Astronomy:Gliese 710

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Short description: Star in the constellation Serpens
Gliese 710
Observation data
Equinox J2000.0]] (ICRS)
Constellation Serpens
Right ascension  18h 19m 50.8412s[1]
Declination −01° 56′ 19.005″[1]
Apparent magnitude (V) 9.66[2] (9.65–9.69)[3]
Characteristics
Spectral type K7 Vk[4]
U−B color index +1.26[2]
B−V color index +1.37[2]
Variable type Suspected[3]
Astrometry
Radial velocity (Rv)−14.53±0.44[5] km/s
Proper motion (μ) RA: −0.414±0.019[5] mas/yr
Dec.: −0.108±0.017[5] mas/yr
Parallax (π)52.3963 ± 0.0171[5] mas
Distance62.25 ± 0.02 ly
(19.085 ± 0.006 pc)
Absolute magnitude (MV)8.20[6] (8.19–8.23)[note 1]
Details
Mass0.57[7] M☉
Radius0.58[7] R☉
Luminosity (bolometric)0.091[7] L☉
Luminosity (visual, LV)0.045[note 2] L☉
Surface gravity (log g)4.66[7] cgs
Temperature4,143[7] K
Metallicity [Fe/H]−0.11[7] dex
Rotational velocity (v sin i)6.42±0.78[8] km/s
Age300[9] Myr
Other designations
Gliese 710, BD–01°3474, HIP 89825, HD 168442, NSV 10635[2]
Database references
SIMBADdata
ARICNSdata

Gliese 710, or HIP 89825, is an orange 0.6 M☉ star in the constellation Serpens Cauda. It is projected to pass near the Sun in about 1.29 million years at a predicted minimum distance of 0.051 parsecs—0.1663 light-years (10,520 astronomical units)[5] (about 1.60 trillion km) – about 1/25th of the current distance to Proxima Centauri.[10] Such a distance would make for a similar brightness to the brightest planets, optimally reaching an apparent visual magnitude of about −2.7. The star's proper motion will peak around one arcminute per year,[11][12] a rate of apparent motion that would be noticeable over a human lifespan. This is a timeframe, based on data from Gaia DR3, well within the parameters of current models which cover the next 15 million years.

Description

Gliese 710 currently is 62.3 light-years (19.1 parsecs) from Earth in the constellation Serpens and has a below naked-eye visual magnitude of 9.69. A stellar classification of K7 Vk means it is a small main-sequence star mostly generating energy through the thermonuclear fusion of hydrogen at its core. (The suffix 'k' indicates that the spectrum shows absorption lines from interstellar matter.) Stellar mass is about 57% of the Sun's mass with an estimated 58% of the Sun's radius. It is suspected to be a variable star that may vary in magnitude from 9.65 to 9.69. As of 2020, no planets have been detected orbiting it.

Computing and details of the closest approach

An artist's rendering of the Oort cloud and the Kuiper belt (inset)

In their work Bobylev et.al in 2010 suggested Gliese 710 has an 86% chance of passing through the Oort cloud, assuming the Oort cloud to be a spheroid around the Sun with semiminor and semimajor axes of 80,000 and 100,000 AU respectively. The distance of closest approach of Gliese 710 is generally difficult to compute precisely as it depends sensitively on its current position and velocity; Bobylev et.al. estimated that Gliese 710 would pass within 0.311±0.167 parsecs (1.014±0.545 light-years) of the Sun.[13] At the time, there was even a 1 in 10,000 chance of the star penetrating into the region (d < 1,000 AU) where the influence of the passing star on Kuiper belt objects would be significant.

Results from new calculations that include input data from Gaia DR3 indicate that the flyby of Gliese 710 to the Solar System will on average be slightly closer at 0.051±0.003 pc (10635±500 au) in 1.29±0.04 Ma time, but with considerably less uncertainty.[5] The effects of such an encounter on the orbit of the Pluto–Charon system (and therefore, on the classical trans-Neptunian belt) are negligible, but Gliese 710 will traverse the outer Oort cloud (inside 100,000 AU or 0.48 pc) and reach the outskirts of the inner Oort cloud (inward of 20,000 AU).

