HD 90089

HD 90089
Location of HD 90089 (circled in red)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Camelopardalis[1]
Right ascension 10h 31m 04.7079s[2]
Declination +82° 33′ 31.146″[2]
Apparent magnitude (V) 5.252±0.009[3]
Characteristics
Evolutionary stage main sequence[4]
Spectral type F4 V kF2 mF2[5]
U−B color index −0.05[6]
B−V color index +0.37[6]
Astrometry
Radial velocity (Rv)+7.9±0.9[7] km/s
Proper motion (μ) RA: −86.133[2] mas/yr
Dec.: +19.832[2] mas/yr
Parallax (π)43.4367±0.5983 mas[2]
Distance75 ± 1 ly
(23.0 ± 0.3 pc)
Absolute magnitude (MV)3.60[8]
Other designations
BD+83°297, FK5 911, GJ 392.1, HD 90089, HIP 51502, HR 4084, SAO 1714, WDS J10311+8234A
Database references
SIMBADdata

HD 90089 (HR 4084; Gliese 392.1) is a star system located in the northern circumpolar constellation Camelopardalis. With a combined apparent magnitude of 5.25,[3] it is faintly visible to the naked eye under ideal conditions. This star is located relatively close at a distance of 75 light years,[9] but is drifting away at a rate of almost 8 km/s.[7]

This is an astrometric binary system, initially indicated through Gaia astrometry, and validated in 2026 with the direct detection of the secondary component. The observed separation was of 0.024" along a position angle of 182.4°.[10] The main component of HD 90089 is an F4 main-sequence star with the calcium K-line and metallic lines of an F2 star.[5] Although the spectral type is of a form that would indicate an Am star, it is not listed in any of the major catalogues of chemically peculiar stars.[11] The secondary is only 0.45 magnitudes fainter than the primary.[10]

An infrared excess has been detected around this system, most likely indicating the presence of a circumstellar disk at a radius of 145 AU. The temperature of this dust is 30 K.[3]

In addition to the inner pair, there is an M0 companion separated 13" away[12] and at approximately the same distance.[13]

References

  1. ^ 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.
  2. ^ 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.
  3. ^ a b c Eiroa, C.; et al. (July 2013). "DUst around NEarby Stars. The survey observational results". Astronomy & Astrophysics. 555: A11. arXiv:1305.0155. Bibcode:2013A&A...555A..11E. doi:10.1051/0004-6361/201321050. S2CID 377244.
  4. ^ Just, A.; Jahrei, H. (2008). "The main sequence from F to K stars of the solar neighbourhood in SDSS colours". Astronomische Nachrichten. 329 (8): 790. arXiv:0808.2111. Bibcode:2008AN....329..790J. doi:10.1002/asna.200811030.
  5. ^ a b Gray, R. O.; Corbally, C. J.; Garrison, R. F.; McFadden, M. T.; Robinson, P. E. (October 2003). "Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 Parsecs: The Northern Sample. I." The Astronomical Journal. 126 (4): 2048–2059. arXiv:astro-ph/0308182. Bibcode:2003AJ....126.2048G. doi:10.1086/378365. ISSN 0004-6256.
  6. ^ a b Johnson, H. L.; Mitchell, R. I.; Iriarte, B.; Wisniewski, W. Z. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory. 4: 99–110. Bibcode:1966CoLPL...4...99J.
  7. ^ a b Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. ISSN 1063-7737. S2CID 119231169.
  8. ^ Reiners, Ansgar (January 2006), "Rotation- and temperature-dependence of stellar latitudinal differential rotation", Astronomy and Astrophysics, 446 (1): 267–277, arXiv:astro-ph/0509399, Bibcode:2006A&A...446..267R, doi:10.1051/0004-6361:20053911, S2CID 8642707
  9. ^ 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.
  10. ^ a b Hartman, Zachary D.; Clark, Catherine A.; Lund, Michael B.; Lester, Kathryn V.; Caballero, José A.; Howell, Steve B.; Ciardi, David; Deveny, Sarah; Everett, Mark E. (2026-01-08). "Paving the Road to the Habitable Worlds Observatory with High-Resolution Imaging I: New and Archival Speckle Observations of Potential HWO Target Stars". The Astrophysical Journal. arXiv:2601.05387.
  11. ^ Renson, P.; Manfroid, J. (May 2009). "Catalogue of Ap, HgMn and Am stars". Astronomy and Astrophysics. 498 (3): 961–966. Bibcode:2009A&A...498..961R. doi:10.1051/0004-6361/200810788.
  12. ^ Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (December 2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog". The Astronomical Journal. 122 (6): 3466–3471. Bibcode:2001AJ....122.3466M. doi:10.1086/323920. ISSN 0004-6256.
  13. ^ 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.
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