OCSN 27
0.68
UTI
0.71
CN
1.0
Cdens
1.0
CC3
0.35
Clit
1.0
Cdup
Stellar density (N50/rad)
9.4 [N/pc2]
- CN 0.71 Moderately populated
- Cdens 1.0 Very dense
- CC3 1.0 Very high quality
- Clit 0.35 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
OCSN 27 is a moderately populated, very dense object of very high C3 quality. Its parallax locates it at a very close distance, near the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, very young cluster (see Parameters). It was recently reported in the literature.
Note: This object shares a significant 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 | 321.634 | 47.638 | 2.421 | 3.328 | -2.486 | -15.463 |
| Liu et al. | 2025 | 321.61 | 47.63 | 2.41 | 3.26 | -2.51 | -16.31 |
| Zhang et al. | 2024 | 321.607 | 47.633 | â | â | â | â |
| Hunt & Reffert | 2024 | 321.607 | 47.633 | 2.407 | 3.257 | -2.506 | -16.306 |
| Cavallo et al. | 2024 | 320.857 | 47.609 | 2.402 | â | â | â |
| Hunt & Reffert | 2023 | 321.607 | 47.633 | 2.407 | 3.257 | -2.506 | -16.306 |
| Qin et al. | 2023 | 321.68 | 47.54 | 2.41 | 3.3 | -2.53 | -15.23 |
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 | 0.435 | 0.245 | 0.49 | 18 | -0.005 | 64 | â | â |
| Liu et al. | 2025 | 0.44 | 0.09 | â | 30 | â | â | â | â |
| Zhang et al. | 2024 | â | â | â | â | 0.089(1) | â | â | â |
| Hunt & Reffert | 2024 | â | â | â | â | â | 64(1) | â | â |
| Cavallo et al. | 2024 | 0.43 | 0.56 | â | 10 | -0.100 | â | â | â |
| Hunt & Reffert | 2023 | 0.41 | 0.15 | 0.49 | 15 | â | â | â | â |
| Qin et al. | 2023 | 0.49 | 0.34 | â | 22 | â | â | â | â |
(N): Indicates that there are N extra values assigned to this parameter in the corresponding reference.
Liu et al. (2025)
Classified as primordial binary cluster 315 along with OCSN_28, and of multiple system 78 along with OCSN_28 and Theia_101.
Palma et al. (2025)
Part of multiple system G239, along with Theia_248, Theia_101 and OCSN_28.
Cavallo et al. (2024)
Gold sample.