HIP 85605

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Star
HIP 85605
AladinLite
Observation
dates equinox :  J2000.0 , epoch : J2000.0
Constellation Hercules
Right ascension 17 h 29 m 36.2 s
declination + 24 ° 39 ′ 14 ″
Apparent brightness 11.03 mag
Typing
Astrometry
Radial velocity −21.36 ± 0.32 km / s
parallax 1.822 ± 0.027  mas
Proper movement 
Rec. Share: +4.751 ± 0.031  mas / a
Dec. portion: −8.628 ± 0.043  mas / a
Physical Properties
radius 5.8  R ☉
Luminosity

15  L ☉

Effective temperature 4700  K
Other names
and catalog entries
Hipparcos catalog HIP 85605 [1]
Tycho catalog TYC 2079-1800-1 [2]Template: Infobox star / maintenance / specification of the TYC catalog
2MASS catalog 2MASS J17293627 + 2439111 [3]

HIP 85605 is a star in the constellation Hercules with an apparent magnitude of 11.03 mag.

Observation history

The 1997 parallax measurement of the Hipparcos astrometry satellite showed a value of 202 ± 39 milli-arcseconds, which means a distance of 16.1 light years from the Sun and would have made the star one of the closest to the Sun. In 2007 the reading was revised to 147 ± 30 milli-arcseconds, which would have been 22.2 light years. Based on these measurements, it was estimated in 2014 that HIP 85605 could pass the solar system at a distance of 0.13 to 0.65 light years in 240,000 to 470,000 years. The measurements of the astrometric probe Gaia finally showed that the parallax measured by Hipparcos was wrong. The parallax of HIP 85605, determined by Gaia, is 1.822 ± 0.027 milli-arcseconds, which results in a distance of over 500 parsecs. In addition to the original assumptions about the distance, the measurements by Gaia also clarified that it is not, as originally also assumed, a companion of HIP 85607, but that it is an optical double star.

Individual evidence

  1. ↑ a b c d e f g Gaia Collaboration. Gaia DR2 https://gea.esac.esa.int/archive/ Retrieved May 30, 2018
  2. ^ Strasbourg astronomical data center . Published January 3, 2015