Gliese 710 has the potential to perturb the Oort cloud in the outer Solar System, exerting enough force to send showers of comets into the inner Solar System for millions of years, triggering visibility of about ten naked-eye comets per year,[12] and possibly causing an impact event. According to Filip Berski and Piotr Dybczyński, this event will be "the strongest disrupting encounter in the future and history of the Solar System".[14] Earlier dynamic models indicated that the net increase in cratering rate due to the passage of Gliese 710 would be no more than 5%.[15] They had originally estimated that the closest approach would happen in 1,360,000 years when the star will approach within 0.337±0.177 parsecs (1.100±0.577 light-years) of the Sun.[16] Gaia DR2 later found the minimum perihelion distance to be 0.0676±0.0157 parsecs or 13,900 ± 3,200 AU about 1.281 million years from now.[17]

Table of parameters of predictions of Gliese 710 encounter with Sun

Source Date Encounter distance, pc Encounter time, Myr
[15] 1999 0.34 ± 0.18 pc (1.11 ± 0.59 ly) 1.36±0.04
[13] March 2010 0.311 ± 0.167 pc (1.01 ± 0.54 ly) 1.45±0.06
[11] November 2016 0.0648 ± 0.0303 pc (13,400 ± 6,200 AU) 1.35
[10] May 2018 0.052 ± 0.01 pc (10,700 ± 2,100 AU) 1.28±0.05
[17] May 2018 0.0676 ± 0.0157 pc (13,900 ± 3,200 AU) 1.281
[5] December 2020 0.051 ± 0.003 pc (10,520 ± 620 AU) 1.29±0.04
[18] June 2022 0.052 ± 0.002 pc (10,730 ± 410 AU) 1.29±0.02

See also

Notes

  1. ↑ From apparent magnitude and parallax: [math]\displaystyle{ \scriptstyle M_V = m_V + 5 + 5 \log_{10} \left( \frac{\mathrm{parallax\ in\ milliarcseconds}}{1000} \right) }[/math]
  2. ↑ Using the absolute visual magnitude of Gliese 710 [math]\displaystyle{ \scriptstyle M_{V_{\ast}}=8.20 }[/math] and the absolute visual magnitude of the Sun [math]\displaystyle{ \scriptstyle M_{V_{\odot}}=4.83 }[/math], the visual luminosity can be calculated by [math]\displaystyle{ \scriptstyle \frac{L_{V_{\ast}}}{L_{V_{\odot}}}=10^{0.4\left(M_{V_{\odot}} - M_{V_{\ast}}\right)} }[/math]

