OCSN 91
0.50
UTI
0.25
CN
1.0
Cdens
0.75
CC3
0.25
Clit
1.0
Cdup
Stellar density (N50/rad)
14.1 [N/pc2]
- CN 0.25 Poorly populated
- 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
OCSN 91 is a poorly populated, very dense object of high C3 quality. Its parallax locates it at a very close distance, above the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, intermediate-age cluster, but with a large variance across recent sources for the absorption and age parameters (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 | 229.745 | -37.601 | 7.452 | -18.859 | -26.856 | 3.376 |
| Liu et al. | 2025 | 229.68 | -37.65 | 7.48 | -18.97 | -26.97 | 5.17 |
| Cavallo et al. | 2024 | 229.937 | -37.568 | 7.48 | â | â | â |
| Hunt & Reffert | 2023 | 229.683 | -37.652 | 7.48 | -18.971 | -26.97 | 5.166 |
| Qin et al. | 2023 | 229.69 | -37.72 | 7.43 | -18.94 | -26.82 | 6.01 |
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 | 0.135 | 0.86 | 1.13 | 248 | -0.030 | â | â | â |
| Liu et al. | 2025 | 0.14 | 0.02 | â | 16 | â | â | â | â |
| Cavallo et al. | 2024 | 0.13 | 1.66 | â | 479 | -0.030 | â | â | â |
| Hunt & Reffert | 2023 | 0.13 | 3.69 | 1.13 | 2104 | â | â | â | â |
| Qin et al. | 2023 | 0.14 | 0.06 | â | 16 | â | â | â | â |
Liu et al. (2025)
Classified as primordial binary cluster 243 along with HSC_2733, and as primordial binary cluster 324 along with OCSN_92, and of multiple system 70 along with HSC_2630, HSC_2636, UPK_606, HSC_2816, HSC_2733 and OCSN_92.
Palma et al. (2025)
Part of multiple system G232, along with OCSN_92, HSC_2816 and HSC_2733.
Cavallo et al. (2024)
Bronze sample.
Hunt & Reffert (2024)
Classified as a moving group.