Skip to main content

Special Notice #165: Dwarf nova-like outburst of the old nova X Ser

AAVSO Special Notice #165

Dwarf nova-like outburst of the old nova X Ser
August 17, 2009

T. Kato reports in vsnet-alert 11397 that the Catalina Sky Survey has detected a dwarf nova-like outburst in the old nova X Ser (N Ser 1903). Catalina reports this star was at magnitude 14.18 on JD 2455059.94 (2009 August 16.44).  The AAVSO observational record for this star is sparse, with fewer than 20 observations in the International Database. However, the star was reported to be at similar magnitudes in the past (14.0, JD 2449603.6, J. Nordby, Moorhead, Minnesota; 14.1, JD 2450359.3, M. Fonovich, Plomin, Croatia; see also Honeycutt, Robertson, and Turner, 1998, Astronomical Journal 115, 2527).

Observations of X Ser are strongly encouraged to fully cover the current outburst.  We also encourage more long-term monitoring of X Ser to better constrain its long-term behavior.  Both visual monitoring and instrumental photometry are needed.

X Ser is located at the following (J2000) coordinates:

RA: 16 19 17.7 , Dec: -02 29 29

Customized charts for X Ser may be generated using AAVSO VSP:

Please submit observations to the AAVSO using the name "X Ser".

This AAVSO Special Notice was prepared by M. Templeton.

Information on submitting observations to the AAVSO may be found at:


A Special Notice archive is available at the following URL:

Subscribing and Unsubscribing may be done at the following URL:


AAVSO 49 Bay State Rd. Cambridge, MA 02138 617-354-0484