23 Ursae Majoris

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23 Ursae Majoris A/B
Observation data
Epoch J2000.0 (ICRS)
Constellation
(pronunciation)
Ursa Major
Right ascension 09h 31m 31.708s / 28.2s
Declination +63° 03′ 42.70″ / 43″
Apparent magnitude (V) +3.65 / +9.0
Distance 75.5 ± 1.1 ly
(23.1 ± 0.3 pc)
Spectral type A: F0IV
Other designations
23 UMa, NN 3559, HR 3757,
HD 81937, BD +63 845, FK5 355, HIP 46733, SAO 14908, GC 13109,
ADS 7402, CCDM J09315+6303A/B
23 Ursae Majoris C
Observation data
Epoch J2000.0 (ICRS)
Constellation
(pronunciation)
Ursa Major
Right ascension 09h 31m 18.7s
Declination +63° 02′ 38″
Apparent magnitude (V) +10.5
Other designations
CCDM J09315+6303C; also, see designations for 23 Ursae Majoris A/B.

23 Ursae Majoris, or 23 UMa, is a triple star in the constellation Ursa Major. Its main components, 23 UMa A and 23 UMa B, are approximately 75.5 light years from Earth.

The primary component, 23 Ursae Majoris A, is a yellow-white F-type subgiant with an apparent magnitude of +3.65. At a separation of 22.7 arcseconds is the 9th magnitude 23 Ursae Majoris B. A and B form a physical binary. The third, optical, component, 23 Ursae Majoris C, is a magnitude +10.5 star 99.6 arcseconds away.

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