Astronomy:HIP 85605

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Short description: Star of uncertain spectral type in the constellation Hercules
HIP 85605
Observation data
Equinox J2000.0]] (ICRS)
Constellation Hercules[1]
Right ascension  17h 29m 36.278s[2]
Declination +24° 39′ 11.01″[2]
Apparent magnitude (V) 11.03[3]
Characteristics
Evolutionary stage red giant branch[2]
Spectral type K4V[4]
B−V color index 1.14[5]
J−H color index 0.526[6]
J−K color index 0.646[6]
Astrometry
Radial velocity (Rv)−21.30±0.16[2] km/s
Proper motion (μ) RA: +4.837±0.008[2] mas/yr
Dec.: −8.718±0.011[2] mas/yr
Parallax (π)1.8860 ± 0.0111[2] mas
Distance1,730 ± 10 ly
(530 ± 3 pc)
Details
Mass1.2[7] M☉
Radius5.7[8] R☉
Luminosity15.8±0.5[8] L☉
Surface gravity (log g)2.97[7] cgs
Temperature4,812±96[8] K
Other designations
2MASS J17293627+2439111, TYC 2079-1800-1, WDS J17296+2439B[9]
Database references
SIMBADdata

HIP 85605 is a star in the constellation Hercules with a visual apparent magnitude of 11.03. It was once thought to be a M dwarf or K-type main-sequence star[10][11] and a possible companion of the brighter star HIP 85607, but they are now known to be an optical double. Both objects are red giants[8] separated by a greater distance than the original measurements indicated: HIP 85605 is 1,730±10 light years away while HIP 85607 is 1,323±13 light years away.[12]

Distance estimation

The original Hipparcos parallax measurement in 1997 was 202 mas, which would have placed it 16.1 light-years from the Solar System.[13] In 2007, van Leeuwen revised the number to 147 mas (0.147 arcseconds), or 22.2 light-years.[14] With this new value, HIP 85605 would have been unlikely to be one of the 100 closest star systems to the Sun.[15] In 2014, it was estimated that HIP 85605 could approach to about 0.13 to 0.65 light-years (0.04 to 0.2 pc) from the Sun within 240,000 to 470,000 years, assuming the then-known parallax and distance measurements to the object were correct.[10][16][17] In that case its gravitational influence could have disrupted the orbits of comets in the Oort cloud and caused some of them to enter the inner Solar System.

With the release of Gaia DR2, it was determined that HIP 85605 is actually a much more distant 1,790±30 light-years away and will not be passing remotely close to the Sun at any point in time.[18]

See also

References

  1. ↑ 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.
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 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.
  3. ↑ Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P. et al. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics 355. Bibcode: 2000A&A...355L..27H. 
  4. ↑ Pickles, A.; Depagne, É. (2010). "All-Sky Spectrally Matched UBVRI - ZY and u‧ g‧ r‧ i‧ z‧ Magnitudes for Stars in the Tycho2 Catalog". Publications of the Astronomical Society of the Pacific 122 (898): 1437. doi:10.1086/657947. Bibcode: 2010PASP..122.1437P. 
  5. ↑ Høg, E. et al. (February 2000). "The Tycho-2 Catalogue of the 2.5 Million Brightest Stars". Astronomy and Astrophysics 355 (1): L27–L30. Bibcode: 2000A&A...355L..27H. 
  6. ↑ 6.0 6.1 Cutri, Roc M.; Skrutskie, Michael F.; Van Dyk, Schuyler D.; Beichman, Charles A.; Carpenter, John M.; Chester, Thomas; Cambresy, Laurent; Evans, Tracey E. et al. (2003). "VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)". CDS/ADC Collection of Electronic Catalogues 2246: II/246. Bibcode: 2003yCat.2246....0C. 
  7. ↑ 7.0 7.1 Khalatyan, A.; Anders, F.; Chiappini, C.; Queiroz, A. B. A.; Nepal, S.; Dal Ponte, M.; Jordi, C.; Guiglion, G. et al. (2024). "Transferring spectroscopic stellar labels to 217 million Gaia DR3 XP stars with SHBoost". Astronomy and Astrophysics 691: A98. doi:10.1051/0004-6361/202451427. Bibcode: 2024A&A...691A..98K. 
  8. ↑ 8.0 8.1 8.2 8.3 Hon, M.; Huber, D.; Kuszlewicz, J.S.; Stello, D.; Sharma, S.; Tayar, J.; Zinn, J.C.; Vrard, M. et al. (2023). "Oscillating red giants from the TESS QLP". VizieR On-line Data Catalog. doi:10.26093/CDS/VIZIER.19190131. Bibcode: 2023yCat..19190131H. 
  9. ↑ "HIP 85605". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HIP+85605. 
  10. ↑ 10.0 10.1 Coryn A.L. Bailer-Jones (2015). "Close encounters of the stellar kind". Astronomy & Astrophysics 575: A35. doi:10.1051/0004-6361/201425221. Bibcode: 2014yCat..35750035B. 
  11. ↑ Mamajek, Eric (2015-01-03). "Reason to Doubt the Hipparcos Distance and the Close Flyby Scenario for the "Rogue Star" HIP 85605". Figshare. doi:10.6084/m9.figshare.1284334. https://doi.org/10.6084/m9.figshare.1284334.v1. 
  12. ↑ 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.
  13. ↑ Perryman, M. A. C.; Lindegren, L.; Kovalevsky, J.; Hoeg, E.; Bastian, U.; Bernacca, P. L.; Crézé, M.; Donati, F. et al. (July 1997). "The HIPPARCOS Catalogue". Astronomy & Astrophysics 323: L49–L52. Bibcode: 1997A&A...323L..49P. 
  14. ↑ van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy & Astrophysics 474 (2): 653–664. doi:10.1051/0004-6361:20078357. ISSN 0004-6361. Bibcode: 2007A&A...474..653V. 
  15. ↑ "THE ONE HUNDRED NEAREST STAR SYSTEMS". RECONS (Research Consortium On Nearby Stars). http://recons.org/TOP100.posted.htm. Retrieved 2015-01-12. 
  16. ↑ Mamajek, Eric E.; Barenfeld, Scott A.; Ivanov, Valentin D. (2015). "The Closest Known Flyby of a Star to the Solar System". The Astrophysical Journal 800 (1): L17. doi:10.1088/2041-8205/800/1/L17. Bibcode: 2015ApJ...800L..17M. 
  17. ↑ Coryn Bailer-Jones (2015-01-01). "The closest encounter is Hip 85605. How reliable is this?". http://www.mpia.de/homes/calj/stellar_encounters/FAQ1.html#hip85605. Retrieved 2015-01-05. 
  18. ↑ Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G.  Gaia DR2 record for this source at VizieR.



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