OC 0227
0.45
UTI
0.0
CN
1.0
Cdens
0.75
CC3
0.25
Clit
1.0
Cdup
Stellar density (N50/rad)
33.1 [N/pc2]
- CN 0.0 Sparse
- Cdens 1.0 Very dense
- CC3 0.75 High quality
- Clit 0.25 Poorly studied
- Cdup 1.0 Unique
đĨ Members
đ Colab
đŦ Bayestar19
MOCA
đ CDS
đ Simbad
đ CDS (Îą, δ)
đ Simbad (Îą, δ)
MOCA
đ CDS
đ Simbad
đ CDS (Îą, δ)
đ Simbad (Îą, δ)
Overview
OC 0227 is a sparse, very dense object of high C3 quality. Its parallax locates it at a close distance, above the mid-plane, affected by moderate extinction. It is catalogued as a near-solar metallicity, very young cluster, but with a large variance across recent sources for the absorption and age parameters (see Parameters). It is poorly studied in the literature.
Note: This object shares a large percentage of members with a later reported entry. See table with shared members information.
Data
| Reference | Year | RA [deg] | DEC [deg] | Plx [mas] | pmRA [mas/yr] | pmDE [mas/yr] | Rv [km/s] |
|---|---|---|---|---|---|---|---|
| UCC | 99999â | 7.63 | 65.499 | 1.401 | 2.184 | -2.783 | 14.599 |
| Cavallo et al. | 2024 | 7.598 | 65.567 | 1.416 | â | â | â |
| Hunt & Reffert | 2023 | 7.638 | 65.503 | 1.414 | 2.27 | -2.785 | 6.339 |
| Hao et al. | 2022 | 7.65 | 65.481 | 1.387 | 2.158 | -2.908 | -11.867 |
đĄ Note: The UCC values are estimated from its identified members.
| Reference | Year | Dist [kpc] | Av [mag] | DAv [mag] | Age [Myr] | [Fe/H] [dex] | Mass [Msun] | Bfrac | BSS |
|---|---|---|---|---|---|---|---|---|---|
| UCC | 99999â | 0.84 | 1.955 | 1.71 | 4 | 0.131 | â | â | â |
| Liu et al. | 2025 | 0.84 | 0.32 | â | 4 | â | â | â | â |
| Cavallo et al. | 2024 | 1.15 | 2.01 | â | 209 | 0.150 | â | â | â |
| Hunt & Reffert | 2023 | 0.68 | 2.43 | 1.71 | 3 | â | â | â | â |
| Hao et al. | 2022 | â | 1.90 | â | 4 | 0.112 | â | â | â |
Liu et al. (2025)
Classified as primordial binary cluster 304 along with Theia_19.
Palma et al. (2025)
Classified as genetic pair P240, along with Theia_19.
Cavallo et al. (2024)
Wood sample.
Hunt & Reffert (2024)
Classified as a moving group.