Back 11 Ursae Minoris AST 11 de l'Ossa Menor Catalan 11 Ursae Minoris Spanish ۱۱ خرس کوچک Persian 11 Ursae Minoris French こぐま座11番星 Japanese Pherkad Minor Dutch 11 Ursae Minoris NB 11 Ursae Minoris Polish 11 Малой Медведицы Russian
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Ursa Minor |
| Right ascension | 15h 17m 05.88946s[1] |
| Declination | +71° 49′ 26.0473″[1] |
| Apparent magnitude (V) | 5.15[2] |
| Characteristics | |
| Spectral type | K4 III[3] |
| Apparent magnitude (B) | 6.664[2] |
| Apparent magnitude (J) | 2.657[2] |
| Apparent magnitude (H) | 1.931±0.192[2] |
| Apparent magnitude (K) | 1.701±0.198[2] |
| B−V color index | 1.514±0.004[2] |
| Astrometry | |
| Radial velocity (Rv) | −17.80±0.12[1] km/s |
| Proper motion (μ) | RA: +4.073 mas/yr[1] Dec.: +9.477 mas/yr[1] |
| Parallax (π) | 7.9260 ± 0.1249 mas[1] |
| Distance | 412 ± 6 ly (126 ± 2 pc) |
| Absolute magnitude (MV) | –0.37[4] |
| Details | |
| Mass | 2.60+0.48 −0.44[5] M☉ |
| Radius | 29.14±0.45[5] R☉ |
| Luminosity | 250±6[6] L☉ |
| Habitable zone inner limit | 15.63±0.57[5] AU |
| Habitable zone outer limit | 30.65±1.10[5] AU |
| Surface gravity (log g) | 1.78±0.04[6] cgs |
| Temperature | 4,253±25[6] K |
| Metallicity | −0.02±0.05[6] |
| Age | 639+507 −278[5] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
11 Ursae Minoris is a single[8] star located approximately 410 light years away[1] in the northern circumpolar constellation of Ursa Minor. The star is visible to the naked eye as a faint, orange-hued star with an apparent visual magnitude of 5.15.[2] It is moving closer to the Earth with a heliocentric radial velocity of −17.8 km/s.[1]
This is an aging K-type giant star with a stellar classification of K4 III.[3] It is 600 million years old with twice the mass of the Sun. As a consequence of exhausting the hydrogen at its core, the star has expanded to 29 times the Sun's radius.[5] It is radiating 250 times the luminosity of the Sun from its swollen photosphere at an effective temperature of 4,253 K.[6]
11 Ursae Minoris is sometimes named Pherkard or Pherkad Minor, the later name to distinguish it from Pherkad (Major) which is γ Ursae Minoris. It has also been designated as γ1 Ursae Minoris, in which case the brighter Pherkad is called γ2 Ursae Minoris, but these names are rarely used.[9] 11 Ursae Minoris is the Flamsteed designation.
11 Ursae Minoris has a detected planet discovered in August 2009.[4]
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