HR Lyrae

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Double star
HR Lyrae
AladinLite
Observation
dates equinox :  J2000.0 , epoch : J2000.0
Constellation lyre
Right ascension 18 h 53 m 25.06 s
declination + 29 ° 13 ′ 37.7 ″
Apparent brightness 15.4 mag
Typing
rel. Brightness
(G-band) 		(15.82 ± 0.01) mag
rel. Brightness
(J-band) 		(15.06 ± 0.04) mag
Variable star type N / A 
Astrometry
parallax (0.18 ± 0.03)  mas
Proper movement 
Rec. Share: (−1.93 ± 0.06)  mas / a
Dec. portion: (-7.62 ± 0.06)  mas / a
Physical Properties
Other names
and catalog entries
Henry Draper Catalog HD 175268 [1]
2MASS catalog 2MASS J18532505 + 2913377 [2]
Other names Nova Lyrae 1919, AAVSO 1849 + 29, AN 1.1920, HV 3521

Template: Infobox star / maintenance / magGTemplate: Infobox star / maintenance / magJ

HR Lyrae also Nova Lyr 1919 was a medium-speed nova of the NA type, which was recorded on December 6, 1919 in the constellation Lyra with an apparent magnitude of 6.5 m by Joanna C. S. Mackie during her systematic search for novas in the Milky Way on photos from Harvard College observatory was discovered.

Depending on the method used, the decrease in brightness was between 31 and 97 days. The amplitude was at least 9.5. Based on the available values, the absolute brightness is set to a maximum of −6.9 m to −7.2 m (± 1.1 m ) and a minimum of +2.3 m to +2.6 m (± 1, 1 m ) estimated.

The star shows an active resting phase with fluctuations in brightness on different time scales. Visual observations over a ten-year period also reveal long periods of time when the star was between 15.4 and 15.7 magnitudes. Some features indicate that it could also be a recurrent nova.

Individual evidence

  1. ↑ a b c d e f HR Lyr. In: SIMBAD . Center de Données astronomiques de Strasbourg , accessed on March 26, 2019 .
  2. ↑ HR Lyr. In: VSX. AAVSO , accessed March 26, 2019 .
  3. ^ Bailey, SI: A New Star . In: Popular Astronomy, Vol. 28, 1920, p.134 . 1920. bibcode : 1920PA ..... 28..134B .
  4. ↑ HR Lyrae (Nova Lyr 1919): from outburst to active quiescence. In: Cornell University. January 25, 2007, accessed March 17, 2019 .