710

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Star
Gliese 710
Position of Gliese 710 in the constellation Snake
AladinLite
Observation
dates equinoxJ2000.0 , epoch : J2000.0
Constellation Snake
Right ascension 18 h 19 m 50.84 s
declination –01 ° 56 ′ 19 ″
Apparent brightness 9.66 likes
Typing
rel. Brightness
(G-band)
9.06 ± 0.01 mag
rel. Brightness
(J-band)
7.08 ± 0.03 mag
B − V color index +1.37 
U − B color index +1.26 
R − I index +0.74 
Spectral class K7 Vk
Astrometry
Radial velocity (-14.47 ± 0.00) km / s
parallax (52.52 ± 0.05)  mas
distance (62.10 ± 0.06)  Lj
(19.04 ± 0.02)  pc
Proper movement 
Rec. Share: (−0.46 ± 0.08)  mas / a
Dec. portion: (−0.03 ± 0.07)  mas / a
Physical Properties
Dimensions 0.61  M
Other names
and catalog entries
Bonn survey BD-01 3474
Henry Draper Catalog HD 168442 [1]
Gliese catalog GJ 710 [2]
Hipparcos catalog HIP 89825 [3]
SAO catalog SAO 142227 [4]
Tycho catalog TYC 5102-100-1 [5]Template: Infobox star / maintenance / specification of the TYC catalog
2MASS catalog 2MASS J18195084-0156190 [6]
Other names Gaia DR2 4270814637616488064

Template: Infobox star / maintenance / magGTemplate: Infobox star / maintenance / magJ

The distances of the stars closest to the Sun over a period of 20,000 years in the past to 80,000 years in the future. Gliese 710 will come closer to the sun, but only in 1.4 million years.

Gliese 710 is a star in the constellation Snake . It has an apparent magnitude of 9.66 mag and belongs to the spectral class K7 Vk. Its mass is about 60% of the solar mass and its distance about 62 light years (19 parsecs ).

The astrostatist Wilhelm Gliese pointed out the approach of the star . According to its proper motion and radial velocity , Gliese 710 will pass close to the sun in about 1.3 million years; at a distance of only around two light months. In a time interval of ± 10 million years it is the star whose combination of mass and proximity will disturb our solar system the most. The star currently closest to the Sun is Proxima Centauri with a distance of 4.2 light years (approx. 1.3 pc). The last major perturbation of our system was the three-star system Algol , which passed 7.3 million years ago at a distance of 9.8 light years. Despite its relatively long distance, Algol's disturbance effect was relatively strong due to its large mass (together 5.8 solar masses) and its slow encounter speed.

Calculation of the coming encounter

Artistic visualization of the Oort cloud and the Kuiper belt

The prognosis of the time and exact distance of the closest approach depends sensitively on the current position and speed of movement of the star. There were some older calculations for this, only with the data from the Gaia space probe are these available with increasingly useful accuracy (see below).

Gliese 710 has the potential to perturb the assumed Oort cloud sufficiently that a rain of comets will enter the inner solar system. At the same time, the earth's risk of being hit by a comet increases. According to dynamic model calculations by García-Sánchez et al. however, from 1999 the net increase in crater would not have been more than 5%. They estimated the closest approximation in 1.36 million years at a distance of 0.337 ± 0.177 parsecs (1.1 light years).

According to calculations by Vadim Bobylev of the Pulkovo Observatory Saint Petersburg in 2010, Gliese 710 would have an 86% chance of penetrating the Oort cloud, assuming that it was the shape and size of a spheroid around the sun with semi-axes of 80,000 and 100,000 Owns astronomical units . Bobylev estimated the closest approximation to be 0.311 ± 0.167 parsecs (1.01 ± 0.54 light years) in approximately 1.45 million years. He also estimated a 1 in 10,000 probability that the star would enter the region with d <1,000 AU, where it would significantly perturb the objects of the Kuiper Belt .

On the basis of the first measurements by the Gaia satellite (DR1), Filip Berski and Piotr Dybczyński from the Adam Mickiewicz University in Poznan calculated the closest possible approximation to just 77 light days or 13,365 ± 6,250 AU in approx. 1.35 million years.

In 2018, Raúl and Carlos de la Fuente Marcos from the Complutense University of Madrid calculated an approximation of 10,721 ± 2,114 AU or 62 light days in approximately 1.28 million years from newer Gaia data (DR2).

See also

Web links

Individual evidence

  1. a b c d e f g h i j HD 168442. In: SIMBAD . Center de Données astronomiques de Strasbourg , accessed August 26, 2018 .
  2. a b Filip Berski, Piotr Dybczyński: Gliese 710 will pass the Sun even closer. Close approach parameters recalculated based on the first Gaia data release . In: Astronomy and Astrophysics . 595, No. L10, November 15, 2016. bibcode : 2016A & A ... 595L..10B . doi : 10.1051 / 0004-6361 / 201629835 .
  3. Heinz Günther: On a collision course . In: Die Zeit , No. 25/1981.
  4. ^ A b Joan García-Sánchez, Robert A. Preston, Dayton L. Jones, Paul R. Weissman, Jean-François Lestrade, David W. Latham, Robert P. Stefanik: Stellar Encounters with the Oort Cloud Based on Hipparcos Data . In: The Astronomical Journal . 117, No. 2, February 1999, pp. 1042-1055. bibcode : 1999AJ .... 117.1042G . doi : 10.1086 / 300723 .
  5. Vadim V. Bobylev: Searching for Stars Closely Encountering with the Solar System . In: Astronomy Letters . 36, No. 3, March 13, 2010, pp. 220-226. arxiv : 1003.2160 . bibcode : 2010AstL ... 36..220B . doi : 10.1134 / S1063773710030060 .
  6. David Rennert: Gliese 710: A star that throws comets around. In: derStandard.at. December 28, 2016. Retrieved December 29, 2016 .
  7. ^ Raúl de la Fuente Marcos, Carlos de la Fuente Marcos: An Independent Confirmation of the Future Flyby of Gliese 710 to the Solar System Using Gaia DR2 . In: Research Notes of the AAS . 2, No. 2/30, May 10, 2018. arxiv : 1805.02644 . bibcode : 2018RNAAS ... 2b..30D . doi : 10.3847 / 2515-5172 / aac2d0 .