(CCD image taken by Seiichiro Kiyota on May 18)
(CCD image taken by Gianluca Masi on July 13)
(CCD image taken at Kyoto University, on 2001 May 17).
According to THE ASTRONOMER Electronic Circular No 1633, Mike Collins reported a variable object, located at 19h 07m 27s, +11o 44' 09" (J2000.0). The TA variable name TAV J1907+117 has been assigned.
The object was reported to be at mag 10.9 on May 11.99 UT. The object may have been at 12.1 on Apr. 25, but the measurement may have been affected by confusion. According to H. Yamaoka (Kyushu University), the nearest brightest star on DSS has an r=15.7, b=18.8, which suggests the variable is a large-amplitude one. The object is not in the IRAS source catalog, and it may be possible that the object may be some sort of eruptive object. Further detailed observations are strongly encouraged.
I reports the following prediscovery observations on my patrol films.
object YYYYMMDD(UT) mag code Aqlnova2001 20001027.416 <151p Tmz.VSOLJ Aqlnova2001 20001213.368 <131p Tmz.VSOLJ Aqlnova2001 20010216.792 <131p Tmz.VSOLJ Aqlnova2001 20010220.793 <131p Tmz.VSOLJ Aqlnova2001 20010226.792 132p Tmz.VSOLJ Aqlnova2001 20010302.796 <131p Tmz.VSOLJ> Aqlnova2001 20010318.719 130p Tmz.VSOLJ Aqlnova2001 20010321.767 127p Tmz.VSOLJ Aqlnova2001 20010326.763 127p Tmz.VSOLJ Aqlnova2001 20010331.738 127p Tmz.VSOLJ Aqlnova2001 20010411.753 131p Tmz.VSOLJ Aqlnova2001 20010419.691 127p Tmz.VSOLJ Aqlnova2001 20010422.739 129p Tmz.VSOLJ> Aqlnova2001 20010426.677 128p Tmz.VSOLJ Aqlnova2001 20010512.588 108p Tmz.VSOLJ Aqlnova2001 20010516.634 130p Tmz.VSOLJ Observer's code: Tmz: K.Takamizawa (Saku-machi,Nagano,Japan) SASS (Saku All Sky Survey) Inst.: 10cmR F4 twin patrol cameras T-Max400 120
This object is now confirmed spectrocopically as a nova. Chris Benn of the Isaac Newton Grooup of Telescopes in La Palma took a spectrum on the 4.2-m William Herschel Telescope last night in response to a appeal from Guy Hurst and confirmed that it has a classical nova spectrum. This is Mike Collin's first nova discovery.
The following article was posted to IAUC:
M. Uemura, T. Kato, Kyoto University (KU); and H. Yamaoka, Kyushu University, write: "Unfiltered CCD images of the probable nova in Aquila (IAUC 7627) were obtained with KU 0.25-m telescope on May 17.79, when the object was mag about 11.8 (calibrated with GSC system). The position measured with 15 GSC-ACT stars of the uniform epoch (1983.609) is R.A. = 19h07m28s.425, Decl. = +11d44'45".78 (equinox 2000.0, fitting error 0".3), which is in agreement with the reported position on IAUC 7627. A faint star exists on DSS (both generation, R and Bj) images within 0".5 of the above position. Its magnitude, compared with USNO_A2.0 stars, is r about 18.7 and b about 19.6."
Trondal's chart with Henden/Sumner V-magnitudes
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