Sziasztok!

Van egy fényes szupernóva az NGC 3972-ben: SN 2011by.
A fényessége 14,2 magnitudó volt a felfedezéskor, de a színképfelvételek
alapján kb. 10 nappal a maximum előtt van, tehát még fényesedhet.

Ahogy nézem, egész könnyű helyen van, a gamma UMa közelében, a Z UMa-tól
néhány fokkal délre.

Jó észlelést!

* * *

AAVSO Alert Notice 438

Supernova 2011by: bright Type Ia supernova
April 28, 2011

Supernova 2011by in NGC 3972 = PSN J11554556+5519338



Discovered by: Zhangwei Jin, Ningbo, Zhejiang, China, and Xing Gao,
Urumqi, Xinjiang, China


Discovery Date: Apr. 26.8234 UT


Discovery Magnitude: approximately 14.2 using a Celestron C14
Schmidt-Cassegrain telescope (+ unfiltered CCD camera) at Mt.
Nanshan


Position: R.A. = 11:55:45.56  Decl. = +55:19:33.8 (equinox 2000.0)
SN 2011at is about 5.3" east and 19.1" north of the center of
NGC 3972.


Spectra: Spectra obtained on 2011 Apr. 27.5 UT with the 2.16-m
telescope (+ BFOSC) at the Xinglong Station of the NAOCT by T. Zhang
and Z. Zhou, National Astronomical Observatories of China (NAOC),
and X. Wang, Tsinghua Center for Astrophysics, Tsinghua University,
show SN 2011by to be a type-Ia supernova at a very early phase, about
10 days before maximum.


Charts: Finder charts for SN 2011by (AUID 000-BKB-410) may be plotted
by entering the name or the coordinates above into VSP:
http://www.aavso.org/vsp


Reporting Observations: Please report all observations to the AAVSO
as SN 2011by.

Notes:
a. Initially announced in Central Bureau for Electronic Telegrams
2708 (Daniel W. E. Green, ed.). All information in this Alert Notice
comes from CBET 2708.

b. According to Green, the object was designated PSN J11554556+5519338
when posted on the Central Bureau´s Transient Objects Confirmation
Page (TOCP) webpage, and was designated SN 2011by based on
spectroscopic reports.

c. Nothing was visible down to magnitude 19.5 at this position on
images taken by Zhangwei Jin and Xing Gao on Apr. 8 and 10, or on
a Digitized Sky Survey image from 1991 May 7 down to 19.5 (plate
type or bandpass not reported).

d. Discovery image by Zhangwei Jin and Xing Gao posted at the
following website URL:  http://www.xjltp.com/XOSS/XM20ZJ/XM20ZJ.htm.

e. Unfiltered CCD images obtained remotely by Joseph Brimacombe,
Cairns, Australia, using a 51-cm RCOS telescope (+ STL11K camera) at
the New Mexico Skies Observatory near Mayhill, New Mexico, on Apr.
27.332 UT yield magnitude 14.5 and position end figures
45.57s, 33.9"; image posted at website URL
http://www.flickr.com/photos/43846774@N02/5661036373/.

Congratulations to Zhangwei Jin and Xing Gao on their discovery!

This AAVSO Alert Notice was compiled by Elizabeth O. Waagen.
----- End forwarded message -----

--
Fidusz (FIDRICH Robert)
drotlevel:fidusz@zpok.hu
#jabber/gtalk: fidusz@jabber.hu
#skype: fidusz