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Special Notice #105: Possible Nova in Sgr [V5579 Sgr]

April 19, 2008

The CBAT Unconfirmed Observations Page listed a possible nova in Sgr [V5579 Sgr].  After a call on VSNET-ALERT, Ernesto Guido and Giovanni Sostero (Remanzacco Observatory) used a robotic telescope near Mayhill, NM to confirm the new object (VSNET-ALERT 10077). They provide accurate coordinates (using UCAC2) as:

18:05:58.90 -27:13:56.3 J2000

No magnitude is given by Guido and Sostero, but the original discovery magnitude was 8.4C on 20080418. No star close to this position is seen in the USNO-B nor 2MASS catalogs.  Kato (VSNET-ALERT 10075) indicates that this new outbursting object has a pre-discovery observation by ASAS: 20080416.3048 11.671V  (ASAS (Pojmanski, G. 2002, Acta Astron. 52,397)) but was not visible 3 days earlier.

While we recommend following this new nova as long as possible, please note that the field is near the galactic center and very crowded.  As the nova fades, it will be difficult to measure. We expect to get a photometric calibration as weather permits at SRO.

Arne Henden
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