Theta1 Orionis D

In this article, we will delve into the fascinating world of Theta1 Orionis D, exploring its different facets and meanings. From its origin to its relevance today, Theta1 Orionis D has been an object of interest and study for various disciplines. Throughout history, Theta1 Orionis D has sparked curiosity and debate among experts and fans, generating a wide spectrum of opinions and theories. Through this article, we will seek to shed light on Theta1 Orionis D and analyze its impact on society, culture and everyday life. This fascinating topic invites us to reflect and question our perceptions, presenting an enriching and diverse panorama that deserves to be explored carefully.

Star in the constellation Orion

For other stars with this Bayer designation, see θ Orionis.

θ¹ Orionis D

Theta1 Orionis D and companions in the Trapezium cluster
Observation data Epoch J2000      Equinox J2000
Constellation	Orion
Right ascension	05h 35m 17.24645s[1]
Declination	−05° 23′ 16.5707″[1]
Apparent magnitude (V)	6.70[2]
Characteristics
Spectral type	B1.5 Vp[3]
U−B color index	−0.71[2]
B−V color index	+0.09[2]
Astrometry
Radial velocity (Rv)	+32.4[4] km/s
Proper motion (μ)	RA: +1.822[1] mas/yr Dec.: _0.393[1] mas/yr
Parallax (π)	2.2820±0.0207 mas[1]
Distance	1,430 ± 10 ly (438 ± 4 pc)
Absolute magnitude (MV)	−3.3[5]
Details
Mass	18±6[5] M☉
Radius	5.6±0.8[5] R☉
Luminosity	29,500[5] L☉
Surface gravity (log g)	4.2±0.1[5] cgs
Temperature	32,000±1,000[5] K
Rotational velocity (v sin i)	49.0±0.9[5] km/s
Age	2.5±0.5[5] Myr
Other designations
θ1 Orionis D, 41 Orionis D, HR 1896, HD 37023, HIP 26224, WDS J05353-0523D
Database references
SIMBAD	data

Theta¹ Orionis D (θ¹ Orionis D) is a member of the Trapezium open cluster that lies within the Orion Nebula. It is a B class blue main sequence star with several faint companions.

θ¹ Orionis consists of multiple components, primarily the four stars of the Trapezium cluster (A, B, C, and D) all within one arc-minute of each other. θ² Orionis is a more distant grouping of three main stars plus several fainter companions, 1-2 arc-minutes from θ¹.

θ¹ D itself has a faint optical companion 1.4" away and a spectroscopic companion in a 40-day orbit. Infrared Optical Telescope Array observations suggest another companion at 18.6 mas.^[6]

References

1. ^ ^{a b c d e} 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.
2. ^ ^{a b c} 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: 0. Bibcode:2002yCat.2237....0D.
3. ^ Levenhagen, R. S.; Leister, N. V. (2006). "Spectroscopic analysis of southern B and Be stars". Monthly Notices of the Royal Astronomical Society. 371 (1): 252–262. arXiv:astro-ph/0606149. Bibcode:2006MNRAS.371..252L. doi:10.1111/j.1365-2966.2006.10655.x. S2CID 16492030.
4. ^ Olivares, J.; Sánchez, L. J.; Ruelas-Mayorga, A.; Allen, C.; Costero, R.; Poveda, A. (2013). "Kinematics of the Orion Trapezium Based on Diffracto-Astrometry and Historical Data". The Astronomical Journal. 146 (5): 106. arXiv:1310.0769. Bibcode:2013AJ....146..106O. doi:10.1088/0004-6256/146/5/106. S2CID 119110490.
5. ^ ^{a b c d e f g h} Simón-Díaz, S.; Herrero, A.; Esteban, C.; Najarro, F. (2006). "Detailed spectroscopic analysis of the Trapezium cluster stars inside the Orion nebula". Astronomy and Astrophysics. 448 (1): 351–366. arXiv:astro-ph/0510288. Bibcode:2006A&A...448..351S. doi:10.1051/0004-6361:20053066. ISSN 0004-6361. S2CID 16445304.
6. ^ Grellmann, R.; Preibisch, T.; Ratzka, T.; Kraus, S.; Helminiak, K. G.; Zinnecker, H. (2013). "The multiplicity of massive stars in the Orion Nebula Cluster as seen with long-baseline interferometry". Astronomy & Astrophysics. 550: A82. arXiv:1301.3045. Bibcode:2013A&A...550A..82G. doi:10.1051/0004-6361/201220192. S2CID 6554786.