Mintaka

For other uses, see Mintaka (disambiguation).
Mintaka

Orion's Belt (composed of the three brightest stars shown), Mintaka being the rightmost, on the west side
Observation data
Epoch J2000      Equinox J2000
Constellation Orion
δ Ori A (Aa1 + Aa2 + Ab)
Right ascension 05h 32m 00.40009s[1]
Declination −00° 17′ 56.7424″[1]
Apparent magnitude (V) 2.23[2] (2.50 + 3.90[3])
δ Ori B
Right ascension 05h 31m 58.745s[4]
Declination −00° 18′ 18.65″[4]
Apparent magnitude (V) 14.0[5]
HD 36485
Right ascension 05h 32m 00.406s[6]
Declination −00° 17′ 04.38″[6]
Apparent magnitude (V) 6.85[5]
Characteristics
A
Spectral type O9.5II + B1V +B0IV[7]
U−B color index −1.05[2]
B−V color index −0.22[2]
Variable type Eclipsing binary[8]
C
Spectral type B3V + A0V[9]
U−B color index −0.71[10]
B−V color index −0.16[10]
Astrometry
Radial velocity (Rv)18.50±0.5[11] km/s
Proper motion (μ) RA: 0.64±0.56[1] mas/yr
Dec.: −0.69±0.27[1] mas/yr
Parallax (π)4.71 ± 0.58 mas[1]
Distance1,200[7] ly
(380[7] pc)
Absolute magnitude (MV)−5.8[5]
δ Ori Aa1
Absolute magnitude (MV)−5.4[5]
δ Ori Aa2
Absolute magnitude (MV)−2.9[5]
δ Ori Ab
Absolute magnitude (MV)−4.2[5]
HD 36485
Proper motion (μ) RA: +1.523[12] mas/yr
Dec.: −1.653[12] mas/yr
Parallax (π)2.6245 ± 0.0538 mas[12]
Distance1,240 ± 30 ly
(381 ± 8 pc)
Orbit[13]
Primaryδ Ori Aa1
Companionδ Ori Aa2
Period (P)5.732436 days
Semi-major axis (a)43.1±1.7 R☉
Eccentricity (e)0.1133±0.0003
Inclination (i)76.5±0.2°
Periastron epoch (T)2,456,295.674±0.062
Argument of periastron (ω)
(secondary)		141.3±0.2°
Orbit[9]
Primaryδ Ori Aa1/2
Companionδ Ori Ab
Period (P)53,839 days
Semi-major axis (a)20,038 R☉
Eccentricity (e)0.5886±0.016
Inclination (i)104.7±0.4°
Longitude of the node (Ω)122.4±0.5°
Periastron epoch (T)2,458,773.2±0.1
Argument of periastron (ω)
(secondary)		259±2°
Details
δ Ori Aa1
Mass17.8[9] M☉
Radius13.1[9] R☉
Luminosity190,000[7] L☉
Surface gravity (log g)3.55±0.05[9] cgs
Temperature31,400±1,000[9] K
Rotational velocity (v sin i)114±20[9] km/s
δ Ori Aa2
Mass8.518[9] M☉
Radius4.168[9] R☉
Luminosity16,000[7] L☉
Surface gravity (log g)3.48±0.06[9] cgs
Temperature25,442±1,500[9] K
Rotational velocity (v sin i)89±15[9] km/s
δ Ori Ab
Mass8.787[9] M☉
Radius12.045[9] R☉
Luminosity63,000[7] L☉
Surface gravity (log g)3.64±0.05[9] cgs
Temperature30,250±1,000[9] K
Rotational velocity (v sin i)216±25[9] km/s
δ Ori B
Radius0.77[14] R☉
Luminosity0.431[14] L☉
Temperature5,324[14] K
HD 36485
Mass6-11[15] M☉
Radius5.7[16] R☉
Luminosity3,300[16] L☉
Surface gravity (log g)4.41[16] cgs
Temperature18,400[16] K
Other designations
Mintaka, δ Orionis, 34 Orionis, 88 G. Orionis, FK5 206, HIP 25930, ADS 4134, CCDM J05320-0018, WDS J05320-0018
Mintaka Aa: HD 36486, HR 1851, SAO 132220/132221, BD−00°983, GC 6847
Mintaka Ab: CCDM J05320-0018D, WDS J05320-0018Ab
δ Ori B: UCAC3 180-24383, CCDM J05320-0018B, WDS J05320-0018B
HD 36485: δ Orionis C, HR 1851, SAO 132221, BD−00°982, GC 6848, PLX 1261, CCDM J05320-0018C
Database references
SIMBADdata
δ Ori B
HD 36485

Mintaka /ˈmɪntəkə/,[17] designation Delta Orionis (δ Orionis, abbreviated Delta Ori, δ Ori) and 34 Orionis (34 Ori), is a multiple star system some 1,200 light-years from the Sun in the constellation of Orion. Together with Alnitak (Zeta Orionis) and Alnilam (Epsilon Orionis), the three stars form Orion's Belt, known by many names among ancient cultures. The star is located very close to the celestial equator. When Orion is near the meridian, Mintaka is the rightmost of the Belt's stars when viewed from the Northern Hemisphere facing south.

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