Sidus Ludoviciana
 | This article relies largely or entirely on a single source. (December 2015) |
 | You can help expand this article with text translated from the corresponding article in German. (June 2011) Click [show] for important translation instructions.
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| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Ursa Major |
| Right ascension | 13h 24m 51.8439s[1] |
| Declination | +54° 53′ 50.905″[1] |
| Apparent magnitude (V) | +7.58[2] |
| Characteristics | |
| Spectral type | A5[1] |
| Astrometry | |
| Radial velocity (Rv) | -4.9[2] km/s |
| Proper motion (μ) | RA: -19.7[2] mas/yr Dec.: -4.7[2] mas/yr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Sidus Ludoviciana is an 8th-magnitude star in the asterism of the Big Dipper in the constellation Ursa Major, halfway between Mizar and Alcor. It was discovered on 2 December 1722 by Johann Georg Liebknecht, who mistook it for a planet and named it after Louis V, Landgrave of Hesse-Darmstadt. A line-of-sight companion with Mizar and Alcor (with a spectral type similar to the latter), it is roughly five times more distant.[3] It has the spectral type A8/F0 III.[4]
References
- ^ a b c Hog, E. (1998). "The Tycho Reference Catalogue". Astronomy and Astrophysics. 335. Bibcode:1998A&A...335L..65H.
- ^ a b c d "Stella Ludoviciana". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 26 December 2016.
- ^ "A New View Of Mizar". Retrieved 2016-10-03.
- ^ Grenier, S.; Baylac, M.-O.; Rolland, L.; Burnage, R.; Arenou, F.; Briot, D.; Delmas, F.; Duflot, M.; Genty, V.; Gómez, A. E.; Halbwachs, J.-L.; Marouard, M.; Oblak, E.; Sellier, A. (1999). "Radial velocities. Measurements of 2800 B2-F5 stars for HIPPARCOS". Astronomy and Astrophysics Supplement. 137 (3): 451. Bibcode:1999A&AS..137..451G. doi:10.1051/aas:1999489.
External links
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