La SN1999gk dans Ngc 4653

Tableau des mesures et Courbe de Lumière

Extrait de la circulaire IAUC 7332

"SUPERNOVA 1999gk IN NGC 4653
S. Jha, P. Garnavich, P. Challis, and R. Kirshner, Harvard-Smithsonian Center for Astrophysics, report the serendipitous
discovery by P. Berlind of a supernova in NGC 4653, during the course of spectroscopic observations with the F. L. Whipple
Observatory (FLWO) 1.5-m telescope (+ FAST spectrograph). A spectrum of SN 1999gk, taken by Berlind on Dec. 15.53 UT, shows it
to be a type-II supernova just after maximum light. The spectrum exhibits a blue continuum with strong P-Cyg Balmer lines and Fe II
absorption. The H-alpha profile is quite peculiar, with the P-Cyg absorption showing two minima at expansion velocites of 16 100 and
8300 km/s, perhaps implying an asymmetric expansion and the possibility of strong polarization. Superimposed narrow H-alpha
emission yields a recession velocity of 2490 km/s for the host galaxy. Concurrent images, taken by C. Hergenrother with the FLWO
1.2-m telescope (+ 4Shooter), yield a precise position for the supernova of R.A. = 12h43m51s.91, Decl. = -0o32'55".4 (equinox
2000.0), which is 45".6 north and 15".3 east of the host galaxy, and magnitudes for the supernova V = 15.7 and R = 15.8.
Coincidentally, the supernova is in the Landolt standard star field SA104.


Suivi en images de la SN1999dk dans Ngc 4653

Consulter la liste des Observateurs





S99gkCH1 000110


S99gkBR1 000103


S99gkCH2 20000225.039 


S99gkPO1 20000304.973


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