Sidus Ludoviciana
Sidus Ludoviciana /ˈsaɪdəs ˌljuːdoʊˌvɪsiˈeɪnə/ is an 8th-magnitude giant 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 four times more distant. It has the spectral type A8/F0 III.[3]
 Location of Sidus Ludoviciana between Alcor and Mizar | |
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Ursa Major |
| Right ascension | 13h 24m 51.8516s[1] |
| Declination | +54° 53′ 50.839″[1] |
| Apparent magnitude (V) | +7.58[2] |
| Characteristics | |
| Spectral type | A8/F0III[3] |
| Astrometry | |
| Radial velocity (Rv) | −4.9[3] km/s |
| Proper motion (μ) | RA: −19.910[1] mas/yr Dec.: −5.202[1] mas/yr |
| Parallax (π) | 10.8536 ± 0.0280[1] mas |
| Distance | 300.5 ± 0.8 ly (92.1 ± 0.2 pc) |
| Details | |
| Radius | 1.61[1] R☉ |
| Luminosity | 6.159[1] L☉ |
| Temperature | 7,167[1] K |
| Other designations | |
| Database references | |
| SIMBAD | data |
The star is six times more luminous than the Sun, 1.6 times its radius, and has an surface temperature of 7,167 K. It has exhausted its core hydrogen and evolved away from the main sequence.
References
- Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27. Bibcode:2000A&A...355L..27H.
- 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" (PDF). Astronomy and Astrophysics Supplement. 137 (3): 451. Bibcode:1999A&AS..137..451G. doi:10.1051/aas:1999489.
External links
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