Astronomy:31 Crateris
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Corvus[2] |
| Right ascension | 12h 00m 51.15916s[3] |
| Declination | −19° 39′ 32.3322″[3] |
| Apparent magnitude (V) | 5.19-5.23[4] |
| Characteristics | |
| Spectral type | B1.5V + ?[5] |
| Variable type | Eclipsing binary[4] |
| Astrometry | |
| Radial velocity (Rv) | 1.7±2[6] km/s |
| Proper motion (μ) | RA: −17.071[3] mas/yr Dec.: +6.830[3] mas/yr |
| Parallax (π) | 1.6891 ± 0.1525[3] mas |
| Distance | 1,900 ± 200 ly (590 ± 50 pc) |
| Absolute magnitude (MV) | −2.71[7] |
| Details | |
| Mass | 11.0[8] M☉ |
| Luminosity | 13,900[8] L☉ |
| Temperature | 23,442[8] K |
| Other designations | |
| Database references | |
| SIMBAD | data |
31 Crateris is a binary star system in the constellation Corvus. Varying between apparent magnitudes 5.19 and 5.23 over 1.48 days, it has the variable star designation of TY Corvi.[4] It is actually a remote system with a hot blue-white star of spectral type B1.5V and a companion about which little is known. The two stars orbit each other every 2.9631 days. The primary is possibly a blue straggler of the Hyades group.[5] The primary is around 11 times as massive as the Sun and 13,900 times as luminous.[8]
Johann Elert Bode designated this star Mu Crateris in his 1801 Uranographia, but this is now no longer used.[10]
British astronomer John Flamsteed numbered the stars in an expanded constellation he termed Hydra and Crater, which included the stars of Hydra immediately below the Cup. Published in 1712, this was not followed by later astronomers. 31 Crateris ended up in the constellation Corvus after formal boundaries were set in 1922.[11]
On 27 March 1974, the Mariner 10 mission detected emissions in the far ultraviolet. These were initially thought to be Mercury's moon before the source was shown to be 31 Crateris.[12][13]
References
- ↑ "/ftp/cats/more/HIP/cdroms/cats". Strasbourg astronomical Data Center. https://cdsarc.cds.unistra.fr/viz-bin/ftp-index?/ftp/cats/more/HIP/cdroms/cats.
- ↑ Roman, Nancy G. (1987). "Identification of a constellation from a position". Publications of the Astronomical Society of the Pacific 99 (617): 695. doi:10.1086/132034. Bibcode: 1987PASP...99..695R Constellation record for this object at VizieR.
- ↑ 3.0 3.1 3.2 3.3 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940 Gaia DR3 record for this source at VizieR.
- ↑ 4.0 4.1 4.2 Watson, Christopher (4 January 2010). "TY Corvi". The International Variable Star Index. American Association of Variable Star Observers. http://www.aavso.org/vsx/index.php?view=detail.top&oid=10702.
- ↑ 5.0 5.1 Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society 389 (2): 869–879, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E.
- ↑ Wilson, Ralph Elmer (1953). "General catalogue of stellar radial velocities". Carnegie Institute Washington D.C. Publication. Bibcode: 1953GCRV..C......0W.
- ↑ Melnik, A. M.; Dambis, A. K. (2020). "Distance scale for high-luminosity stars in OB associations and in field with Gaia DR2. Spurious systematic motions". Astrophysics and Space Science 365 (7): 112. doi:10.1007/s10509-020-03827-0. Bibcode: 2020Ap&SS.365..112M.
- ↑ 8.0 8.1 8.2 8.3 Quintana, Alexis L.; Wright, Nicholas J.; Martínez García, Juan (2025). "A census of OB stars within 1 KPC and the star formation and core collapse supernova rates of the Milky Way". Monthly Notices of the Royal Astronomical Society 538 (3): 1367. doi:10.1093/mnras/staf083. Bibcode: 2025MNRAS.538.1367Q.
- ↑ "31 Crateris". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=31+Crateris.
- ↑ E-Rara.ch, 2026, https://www.e-rara.ch/zut/content/zoom/3341803
- ↑ Wagman, Morton (2003). Lost Stars: Lost, Missing and Troublesome Stars from the Catalogues of Johannes Bayer, Nicholas Louis de Lacaille, John Flamsteed, and Sundry Others. Blacksburg, Virginia: The McDonald & Woodward Publishing Company. pp. 390–91. ISBN 978-0-939923-78-6.
- ↑ Moore, Patrick (2000). The Data Book of Astronomy. CRC Press. pp. 79. ISBN 9781420033441. https://books.google.com/books?id=fDDpBwAAQBAJ&q=moon+mercury+%2231+Crateris%22&pg=PA79.
- ↑ Stratford, R.L. (1980). "31 Crateris reexamined". The Observatory 100: 168. Bibcode: 1980Obs...100..168S.
 |  |
