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"Listed below is BV photometry (from an unpublished source) for four stars close to NGC 3198, which should prove useful no matter what type of variable the new candidate turns out to be.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

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