HD 90089

HD 90089
Location of HD 90089 (circled in red)
Observation data
Epoch J2000.0      Equinox ICRS
Constellation Camelopardalis
A
Right ascension 10h 31m 04.7079s
Declination +82° 33′ 31.146″
Apparent magnitude (V) 5.252±0.009
B
Right ascension 10h 31m 11.7789s
Declination +82° 33′ 32.222″
Characteristics
A
Evolutionary stage main sequence
Spectral type F4 V kF2 mF2
U−B color index −0.05
B−V color index +0.37
Astrometry
A
Radial velocity (Rv)+7.9±0.9 km/s
Proper motion (μ) RA: −86.133 mas/yr
Dec.: +19.832 mas/yr
Parallax (π)43.4367±0.5983 mas
Distance75 ± 1 ly
(23.0 ± 0.3 pc)
B
Proper motion (μ) RA: −105.469 mas/yr
Dec.: +37.093 mas/yr
Parallax (π)44.2131±0.0184 mas
Distance73.77 ± 0.03 ly
(22.618 ± 0.009 pc)
Details
Aa
Mass1.32 M☉
Radius1.29 R☉
Luminosity3.35 L☉
Surface gravity (log g)4.39 cgs
Temperature6,831 K
Ab
Mass0.24 M☉
B
Mass0.275±0.008 M☉
Radius0.298±0.008 R☉
Luminosity0.00807±0.00025 L☉
Surface gravity (log g)4.90 cgs
Temperature3,255±108 K
Other designations
A: BD+83°297, FK5 911, GJ 392.1, HD 90089, HIP 51502, HR 4084, SAO 1714, WDS J10311+8234A
Database references
SIMBADA
B

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, it is faintly visible to the naked eye under ideal conditions. This star is located relatively close at a distance of 75 light years, but is drifting away at a rate of almost 8 km/s.

Characteristics

The two innermost components form 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°. The main component of HD 90089, component Aa, is an F4 main-sequence star with the calcium K-line and metallic lines of an F2 star. 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. The secondary, component Ab, is only 0.45 magnitudes fainter than the primary at infrared wavelengths.

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

In addition to the inner pair, there is an M0 companion separated by 14.1" from the inner pair. It was confirmed to be a physical companion in 2018, and is named component B.

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. 1 2 3 4 5 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. 1 2 3 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. 1 2 3 4 5 6 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.
  5. ↑ 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.
  6. 1 2 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.
  7. 1 2 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.
  8. 1 2 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.
  9. 1 2 Tokovinin, Andrei (2018). "The Updated Multiple Star Catalog". The Astrophysical Journal Supplement Series. 235 (1): 6. arXiv:1712.04750. Bibcode:2018ApJS..235....6T. doi:10.3847/1538-4365/aaa1a5.
  10. 1 2 3 Stassun, Keivan G.; et al. (2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal. 158 (4): 138. arXiv:1905.10694. Bibcode:2019AJ....158..138S. doi:10.3847/1538-3881/ab3467.
  11. 1 2 3 4 5 Hardegree-Ullman, Kevin K.; Apai, Dániel; Bergsten, Galen J.; Pascucci, Ilaria; López-Morales, Mercedes (June 2023). "Bioverse: A Comprehensive Assessment of the Capabilities of Extremely Large Telescopes to Probe Earth-like O2 Levels in Nearby Transiting Habitable-zone Exoplanets". The Astronomical Journal. 165 (6): 267. arXiv:2304.12490. Bibcode:2023AJ....165..267H. doi:10.3847/1538-3881/acd1ec. ISSN 0004-6256.
  12. ↑ 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.
  13. 1 2 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.
  14. ↑ 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.
  15. ↑ 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.
  16. ↑ Fuhrmann, Klaus; Chini, Rolf (2018-06-01). "Nearby Gaia DR2 Companions". Research Notes of the AAS. 2 (2): 56. Bibcode:2018RNAAS...2...56F. doi:10.3847/2515-5172/aacc72. ISSN 2515-5172.