Dwarf nova
Videos
A dwarf nova, or U Geminorum variable, is one of several types of cataclysmic variable star, consisting of a close binary star system in which one of the components is a white dwarf that accretes matt
Dwarf nova HT Cas seen in outburst (mag ~13.4) on November 2, 2010
Light curve of eclipsing dwarf nova HT Cassiopeiae during outburst, showing eclipses and superhumps (SU Ursae Majoris type)
Canis Minor
Videos
Canis Minor is a small constellation in the northern celestial hemisphere. In the second century, it was included as an asterism, or pattern, of two stars in Ptolemy's 48 constellations, and it is cou
Canis Minor, as depicted by Johann Bode in his 1801 work Uranographia
The constellation Canis Minor can be seen alongside Monoceros and the obsolete constellation Atelier Typographique in this 1825 star chart from Urania's Mirror.
The constellation Canis Minor as it can be seen by the naked eye
The constellation Canis Minor showing the IAU boundaries, the constellation stick figure, and labels for its brightest stars. Astrophotograph by Eckhard Slawik, from NOIRLab's 88 Constellations project.