Sigma Orionis
(Sigma Ori)
Summary
Sigma Orionis is a poorly populated, very dense object of very high C3 quality. It is located at a very close distance from the Sun, below the mid-plane. It is well-studied in the literature.
This object shares a large percentage of members with 2 later reported entries.
Positions
| Reference | RA | DEC | Plx | pmRA | pmDE | Rv |
|---|---|---|---|---|---|---|
| Kharchenko et al. (2003) | 84.7 | -2.6 | – | 4.43 | -1.52 | – |
| Kharchenko et al. (2005) | 84.67 | -2.61 | – | 3.42 | -0.2 | 29.45 |
| Kharchenko et al. (2007) | 84.67 | -2.6 | – | 0.4 | – | 29.45 |
| Piskunov et al. (2008) | 84.667 | -2.614 | – | – | – | – |
| Loktin & Popova (2017) | 84.675 | -2.6 | – | 1.731 | 0.467 | 29.4 |
| Donor et al. (2020) | 84.675 | -2.6 | – | 1.23 | -0.46 | 30.7 |
| Cantat-Gaudin et al. (2020) | 84.716 | -2.582 | 2.48 | 1.577 | -0.512 | – |
| Dias et al. (2021) | 84.758 | -2.594 | 2.479 | 1.59 | -0.568 | -13.802 |
| He et al. (2022) | 84.675 | -2.602 | 2.495 | 1.545 | -0.485 | – |
| Hunt & Reffert (2023) | 84.71 | -2.61 | 2.5 | 1.48 | -0.61 | 24.974 |
| Cavallo et al. (2024) | 84.72 | -2.615 | 2.497 | – | – | – |
| Celli et al. (2024) | 84.716 | -2.582 | – | – | – | – |
| Hunt & Reffert (2024) | 84.71 | -2.61 | 2.5 | 1.48 | -0.61 | 24.974 |
| Zhang et al. (2024) | 84.71 | -2.61 | – | – | – | – |
| Almeida et al. (2025) | 84.758 | -2.594 | – | – | – | – |
| UCC | 84.697 | -2.593 | 2.498 | 1.487 | -0.576 | 28.993 |
Estimated members
Explore data in Colab
Fundamental parameters
| Reference | Values |
|---|---|
| Kharchenko et al. (2003) | E(B-V)=0.05, Dist=363 |
| Kharchenko et al. (2005) | E(B-V)=0.05, Dist=399, logt=6.82 |
| Piskunov et al. (2008) | E(B-V)=0.05, Dist=399, logt=6.82, logMA=1.878 |
| Loktin & Popova (2017) | E(B-V)=0.17, Dist=473, logt=6.83 |
| Donor et al. (2020) | Fe/H=-0.15 |
| Dias et al. (2021) | Av=0.166, Dist=303, logage=6.997, [Fe/H]=-0.092 |
| He et al. (2022) | A0=0.15, logAge=6.5 |
| Hunt & Reffert (2023) | AV50=0.902, diffAV50=2.249, MOD50=7.907, logAge50=6.572 |
| Cavallo et al. (2024) | AV50=1.19, dMod50=8.06, logAge50=6.63, [Fe/H]50=0.09 |
| Celli et al. (2024) | Age=1.3, Mc=113.4 |
| Hunt & Reffert (2024) | MassJ=81.3549, MassTot=81.2919 |
| Zhang et al. (2024) | [Fe/H]ANN=-0.3147, [Fe/H]MCMC=-0.3126 |
| Almeida et al. (2025) | AV=0.166, Dist=303, logAge=6.997, MassRk=109.2 |
Search coordinates in Bayestar19
Cluster region map
Objects with shared members
| Cluster | % | RA | DEC | Plx | pmRA | pmDE | Rv | UTI |
|---|---|---|---|---|---|---|---|---|
| UBC 205 | 100.0 | 84.71 | -2.6 | 2.5 | 1.54 | -0.57 | 29.45 | 0.16 |
| OCSN 262 | 97.9 | 84.7 | -2.6 | 2.5 | 1.49 | -0.6 | 28.99 | 0.01 |