astro.wikisort.org - Star
HD 27894 is a 9th magnitude star located approximately 143 light years away in the constellation of Reticulum. It is an orange dwarf (spectral type K2V), a type dimmer and cooler than the Sun.
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Reticulum |
| Right ascension | 04h 20m 47.046106s[1] |
| Declination | −59° 24′ 39.024641″[1] |
| Apparent magnitude (V) | 9.42 |
| Characteristics | |
| Spectral type | K2 V[2] |
| U−B color index | +0.90[3] |
| B−V color index | +1.005[3] |
| Astrometry | |
| Radial velocity (Rv) | 82.74±0.15[1] km/s |
| Proper motion (μ) | RA: 182.473±0.012 mas/yr[1] Dec.: 270.012±0.017 mas/yr[1] |
| Parallax (π) | 22.8888 ± 0.0121 mas[1] |
| Distance | 142.50 ± 0.08 ly (43.69 ± 0.02 pc) |
| Details | |
| Mass | 0.86 ± 0.06[4] M☉ |
| Surface gravity (log g) | 4.54 ± 0.05[4] cgs |
| Temperature | 4920 ± 45[4] K |
| Metallicity [Fe/H] | +0.20[5] dex |
| Age | 7.7 ± 2.3[4] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
In 2005, the Geneva Extrasolar Planet Search Team announced the discovery of an extrasolar planet orbiting the star.[6] In 2017, the discovery of two additional exoplanets was announced. One is very close to the star like the one discovered earlier, while the other one orbits the star at a much larger distance. It is the first system where such a large gap between orbital distances has been found.[7][8] In 2022, the inclination and true mass of HD 27894 d were measured via astrometry. The study only found strong evidence for planets b and d.[9]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | ≥0.665+0.009 −0.007 MJ |
0.125±0.0001 | 18.02+0.01 −0.02 |
0.047+0.012 −0.008 |
— | — |
| c | ≥0.162+0.011 −0.040 MJ |
0.198±0.001 | 36.07+0.26 −0.09 |
0.015+0.020 −0.002 |
— | — |
| d | 6.493+0.987 −0.353 MJ |
5.362+0.206 −0.223 |
5019.5+32.6 −31.1 |
0.343+0.031 −0.026 |
101.524+14.742 −31.503° |
— |
See also
- List of extrasolar planets
References
- Vallenari, A.; et al. (Gaia Collaboration) (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. arXiv:2208.00211. doi:10.1051/0004-6361/202243940. Gaia DR3 record for this source at VizieR.
- Houk, Nancy (1979). Michigan catalogue of two-dimensional spectral types for the HD stars. Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan. Bibcode:1978mcts.book.....H. LCCN 78010745.
- "LTT 1953 -- High proper-motion Star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2012-02-05
- Trevisan, M.; et al. (November 2011), "Analysis of old very metal rich stars in the solar neighbourhood", Astronomy & Astrophysics, 535: A42, arXiv:1109.6304, Bibcode:2011A&A...535A..42T, doi:10.1051/0004-6361/201016056, S2CID 49565866. See table 13.
- Sousa, S. G.; et al. (August 2008), "Spectroscopic parameters for 451 stars in the HARPS GTO planet search program. Stellar [Fe/H] and the frequency of exo-Neptunes", Astronomy and Astrophysics, 487 (1): 373–381, arXiv:0805.4826, Bibcode:2008A&A...487..373S, doi:10.1051/0004-6361:200809698, S2CID 18173201
- Moutou, C.; et al. (2005). "The HARPS search for southern extra-solar planets IV. Three close-in planets around HD 2638, HD 27894 and HD 63454". Astronomy and Astrophysics. 439 (1): 367–373. Bibcode:2005A&A...439..367M. doi:10.1051/0004-6361:20052826.
- Trifonov, T.; Kürster, M.; Zechmeister, M.; Zakhozhay, O. V.; Reffert, S.; Lee, M. H.; Rodler, F.; Vogt, S. S.; Brems, S. S. (2017). "Three planets around HD 27894. A close-in pair with a 2:1 period ratio and an eccentric Jovian planet at 5.4 AU". Astronomy & Astrophysics. 602: L8. arXiv:1706.00509. Bibcode:2017A&A...602L...8T. doi:10.1051/0004-6361/201731044. S2CID 119105619.
- Tomasz Nowakowski (June 12, 2017). "Two new massive planets detected around the star HD 27894". Retrieved June 12, 2017.
- Feng, Fabo; Butler, R. Paul; et al. (August 2022). "3D Selection of 167 Substellar Companions to Nearby Stars". The Astrophysical Journal Supplement Series. 262 (21). arXiv:2208.12720. Bibcode:2022arXiv220812720F. doi:10.3847/1538-4365/ac7e57.
External links
Constellation of Reticulum | |||||||||||
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На других языках
[de] HD 27894
HD 27894 ist ein etwa 143 Lichtjahre entfernter Hauptreihenstern der Spektralklasse K2 im Sternbild Reticulum (Netz). Er besitzt eine scheinbare Helligkeit von 9,4 mag. Der Stern wird von einem Exoplaneten mit einer Umlaufperiode von rund 18 Tagen umrundet.- [en] HD 27894
[ru] HD 27894
HD 27894 — звезда в созвездии Сетки. Находится на расстоянии около 138 световых лет от Солнца. Вокруг звезды обращаются, как минимум, три планеты.Текст в блоке "Читать" взят с сайта "Википедия" и доступен по лицензии Creative Commons Attribution-ShareAlike; в отдельных случаях могут действовать дополнительные условия.
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