HJ 2814
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Serpens[1][2] |
| A | |
| Right ascension | 17h 56m 19.0355s[3] |
| Declination | −15° 48′ 45.101″[3] |
| Apparent magnitude (V) | 5.929±0.010[4] |
| B | |
| Right ascension | 17h 56m 19.6077s[5] |
| Declination | −15° 49′ 04.114″[5] |
| Apparent magnitude (V) | 8.89[6] |
| Characteristics | |
| Aa1 | |
| Spectral type | A0V[7] |
| B | |
| Spectral type | G0V[6] |
| Astrometry | |
| A | |
| Radial velocity (Rv) | −24±10[8] km/s |
| Proper motion (μ) | RA: −1.602 mas/yr[3] Dec.: −72.684 mas/yr[3] |
| Parallax (π) | 12.7459±0.0976 mas[3] |
| Distance | 256 ± 2 ly (78.5 ± 0.6 pc) |
| B | |
| Radial velocity (Rv) | −9.2±0.3[6] km/s |
| Proper motion (μ) | RA: −4.831 mas/yr[5] Dec.: −65.535 mas/yr[5] |
| Parallax (π) | 12.3775±0.0403 mas[9] |
| Distance | 263.5 ± 0.9 ly (80.8 ± 0.3 pc) |
| Orbit[10] | |
| Primary | Aa1 |
| Companion | Aa2 |
| Period (P) | 13.4191±0.0003 days |
| Semi-major axis (a) | 0.16±0.01 au |
| Eccentricity (e) | 0.36±0.02 |
| Inclination (i) | 151+12 −17° |
| Longitude of the node (Ω) | 306.3±5.8° |
| Argument of periastron (ω) (secondary) | 252.3±4.7° |
| Semi-amplitude (K1) (primary) | 36.7±2.8 km/s |
| Orbit[10] | |
| Primary | Aa |
| Companion | Ab |
| Period (P) | 69.5+7.3 −6.8 yr |
| Semi-major axis (a) | 26.5±1.9 au |
| Eccentricity (e) | 0.29±0.03 |
| Inclination (i) | 106.5±1.4° |
| Longitude of the node (Ω) | 322±2° |
| Periastron epoch (T) | 1996.7±1.1 |
| Orbit[6] | |
| Primary | Ba |
| Companion | Bb |
| Period (P) | 728.96±0.79 days |
| Semi-major axis (a) | 0.761±0.008 au[9] |
| Eccentricity (e) | 0.500±0.038 |
| Inclination (i) | 133.1±0.5[9]° |
| Periastron epoch (T) | 53759.4±9.11 JD |
| Argument of periastron (ω) (secondary) | 135.3±1.1° |
| Semi-amplitude (K1) (primary) | 10.4±0.8 km/s |
| Semi-amplitude (K2) (secondary) | 16.3±1.9 km/s |
| Details[10] | |
| Aa1 | |
| Mass | 2.03 M☉ |
| Radius | 1.93 R☉ |
| Luminosity | 23.8±1.8[11] L☉ |
| Temperature | 8,873 K |
| Age | 400 Myr |
| Aa2 | |
| Mass | 0.85 M☉ |
| Radius | 0.76 R☉ |
| Temperature | 5,115 K |
| Age | 400 Myr |
| Ab | |
| Mass | 0.77 M☉ |
| Radius | 0.70 R☉ |
| Temperature | 4,722 K |
| Age | 400 Myr |
| Ba | |
| Mass | 0.94±0.06[9] M☉ |
| Bb | |
| Mass | 0.66±0.03[9] M☉ |
| Other designations | |
| HJ 2814, ADS 10891, CCDM J17563-1549, WDS J17563-1549[12] | |
| A: BD−15 4722, HD 163336, HIP 87813, HR 6681, SAO 160915, TIC 210131774, TYC 6250-386-1[12] | |
| B: BD−15 4723, SAO 160916, TIC 210141857, TYC 6250-558-1[13] | |
| Database references | |
| SIMBAD | A |
| B | |
HJ 2814 (WDS J17563-1549) is a five-star system within the Serpens constellation.
