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δ Arae
Ara constellation map.png
Ara Constellation
Observation data
Epoch J2000      Equinox J2000
Constellation Ara
Right ascension 17h 31m 05.913s
Declination -60° 41′ 1.853″
Apparent magnitude (V) 3.6
Spectral type B8Vn
U-B color index -0.31
B-V color index -0.1
Radial velocity (Rv) 10 km/s
Proper motion (μ) RA: -53.65 mas/yr
Dec.: -99.37 mas/yr
Parallax (π) 17.42 ± 0.73 mas
Distance 187 ± 8 ly
(57 ± 2 pc)
Absolute magnitude (MV) 3.52
Mass 18 M
Radius 7 R
Luminosity 20,000 L
Temperature 10,000–30,000 K
Metallicity ?
Rotation 260 Km/s
0,00373685 Year
Age ? years
Companion IDS 17221-6036 B
Semimajor axis (a) 49.1"
Inclination (i) 320°
Other designations
Tseen Yin, GC 23681, IDS 17221-6036, TD1 20450, GCRV 10108, 2MASS J17310591-6041020, UBV M 22196, CCDM J17311-6041, N30 3896, UBV 14882, CPC 20.1 5284, HD 158094, PPM 362756, uvby98 100158094, CPD-60 6842, HIC 85727, SACS 381, CSI-60 6842 41, HIP 85727, SAO 253945, FK5 648, HR 6500.
Database references
Database references
Data sources:
Hipparcos Catalogue,
CCDM (2002),
Bright Star Catalogue (5th rev. ed.)

Delta Arae or Tseen Yin (δ Ara / δ Arae) is a star in the constellation Ara.

The name Tseen Yin is from Chinese 天陰 (Mandarin: tiānyīn) "The Dark Sky".

Delta Arae is a blue-white B-type main sequence dwarf with an apparent magnitude of +3.60. It is approximately 187 light years from Earth. It has a 12th magnitude optical companion designated δ Arae B, which is 47.4 arcseconds away.


NAME Right ascension Declination Apparent magnitude (V) Spectral type Database references
IDS 17221-6036 B (CPD-60 6842B) 17h 31m 01.5s -60° 40' 22 11.8 Simbad




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