42 Orionis

Star in the constellation of Orion

42 Orionis

Location of 42 Orionis (marked red)

Observation data
Epoch J2000      Equinox J2000
Constellation | Orion
Right ascension | 05h 35m 23.16427s[1]
Declination | −04° 50′ 18.0881″[1]
Apparent magnitude (V) | 4.59[2]
Characteristics
Spectral type | B1V[3]
U−B color index | −0.94[2]
B−V color index | −0.19[2]
Astrometry
Radial velocity (Rv)| +28.40[4] km/s
Proper motion (μ)|  RA: +4.52[1] mas/yr
Dec.: −7.11[1] mas/yr
Parallax (π)| 3.69±1.20 mas[1]
Distance| approx. 900 ly
(approx. 270 pc)
Details
Mass| 12.0[5] M☉
Radius| 7.0[6] R☉
Luminosity| 10,737[7] L☉
Surface gravity (log g)| 3.82[6] cgs
Temperature| 25,400[7] K
Rotational velocity (v sin i)| 20[8] km/s
Age| 2.6[5] Myr
Other designations
c Orionis, BD−04°1185, CCDM J05354-0450AB, GC 6934, HIP 26237, HR 1892, HD 37018, NSV 2318, SAO 132320, WDS J05354-0450AB
Database references
SIMBAD| data
42 Ori is the bright star at the centre of NGC 1977.

42 Orionis, also known as c Orionis or c Ori, is a class B1V[3] (blue main-sequence) star in the constellation Orion. Its apparent magnitude is 4.59[2] and it is approximately 900 light years away based on parallax.[1]

The primary star, Aa, has one spectroscopic companion Ab of magnitude 6.3 and separation 0.16", and a more distant companion B of 7.5 magnitude at 1.6" separation.[9][10]

42 Orionis is surrounded by NGC 1977 one of a smaller fainter group of named nebulae just north of the Orion Nebula. 42 Ori is the star which excites and illuminates NGC 1977.

## References

[edit]

1. ^ a b c d e f Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664\. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. S2CID 18759600. Vizier catalog entry
2. ^ a b c d Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues. 2237. Bibcode:2002yCat.2237....0D.
3. ^ a b Hoffleit, D.; Warren, W. H. (1995). "VizieR Online Data Catalog: Bright Star Catalogue, 5th Revised Ed. (Hoffleit+, 1991)". VizieR On-line Data Catalog: V/50. Originally Published in: 1964BS....C......0H. 5050. Bibcode:1995yCat.5050....0H.
4. ^ Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771\. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. S2CID 119231169.
5. ^ a b Tetzlaff, N.; Neuhäuser, R.; Hohle, M. M. (2011). "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun". Monthly Notices of the Royal Astronomical Society. 410 (1): 190–200\. arXiv:1007.4883. Bibcode:2011MNRAS.410..190T. doi:10.1111/j.1365-2966.2010.17434.x. S2CID 118629873. Vizier catalog entry
6. ^ a b Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
7. ^ a b Hohle, M.M.; Neuhäuser, R.; Schutz, B.F. (2010). "Masses and luminosities of O- and B-type stars and red supergiants". Astronomische Nachrichten. 331 (4): 349. arXiv:1003.2335. Bibcode:2010AN....331..349H. doi:10.1002/asna.200911355. S2CID 111387483. Vizier catalog entry
8. ^ Abt, Helmut A.; Levato, Hugo; Grosso, Monica (2002). "Rotational Velocities of B Stars". The Astrophysical Journal. 573 (1): 359–365\. Bibcode:2002ApJ...573..359A. doi:10.1086/340590.
9. ^ Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog". The Astronomical Journal. 122 (6): 3466. Bibcode:2001AJ....122.3466M. doi:10.1086/323920. Vizier catalog entry
10. ^ Tokovinin, Andrei; Mason, Brian D.; Hartkopf, William I.; Mendez, Rene A.; Horch, Elliott P. (2015). "Speckle Interferometry at Soar in 2014". The Astronomical Journal. 150 (2): 50. arXiv:1506.05718. Bibcode:2015AJ....150...50T. doi:10.1088/0004-6256/150/2/50. S2CID 30737411.

* v
* t
* e

Constellation of Orion

* List of stars in Orion
* Orion in Chinese astronomy
* Orion molecular cloud complex
* Orion's Belt
* Orion's Sword

Stars|

| Bayer|

* α (Betelgeuse)
* β (Rigel)
* γ (Bellatrix)
* δ (Mintaka)
* ε (Alnilam)
* ζ (Alnitak)
* η
* θ1
* A
* B
* C
* D
* E
* F
* G
* H
* θ2
* ι (Hatysa)
* κ (Saiph)
* λ (Meissa)
* μ
* ν
* ξ
* ο1
* ο2
* π1
* π2
* π3 (Tabit)
* π4
* π5
* π6
* ρ
* σ
* τ
* υ
* φ1
* φ2
* χ1
* χ2
* ψ1
* ψ2
* ω

|

Flamsteed|

* 5
* 6 (g)
* 11
* 13
* 14 (i)
* 15
* 16 (h)
* 18
* 21
* 22 (o)
* 23 (m)
* 27 (p)
* 29 (e)
* 31
* 32 (A)
* 33
* 35
* 38
* 42 (c)
* 45
* 49 (d)
* 51 (b)
* 52
* 55
* 56
* 57
* 59
* 60
* 63
* 64
* 66
* 68
* 69 (f1)
* 71
* 72 (f2)
* 73
* 74 (k)
* 75 (l)

Variable|

* S
* U
* W
* UX
* VV
* BF
* BM
* DN
* FU
* GW
* V380
* V529
* V883
* V1005
* V1149
* V1201
* V1352
* V2247
* V2254
* V2384

HR|

* 1759
* 1763
* 1874
* 1887
* 1952
* 1988
* 2007
* 2024
* 2251
* 2275

HD|

* 33636
* 34445
* 37320
* 37605
* 42618
* 43317
* 290327

Other|

* 4U 0614+091
* CVSO 30
* CWISE J0506+0738
* Gliese 179
* Gliese 205
* Gliese 208
* Gliese 221
* GJ 3379
* HOPS 383
* LP 658-2
* PDS 110
* S Ori 52
* S Ori 70
* WISE J0457−0207
* WISE J0521+1025

| Exoplanets|

* HD 34445 b
* HD 37605 b
* HD 38529 b
* HD 290327 b

|

Star
clusters|

| NGC|

* 1662
* 1980
* 1981
* 2169
* 2175
* 2194
* 2202

|

Other|

* Lambda Orionis Cluster
* Trapezium Cluster (θ1)

Nebulae|

| NGC|

* 1788
* 1999
* 2022
* 2023
* 2064
* 2067
* 2071
* 2174

|

Other|

* Abell 12
* Abell 13
* Barnard 30
* Becklin–Neugebauer Object
* Flame Nebula
* HH 1/2
* HH 24-26
* HH 34
* HH 111
* Horsehead Nebula
* IC 434
* IC 2118
* LDN 1641
* McNeil's Nebula
* Messier 43
* Messier 78
* Orion Nebula

Galaxies|

| NGC|

* 1683
* 1719
* 1819
* 1924
* 2110
* 2119

|

Other|

* 4C +09.17
* CGCG 396-2
* II Zwicky 28
* PKS 0458-020
* PKS 0528+134
* TXS 0506+056

| Astronomical events|

* GRB 991216

|

Category
*[RA:]: Right Ascension
*[Dec.:]: Declination
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*[t]: Discuss this template
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