimum is at -252 km/s. H-alpha
appears as a narrow absorption at +54 km/s (FWHM 41 km/s,
equivalent width 0.064 nm), superimposed on a marginal emission at
+72 km/s. Interstellar Na I and K I lines have two components at
+47 and +73 km/s with component intensities corresponding to E(B-V)
= 0.56 and 0.24, respectively, using the calibration of Munari and
Zwitter (1997, A.Ap. 318, 269). The total extinction E(B-V) = 0.80
is confirmed by the 0.029-nm equivalent width of the diffuse
interstellar band at 862.1 nm. The reddening suggests a distance >
3 kpc, judging from extinction maps of Neckel and Klare (1980,
A.Ap. Suppl. 42, 251).
(C) Copyright 2002 CBAT
2002 February 1 (7812) Daniel W. E. Green
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