User:Drbogdan/sandbox-HD 84406
Star in the constellation Ursa Major / From Wikipedia, the free encyclopedia
ALSO SEE => SUBPAGES
NOTE: "HD 84406" Article likely to be Redirected (or Deleted) - as/of 20220409 - Drbogdan (talk) 19:59, 9 April 2022 (UTC)
See related discussion at => "Wikipedia:Articles for deletion/HD 84406"
---
Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Ursa Major |
Right ascension | 09h 47m 30.55s[1] |
Declination | +63° 14′ 52.09″[1] |
Apparent magnitude (V) | 6.944[2] |
Characteristics | |
Spectral type | G8IV[3] |
Apparent magnitude (R) | 6.4[4] |
Apparent magnitude (J) | 5.265 ±0.0002[4] |
Apparent magnitude (H) | 4.824 ±0.024[4] |
Apparent magnitude (K) | 4.698 ±0.020[4] |
Astrometry | |
Radial velocity (Rv) | 6.97 km/s |
Proper motion (μ) | RA: −108.464±0.037[1] mas/yr Dec.: −137.615±0.053[1] mas/yr |
Parallax (π) | 12.6164 ± 0.0310 mas[1] |
Distance | 258.5 ± 0.6 ly (79.3 ± 0.2 pc) |
Absolute magnitude (MV) | 2.55[3] |
Details | |
Mass | 1.4[5] M☉ |
Radius | 5.1[6] R☉ |
Luminosity | 13.7[6] L☉ |
Surface gravity (log g) | 3.355[7] cgs |
Temperature | 4,905[6] K |
Metallicity [Fe/H] | −0.055[7] dex |
Age | 4.5[8] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
HD 84406, is a star approximately 258.5 light-years away in the constellation of Ursa Major. The star is a spectral type G star and has a high proper motion.[4]
On 4 February 2022, HD 84406 was the first star viewed by the James Webb Space Telescope. Relatively isolated, the star was used to test and align the focus of the telescope's 18 primary mirrors.[9][10][11][12] On 11 February 2022, The New York Times reported that "first light" images of HD 84406 from JWST were released—as well as related NASA alignment videos (2/11/2022; 3:00)[13] and (3/16/2022; 3:43).[14]