Skip to main content

Web Publications

AAVSO Special Notice #117: Superoutburst of the infrequently outbursting dwarf nova HO Del (revised) AAVSO HOME > publications > special notice

AAVSO Special Notice #117

Superoutburst of the infrequently outbursting dwarf nova HO Del (revised)
August 4, 2008

[Note: the text of this Special Notice has been revised to correct
the origin of the initial report on this outburst.  This AAVSO
Special Notice replaces #116.  We regret the error in citation.]

As reported on the CVNET website ( on 2008 August 3,
the infrequently outbursting dwarf nova HO Del was observed in 
superoutburst by Hubert Hautecler on JD 2454681.5 and subsequently
confirmed by Martin Nicholson.  This is the first time this star 
has been observed in superoutburst since 2001.  Observations
submitted to the AAVSO indicate the star is currently near 
m(vis) ~ 14.7 (Gary Poyner, JD 2454682.485), and likely went into 
outburst some time between JD 2454680.43 (Eddy Muyllaert, 
m(vis) < 14.4) and JD 2454681.49 (Hubert Hautecler, m(vis) = 14.2).

Kato et al (2003; PASJ 55, 989) showed that this star has several 
peculiarities among the SU UMa stars, including: peculiar superhump
behavior; a low outburst amplitude relative to other long 
recurrence-time SU UMa stars; and a high X-ray luminosity.  
Visual observations and instrumental time-series photometry 
of HO Del are encouraged.

HO Del is located at RA: 20 36 55.50 , Dec: +14 03 10.0 (J2000)

Charts and sequence photometry for HO Del are available via VSP:

Please submit data to the AAVSO as "HO Del" (AUID 000-BCL-980).

This AAVSO Special Notice was prepared by Matthew 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