1 Aquarii

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1 Aquarii
Observation data
Epoch J2000      Equinox J2000
Constellation Aquarius
Right ascension 20h 39m 24.8915s
Declination +00° 29′ 11.201″
Apparent magnitude (V) 5.154
Characteristics
Spectral type K1III
U−B color index 0.97
B−V color index 1.06
Astrometry
Radial velocity (Rv) -42.7 km/s
Proper motion (μ) RA: 103.00 mas/yr
Dec.: -19.44 mas/yr
Parallax (π) 13.33 ± 0.88 mas
Distance 240 ± 20 ly
(75 ± 5 pc)
Absolute magnitude (MV) 0.77[1]
Details
Temperature 3,500–5,000 K
Metallicity -0.12[1]
Rotation 1.9[1]
Age ~5 × 109 years
Orbit
Companion 1 Aquarii B
Semi-major axis (a) 59.7"
Inclination (i) 221°
Orbit
Companion 1 Aquarii C
Semi-major axis (a) 69.8"
Inclination (i) 36°
Other designations
1 Aqr, HR 7897, HD 196758, SAO 126062, BD +0 4064, FK5 3651, WDS J20394+0029, CCDM J20394+0029.
Database references
SIMBAD data
Data sources:
Hipparcos Catalogue,
CCDM (2002),
Bright Star Catalogue (5th rev. ed.)

1 Aquarii, also known as 1 Aqr, is a multiple star in the constellation Aquarius. 1 Aqr A is a K-class giant of the spectral type K1III. Its companions, B and C, are optical and have no physical relation to 1 Aqr A. 1 Aquarii is known to be an infra-red source.

Components[edit]

NAME Right ascension Declination Apparent magnitude (V) Database references
1 Aquarii B (BD-00 4064B) 20h 39m 21.8s +00° 28' 25 11.5 Simbad
1 Aquarii C (BD-00 4064C) 20h 39m 27.1s +00° 30' 07 11.3 Simbad

References[edit]