MethN3198
La Supernova 1999bw dans Ngc 3198
Tableau des Mesures et Courbe de Lumière
Voir l'image de Philippe DUPOUY (Observatoire de DAX) : S99bwDU1
Éléments Indispensables pour le suivi
de la SN 1999bw
Extraits de la circulaire
"IAUC" 7149 :SUPERNOVA 1999bw IN NGC 3198
W. D. Li, University of California at Berkeley, on behalf of the Lick
Observatory Supernova Search (cf. IAUC 6627, 7126),reports the discovery on
unfiltered CCD images taken on Apr. 20.2 UT with the 0.8-m Katzman Automatic
Imaging Telescope (KAIT) of a variable star (mag about 17.8) near NGC 3198.
Inspection of earlier images taken by KAIT reveals that the object was clearly
present on Apr. 15.2 (mag about 18.4) and 19.2 (mag about 18.0). The new object
is located at R.A. = 10h19m46s.81, Decl. = +45o31'35".0 (equinox 2000.0),
which is about 85".8 west and 83".8 south of the nucleus of NGC 3198.
KAIT images of the same field on Apr. 3.2 (limiting mag about 17.5), Mar. 29.2
(limiting mag about
17.5), and Mar. 24.2 (limiting mag about 19.0) showed nothing at the position
of the new object. SN 1966J, one of the prototype-Ib supernovae, also occurred
in NGC 3198 and had a peak magnitude of B
= 11.2.
Etoiles photométriques près de Ngc 3198
BRIAN SKIFF a publié sur la liste "VSNET" ce message :
"Listed below is BV photometry (from an unpublished source) for four
stars close to NGC 3198, which should prove useful no matter what type of
variable the new candidate turns out to be. These are extracted from my large
photometric reference file. In the last column I give R magnitudes derived
directly from the BV data, which should be reliable to within a few hundredths
of a magnitude.
\Brian
Name RA (2000) Dec s GSC V B-V R
NGC 3198 1 10 20 00.5 +45 36 31 G 3435-0470 11.92 0.63 (11.56)
NGC 3198 2 10 19 49.2 +45 38 53 G 3435-0832 12.63 1.03 (12.07)
NGC 3198 4 10 19 50.5 +45 28 22 G 3435-0513 15.04 0.62 (14.69)
NGC 3198 3 10 19 55.8 +45 30 19 A 15.07 0.49 (14.78) "
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Carte de Champ de Ngc 3198 avec localisation des quatre étoiles ci-dessus référencées