Gliese 710: Difference between revisions

From Wikipedia, the free encyclopedia
Content deleted Content added
No edit summary
Vtilroe (talk | contribs)
m Undid revision 350464320 by 99.65.211.118 (talk) [vandalism]; changed & fixed reference to primary source
Line 33: Line 33:
age=? }}
age=? }}
{{Starbox catalog |
{{Starbox catalog |
names=Gliese 710, BD-01 3474, Gl 710, HIP 89825, HD 168442, U449, Vys/McC 63, NSV 10635, Snookie }}
names=Gliese 710, BD-01 3474, Gl 710, HIP 89825, HD 168442, U449, Vys/McC 63, NSV 10635}}
{{Starbox end}}
{{Starbox end}}


Line 40: Line 40:
It is currently about 63.0 [[light year]]s from [[Earth]], but its [[proper motion]], distance, and [[radial velocity]]<ref>See also: [[Stellar kinematics]].</ref> indicate that it will approach within 0.158 [[light years]] (10,000 [[astronomical unit|AU]]) from Earth within 1.5 million years, based on the latest ''[[Hipparcos]]'' data. At closest approach it will be a first-magnitude star about as bright as [[Antares]]. The proper motion of this star is very small for its distance, meaning it is traveling nearly directly in our line of sight; compare for example with [[Arcturus]].
It is currently about 63.0 [[light year]]s from [[Earth]], but its [[proper motion]], distance, and [[radial velocity]]<ref>See also: [[Stellar kinematics]].</ref> indicate that it will approach within 0.158 [[light years]] (10,000 [[astronomical unit|AU]]) from Earth within 1.5 million years, based on the latest ''[[Hipparcos]]'' data. At closest approach it will be a first-magnitude star about as bright as [[Antares]]. The proper motion of this star is very small for its distance, meaning it is traveling nearly directly in our line of sight; compare for example with [[Arcturus]].


In a time interval of ±10 million years from the present, Gliese 710 is the star whose combination of mass and close approach distance will cause the greatest [[gravitation]]al perturbation of our [[solar system]]. Specifically, it has the potential to perturb the hypothetical [[Oort cloud]] enough to send a shower of [[comet]]s into the inner solar system, possibly causing an [[impact event]]. However, recent dynamic models by García-Sánchez, et al. indicate that the net increase in cratering rate due to the passage of Gliese 710 will be no more than 5%. They estimate that the closest approach will happen in 1,500,000&nbsp;years when the star will approach within 10,000AU (0.158 [[light years]]) of the Sun. Bobylev's calculations suggest Gliese 710 has an 86 per cent chance of passing through the Oort cloud.<ref>{{http://www.newscientist.com/article/dn18655-hurtling-star-on-a-path-to-clip-solar-system.html}}</ref>
In a time interval of ±10 million years from the present, Gliese 710 is the star whose combination of mass and close approach distance will cause the greatest [[gravitation]]al perturbation of our [[solar system]]. Specifically, it has the potential to perturb the hypothetical [[Oort cloud]] enough to send a shower of [[comet]]s into the inner solar system, possibly causing an [[impact event]]. However, recent dynamic models by García-Sánchez, et al. indicate that the net increase in cratering rate due to the passage of Gliese 710 will be no more than 5%. They estimate that the closest approach will happen in 1,500,000&nbsp;years when the star will approach within 10,000AU (0.158 [[light years]]) of the Sun. Bobylev's calculations suggest Gliese 710 has an 86 per cent chance of passing through the Oort cloud.<ref name="Bobylev:arXiv1003.2160">{{cite journal |last=Bobylev |first=Vadim V. |authorlink= |year=2010 |month=March |title=Searching for Stars Closely Encountering with the Solar System |journal=Astronomy Letters |volume=36 |issue=3 |pages=220-226 |doi=10.1134/S1063773710030060 |url=http://arxiv.org/abs/1003.2160 |accessdate= |quote= }} </ref>


The star with the second greatest perturbational effect in the past or future 10 million years was [[Algol]],<ref name="García-Sánchez1999">{{cite journal
The star with the second greatest perturbational effect in the past or future 10 million years was [[Algol]],<ref name="García-Sánchez1999">{{cite journal
Line 55: Line 55:
*{{cite journal |last=García-Sánchez |first=Joan |authorlink= |coauthors=''et al.'' |year=1999 |month= |title=Stellar encounters with the Oort cloud based on ''Hipparcos'' data |journal=The Astronomical Journal |volume=117 |issue= |pages=1042–1055 |doi=10.1086/300723 |url= |accessdate= |quote= }}
*{{cite journal |last=García-Sánchez |first=Joan |authorlink= |coauthors=''et al.'' |year=1999 |month= |title=Stellar encounters with the Oort cloud based on ''Hipparcos'' data |journal=The Astronomical Journal |volume=117 |issue= |pages=1042–1055 |doi=10.1086/300723 |url= |accessdate= |quote= }}


