Alert Notice 491: V556 Serpentis = Nova Ser 2013 = PNV J18090346-1112345

December 2, 2013

Event: V556 Serpentis = Nova Ser 2013 = PNV J18090346-1112345

Discovered by: Koichi Itagaki (Teppo-cho, Yamagata, Japan), reported by S. Nakano (Sumoto, Japan)

Discovery magnitude: unfiltered CCD magnitude mag 12.3, using a 0.21-m reflector

Discovery date: 2013 Nov. 24.384 UT

Coordinates: R.A. 18 09 03.46  Decl. -11 12 34.5  (2000.0)

Spectra: Spectra obtained by U. Munari (Astronomical Observatory of Padova, INAF) and P. Valisa (ANS Collaboration) on Nov. 25.792 UT, and by R. Itoh, Y. Kanda, Y. Moritani, and K. S. Kawabata (Hiroshima University) on Nov. 25.37 show the variable to be a reddened classical nova past maximum. Spectroscopy details may be found in CBET 3724.

Charts: Charts for V556 Ser may be created using the AAVSO Variable Star Plotter (VSP) at

Observations reported to the AAVSO: No observations of V556 Ser have been reported directly to the AAVSO to date. Observations reported via CBET 3724/IAUC 9264 include:
2013 Nov. 6.375 UT, <15 (Itagaki);
22.370, <13 (T. Kojima, Tsumagoi, Gunma-ken, Japan);
23.361, <13 (Kojima);
26.369, 11.7 (Itagaki, confirming observation);
26.373, 12.7 (Kojima, confirming observation);

Submit observations: Please submit observations to the AAVSO International Database using the name V556 SER.

a. Announced on IAU CBAT Central Bureau Electronic Telegram 3724 (Daniel W. E. Green, ed.) and IAU Circular 9264 (Green, ed.); all information in this Alert Notice except for observations reported directly to the AAVSO comes from those publications.

b. The object was designated PNV J18090346-1112345 when it was posted on the Central Bureau's TOCP webpage (

c. Itagaki posted his discovery image at

d. P. Schmeer (Bischmisheim, Germany) notes that an apparent star (H = 20.9) in the UKIDSS near-infrared Galactic Plane Survey has position end figures 03.433s, 34.39".

e. E. V. Kazarovets reports that Nova Ser 2013 was given the permanent GCVS name V556 Ser.

Congratulations to Itagaki-san on his latest discovery!

This AAVSO Alert Notice was prepared by Elizabeth O. Waagen.


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