SN 2011is (A.R. 14 01 47.16, Dec. +09 29 48.8) scoperta il 21 novembre 2011 nella galassia NGC5409 (offset 16E 24N), magnitudine 16.0, tipo Ia.
SN scoperta da M. Migliardi con il telescopio SC da 11" dell'Osservatorio del Col Drusciè (Cortina d'Ampezzo).
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
CBAT Director: Daniel W. E. Green; Hoffman Lab 209; Harvard University;
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SUPERNOVA 2011is IN NGC 5409 = PSN J14014714+0929488
Alessandro Dimai, Cortina d'Ampezzo, Italy, on behalf of the Italian
Supernovae Search Project (ISSP), reports the discovery by Merco Migliardi of
an apparent supernova on unfiltered CCD images (limiting mag about 18.0) taken
with the "Maioni" 0.28-m telescope of the Col Drusci Observatory on Nov.
21.178 (when the new object was at mag about 17.0) and 22.209 UT (at mag about
16.5). The variable is located at R.A. = 14h01m47s.00, Decl. = +09d29'50".1
(equinox 2000.0), which is 16" east and 24" north of the nucleus of NGC 5409.
Nothing is visible at this position on Palomar Sky Survey infrared, red, and
blue plates. The variable was designated PSN J14014716+0929488 when it was
posted at the Central Bureau's TOCP webpage and is here designated SN 2011is
based on the spectroscopic confirmation reported below. Additional CCD
magnitudes for 2011is (unfiltered unless noted otherwise): Apr. 9, [19.5
(ISSP, via Dimai); Nov. 23.515, 17.4 (Joseph Brimacombe, Cairns, Australia;
remotely using a 51-cm RCOS telescope + STL11K camera + luminance filter at
the New Mexico Skies Observatory near Mayhill, New Mexico; position end
figures 46s.99, 50".9; his image is posted at the following website URL:
http://www.flickr.com/photos/43846774@N02/6391358701/); 25.211, 17.0 (Federica
Luppi and Luca Buzzi, Varese, Italy; 0.38-m f/6.8 reflector; position end
figures 46s.92, 50".8; reference stars from the NOMAD catalogue; image posted
at website URL http://www.astrogeo.va.it/pub/TOCP/PSN_N5409.jpg); 27.20, 16.6
(Dimai).
L. Tomasella, A. Pastorello, S. Valenti, and S. Benetti, Istituto
Nazionale di Astrofisica, Osservatorio Astronomico di Padova, on behalf of a
larger collaboration, report that a spectrogram of PSN J14014714+0929488 =
SN 2011is, obtained on Nov. 28.23 UT with the Asiago 1.82-m Copernico Telescope
(+ AFOSC; range 350-820 nm, resolution 2.4 nm), shows iT to be a type-Ia
supernova. The best fit to this spectrum found by GELATO (Harutyunyan et al.
2008, A.Ap. 488, 383; available at URL https://gelato.tng.iac.es/login.cgi)
suggests that 2011is is a type-Ia supernova about 50 days after maximum light,
adopting for the host galaxy a redshift of z = 0.02088 (Beers et al. 1995, A.J.
109, 874; via NED).
NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
superseded by text appearing later in the printed IAU Circulars.
(C) Copyright 2011 CBAT
2011 December 4 (CBET 2935) Daniel W. E. Green