Sidus Ludoviciana
| Observation data Epoch J2000.0 Equinox J2000.0 |
|
|---|---|
| Constellation | Ursa Major |
| Right ascension | 13h 24m 51.8439s |
| Declination | +54° 53′ 50.905″ |
| Apparent magnitude (V) | +7.58 |
| Characteristics | |
| Spectral type | A5 |
| Astrometry | |
| Radial velocity (Rv) | -4.9 km/s |
| Proper motion (μ) |
RA: -19.7 mas/yr Dec.: -4.7 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. It has the spectral type A8/F0 III.
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