OCSN 28
0.46
UTI
0.8
CN
0.22
Cdens
1.0
CC3
0.13
Clit
1.0
Cdup
Nm (P>50%)
238
Core radius and density
3.7 [pc], 1.1 [pc-2]
- CN 0.8 Rich
- Cdens 0.22 Very loose
- CC3 1.0 Very high quality
- Clit 0.13 Rarely 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 28 is a rich, very loose 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.
Data
| Reference | Year | RA [deg] | DEC [deg] | Plx [mas] | pmRA [mas/yr] | pmDE [mas/yr] | Rv [km/s] |
|---|---|---|---|---|---|---|---|
| UCC | 99999â | 325.034 | 51.013 | 2.28 | 3.888 | -2.115 | -13.389 |
| Liu et al. | 2025 | 324.42 | 50.89 | 2.28 | 3.88 | -2.12 | -17.58 |
| Zhang et al. | 2024 | 324.419 | 50.891 | â | â | â | â |
| Swiggum et al. | 2024 | 324.419 | 50.891 | 2.28 | 3.881 | -2.121 | -13.534 |
| Cavallo et al. | 2024 | 324.813 | 51.017 | 2.286 | â | â | â |
| Hunt & Reffert | 2023 | 324.419 | 50.891 | 2.28 | 3.881 | -2.121 | -17.579 |
| Qin et al. | 2023 | 324.87 | 51.06 | 2.33 | 3.97 | -2.09 | -13.0 |
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 | 0.45 | 0.295 | 0.68 | 18 | 0.005 | 170 | â | â |
| Liu et al. | 2025 | 0.49 | 0.12 | â | 35 | â | â | â | â |
| Zhang et al. | 2024 | â | â | â | â | -0.019(1) | â | â | â |
| Swiggum et al. | 2024 | 0.44 | â | â | 18 | â | 170 | â | â |
| Cavallo et al. | 2024 | 0.45 | 0.74 | â | 13 | 0.030 | â | â | â |
| Hunt & Reffert | 2023 | 0.43 | 0.24 | 0.68 | 18 | â | â | â | â |
| Qin et al. | 2023 | 0.49 | 0.35 | â | 28 | 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_27, and as tidal capture (resonant trapping binary) 316 along with Theia_101, and of multiple system 78 along with OCSN_27 and Theia_101.
Palma et al. (2025)
Part of multiple system G239, along with Theia_248, Theia_101 and OCSN_27.
Cavallo et al. (2024)
Gold sample.
Hunt & Reffert (2024)
Classified as moving group. CMD class: 0.99 (50th percentile).
Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.99 (50th percentile).