* [http://arxiv.org/abs/1003.2160 Searching for Stars Closely Encountering with the Solar System ] Vadim V. Bobylev - [http://dx.doi.org/10.1134/S1063773710030060 DOI:10.1134/S1063773710030060] - Astronomy Letters, 2010 Vol. 36, No. 3, arXiv:1003.2160v1
*{{cite journal |last=Bobylev |first=Vadim V. |authorlink= |year=2010 |title=Searching for Stars Closely Encountering with the Solar System |journal=Astronomy Letters |volume=36 |issue=3 |pages=220-226 |doi=10.1134/S1063773710030060 |url=http://arxiv.org/abs/1003.2160 |accessdate= |quote= }}


==External links==
==External links==

Revision as of 06:43, 18 March 2010

Gliese 710
Observation data
Epoch J2000      Equinox J2000
Constellation Serpens
Right ascension 18h 19m 51s
Declination −01° 56.4′
Apparent magnitude (V) 9.65–9.69(var)
Characteristics
Spectral type K7V
U−B color index 1.23
B−V color index 1.36
Variable type Suspected
Astrometry
Radial velocity (Rv)−24.0 km/s
Proper motion (μ) RA: −130 mas/yr
Dec.: −50 mas/yr
Parallax (π)51.8 ± 7.1 mas
Distanceapprox. 63 ly
(approx. 19 pc)
Absolute magnitude (MV)8.7 ± 0.3
Details
Mass0.6[1] M
Radius0.67[2] R
Luminosity(bolometric)0.042 L
Temperature4250[1] K
Metallicity?
Rotation>14 km/s.
Age? years
Other designations
Gliese 710, BD-01 3474, Gl 710, HIP 89825, HD 168442, U449, Vys/McC 63, NSV 10635

Gliese 710 is an orange dwarf star (K7 spectral class) in the constellation Serpens Cauda, with visual magnitude 9.66 and a mass of 0.4–0.6 solar masses.

It is currently about 63.0 light years from Earth, but its proper motion, distance, and radial velocity[3] indicate that it will approach within 0.158 light years (10,000 AU) from Earth within 1.5 million years, based on the latest Hipparcos data. At closest approach it will be a first-magnitude star about as bright as Antares. The proper motion of this star is very small for its distance, meaning it is traveling nearly directly in our line of sight; compare for example with Arcturus.

In a time interval of ±10 million years from the present, Gliese 710 is the star whose combination of mass and close approach distance will cause the greatest gravitational perturbation of our solar system. Specifically, it has the potential to perturb the hypothetical Oort cloud enough to send a shower of comets into the inner solar system, possibly causing an impact event. However, recent dynamic models by García-Sánchez, et al. indicate that the net increase in cratering rate due to the passage of Gliese 710 will be no more than 5%. They estimate that the closest approach will happen in 1,500,000 years when the star will approach within 10,000AU (0.158 light years) of the Sun. Bobylev's calculations suggest Gliese 710 has an 86 per cent chance of passing through the Oort cloud.[4]

The star with the second greatest perturbational effect in the past or future 10 million years was Algol,[1] a triple star system that passed no closer than 9.8 light years, 7.3 million years ago, but with a considerably larger total mass of 5.8 solar masses. Algol (also known as the Demon Star) was traditionally considered the unluckiest star in the sky, which is reflected in its name (Al-ghol means 'the ghoul' in Arabic)

References

  1. ^ a b c García-Sánchez, Joan (1999). "Stellar Encounters with the Oort Cloud Based on HIPPARCOS Data". The Astronomical Journal. 117 (2): 1042–1055. Bibcode:1999AJ....117.1042G. doi:10.1086/300723. {{cite journal}}: Unknown parameter |coauthors= ignored (|author= suggested) (help); Unknown parameter |month= ignored (help)
  2. ^ Johnson H. M. (1983). "Predicted infrared brightness of stars within 25 parsecs of the sun". The Astrophysical Journal Supplement Series. 53: 643–711. Bibcode:1983ApJS...53..643J. doi:10.1086/190905. {{cite journal}}: Unknown parameter |coauthors= ignored (|author= suggested) (help); Unknown parameter |month= ignored (help)
  3. ^ See also: Stellar kinematics.
  4. ^ Bobylev, Vadim V. (2010). "Searching for Stars Closely Encountering with the Solar System". Astronomy Letters. 36 (3): 220–226. doi:10.1134/S1063773710030060. {{cite journal}}: Unknown parameter |month= ignored (help)

Further reading

  • García-Sánchez, Joan (1999). "Stellar encounters with the Oort cloud based on Hipparcos data". The Astronomical Journal. 117: 1042–1055. doi:10.1086/300723. {{cite journal}}: Cite has empty unknown parameter: |month= (help); Unknown parameter |coauthors= ignored (|author= suggested) (help)

External links