Properties
[edit]The quintuple system HJ 2814 is arranged in two subsystems: The triple system HIP 87813 (HJ 2814 A) and the binary HJ 2814 B. Those subsystems are separated by 1,600 astronomical units, and the orbital period is an estimated 26,000 years.[10]
HIP 87813 comprises an inner binary system (Aa, with components Aa1 and Aa2) and an outer third star (Ab), which orbits the inner pair. The stars Aa1 and Aa2 are separated by 0.16 au and take 13.4 days to complete an orbit. Aa1 is an A-type main-sequence star with 2.03 times the mass of the Sun and 1.93 times the Sun's radius, while Aa2 is smaller, at 0.85 times the mass and 0.76 times the radius of the Sun. Component Ab is separated by 27 au from the inner pair and takes 70 years to complete an orbit. It has 0.77 times the mass and 0.70 times the Sun's radius. The Aa1-Aa2 pair has a close separation and can only be resolved by interferometry, while Aa-Ab are detectable with adaptive optics. Star Ab was also detected indirectly via astrometry, hence HIP 87813 is an astrometric binary.[10] The apparent magnitude of HIP 87813 is 5.929,[4] faintly visible to the naked eye only under ideal conditions, in dark skies.
HJ 2814 B is a pair of stars orbiting each other at an orbital period of 729 days (2.00 years).[6] They are separated by a semi-major axis of 0.76 au[9] and have a moderate eccentricity of 0.5.[6] The components are named (HJ 2814) Ba and Bb, with masses of 0.94 and 0.66 times solar, respectively.[9] The combined spectrum appears to be G0V.[6]
Parallax measurements of the component A by the Gaia spacecraft indicate a distance of 256 light-years (78 parsecs).[3] While the parallax listed in the Gaia database for component B is unreliable,[5] a dynamical parallax indicates a distance of 263.5 light-years (80.8 parsecs).[9]
References
[edit]- ^ Roman, Nancy G. (1987). "Identification of a constellation from a position". Publications of the Astronomical Society of the Pacific. 99 (617): 695. Bibcode:1987PASP...99..695R. doi:10.1086/132034. Constellation record for this object at VizieR.
- ^ Roman, Nancy G. (1987). "Identification of a constellation from a position". Publications of the Astronomical Society of the Pacific. 99 (617): 695. Bibcode:1987PASP...99..695R. doi:10.1086/132034. Constellation record for this object at VizieR.
- ^ a b c d e Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
- ^ a b 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 – L30. Bibcode:2000A&A...355L..27H. ISSN 0004-6361.
- ^ a b c d Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
- ^ a b c d e f g Tokovinin, Andrei (November 2019). "Spectroscopic Orbits of Subsystems in Multiple Stars. VI". The Astronomical Journal. 158 (6): 222. arXiv:1910.04143. Bibcode:2019AJ....158..222T. doi:10.3847/1538-3881/ab4c94. ISSN 1538-3881.
- ^ Houk, N.; Smith-Moore, M. (1988). "Michigan Catalogue of Two-dimensional Spectral Types for the HD Stars. Volume 4, Declinations -26°.0 to -12°.0". Michigan Catalogue of Two-dimensional Spectral Types for the HD Stars. Volume 4. 4. Bibcode:1988mcts.book.....H.
- ^ Kharchenko, N.v.; Scholz, R.-D.; Piskunov, A.e.; Röser, S.; Schilbach, E. (2007). "Astrophysical supplements to the ASCC-2.5: Ia. Radial velocities of ∼55000 stars and mean radial velocities of 516 Galactic open clusters and associations". Astronomische Nachrichten. 328 (9): 889–896. arXiv:0705.0878. Bibcode:2007AN....328..889K. doi:10.1002/asna.200710776. ISSN 1521-3994.
- ^ a b c d e f g h Chevalier, S.; Babusiaux, C.; Merle, T.; Arenou, F. (October 2023). "Binary masses and luminosities with Gaia DR3". Astronomy and Astrophysics. 678: A19. arXiv:2307.16719. Bibcode:2023A&A...678A..19C. doi:10.1051/0004-6361/202347111. ISSN 0004-6361.
- ^ a b c d e Waisberg, Idel; Klein, Ygal; Katz, Boaz (June 2023). "Binarity and beyond in A stars II. Disentangling the four stars in the vicinity of the triple HIP 87813 within the quintuple system HJ2814". Monthly Notices of the Royal Astronomical Society. 521 (4): 5255–5271. arXiv:2204.08493. Bibcode:2023MNRAS.521.5255W. doi:10.1093/mnras/stad873. ISSN 0035-8711.
- ^ Zorec, J.; Royer, F. (January 2012). "Rotational velocities of A-type stars - IV. Evolution of rotational velocities =". Astronomy & Astrophysics. 537: A120. arXiv:1201.2052. Bibcode:2012A&A...537A.120Z. doi:10.1051/0004-6361/201117691. ISSN 0004-6361.
- ^ a b "HIP 87813". SIMBAD. Centre de données astronomiques de Strasbourg.
- ^ "TIC 210141857". SIMBAD. Centre de données astronomiques de Strasbourg.
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