References

  1. ↑ 1.0 1.1 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.
  2. ↑ 2.0 2.1 2.2 2.3 "GJ 710". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=GJ+710. 
  3. ↑ 3.0 3.1 Kukarkin, B. V. et al. (1971). "The third edition containing information on 20437 variable stars discovered and designated till 1968". General Catalogue of Variable Stars (3rd ed.). Bibcode: 1971GCVS3.C......0K. 
  4. ↑ Gray, R. O. et al. (July 2006). "Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 parsecs: The Northern Sample I". The Astronomical Journal 132 (1): 161–170. doi:10.1086/504637. Bibcode: 2006AJ....132..161G. 
  5. ↑ 5.0 5.1 5.2 5.3 5.4 5.5 5.6 de la Fuente Marcos, Raúl; de la Fuente Marcos, Carlos (2020). "An Update on the Future Flyby of Gliese 710 to the Solar System Using Gaia EDR3: Slightly Closer and a Tad Later than Previous Estimates". Research Notes of the AAS 4 (12): 222. doi:10.3847/2515-5172/abd18d. Bibcode: 2020RNAAS...4..222D. 
  6. ↑ Koen, C.; Kilkenny, D.; Van Wyk, F.; Marang, F. (2010). "UBV(RI)C JHK observations of Hipparcos-selected nearby stars". Monthly Notices of the Royal Astronomical Society 403 (4): 1949. doi:10.1111/j.1365-2966.2009.16182.x. Bibcode: 2010MNRAS.403.1949K. 
  7. ↑ 7.0 7.1 7.2 7.3 7.4 7.5 Schweitzer, A. et al. (May 2019). "The CARMENES search for exoplanets around M dwarfs. Different roads to radii and masses of the target stars". Astronomy & Astrophysics 625: 16. doi:10.1051/0004-6361/201834965. A68. Bibcode: 2019A&A...625A..68S. 
  8. ↑ López-Santiago, J. et al. (May 2010). "A high-resolution spectroscopic survey of late-type stars: chromospheric activity, rotation, kinematics, and age". Astronomy and Astrophysics 514: A97. doi:10.1051/0004-6361/200913437. Bibcode: 2010A&A...514A..97L. 
  9. ↑ Passegger, V. M.; Schweitzer, A.; Shulyak, D.; Nagel, E.; Hauschildt, P. H.; Reiners, A.; Amado, P. J.; Caballero, J. A. et al. (2019). "The CARMENES search for exoplanets around M dwarfs. Photospheric parameters of target stars from high-resolution spectroscopy. II. Simultaneous multiwavelength range modeling of activity insensitive lines". Astronomy and Astrophysics 627: 627. doi:10.1051/0004-6361/201935679. Bibcode: 2019A&A...627A.161P. 
  10. ↑ 10.0 10.1 de la Fuente Marcos, Raúl; de la Fuente Marcos, Carlos (2018). "An Independent Confirmation of the Future Flyby of Gliese 710 to the Solar System Using Gaia". Research Notes of the AAS 2 (2): 30. doi:10.3847/2515-5172/aac2d0. Bibcode: 2018RNAAS...2...30D. 
  11. ↑ 11.0 11.1 Berski, Filip; Dybczyński, Piotr A. (2016-11-01). "Gliese 710 will pass the Sun even closer" (in en). Astronomy & Astrophysics 595: L10. doi:10.1051/0004-6361/201629835. ISSN 0004-6361. Bibcode: 2016A&A...595L..10B. 
  12. ↑ 12.0 12.1 Dorminey, Bruce. "Solar System's Next Close Encounter Will Be With Gliese 710, Say Astronomers". Forbes. https://www.forbes.com/sites/brucedorminey/2016/12/22/solar-systems-next-close-encounter-will-be-with-gliese-710-say-astronomers/#49d76a4b993d. 
  13. ↑ 13.0 13.1 Bobylev, Vadim V. (March 2010). "Searching for Stars Closely Encountering with the Solar System". Astronomy Letters 36 (3): 220–226. doi:10.1134/S1063773710030060. Bibcode: 2010AstL...36..220B. 
  14. ↑ Dvorsky, George. "Incoming Star Could Spawn Swarms of Comets When It Passes Our Sun" (in en-US). Gizmodo. https://gizmodo.com/incoming-star-could-spawn-swarms-of-comets-when-it-pass-1790406698. 
  15. ↑ 15.0 15.1 García-Sánchez, J. et al. (1999). "Stellar encounters with the Oort cloud based on Hipparcos data". The Astronomical Journal 117 (2): 1042–1055. doi:10.1086/300723. Bibcode: 1999AJ....117.1042G. 
  16. ↑ García-Sánchez, J.; Weissman, P. R.; Preston, R. A.; Jones, D. L.; Lestrade, J.-F.; Latham, D. W.; Stefanik, R. P.; Paredes, J. M. (2001). "Stellar encounters with the solar system". Astronomy and Astrophysics 379 (2): 634–659. doi:10.1051/0004-6361:20011330. Bibcode: 2001A&A...379..634G. 
  17. ↑ 17.0 17.1 Bailer-Jones, C.A.L.; Rybizki, J.; Andrae, R.; Fouesnea, M. (2018). "New stellar encounters discovered in the second Gaia data release". Astronomy & Astrophysics 616: A37. doi:10.1051/0004-6361/201833456. Bibcode: 2018A&A...616A..37B. 
  18. ↑ de la Fuente Marcos, Raúl; de la Fuente Marcos, Carlos (2022). "An Update on the Future Flyby of Gliese 710 to the Solar System Using Gaia DR3: Flyby Parameters Reproduced, Uncertainties Reduced". Research Notes of the AAS 6 (6): 136. doi:10.3847/2515-5172/ac7b95. Bibcode: 2022RNAAS...6..136D. 

External links



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