OCSN 100
0.61
UTI
0.77
CN
1.0
Cdens
1.0
CC3
0.13
Clit
1.0
Cdup
Nm (P>50%)
152
Core radius and density
1.1 [pc], 9.8 [pc-2]
- CN 0.77 Rich
- Cdens 1.0 Very dense
- 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 100 is a rich, very dense object of very 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, very young cluster, but with a large variance across recent sources for the absorption parameter (see Parameters). It was recently reported in the literature.
Note: This object shares a small percentage of members with at least one entry reported in the same catalogue. 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 | 242.706 | -19.441 | 7.174 | -8.761 | -24.38 | -7.18 |
| Liu et al. | 2025 | 242.72 | -19.38 | 7.19 | -8.64 | -24.33 | -11.06 |
| Swiggum et al. | 2024 | 242.721 | -19.383 | 7.193 | -8.641 | -24.329 | -6.803 |
| Hunt & Reffert | 2024 | 242.721 | -19.383 | 7.193 | -8.641 | -24.329 | -11.056 |
| Cavallo et al. | 2024 | 242.676 | -19.339 | 7.195 | â | â | â |
| Hunt & Reffert | 2023 | 242.721 | -19.383 | 7.193 | -8.641 | -24.329 | -11.056 |
| Qin et al. | 2023 | 242.88 | -19.41 | 7.19 | -8.66 | -24.36 | -7.64 |
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 | 0.41 | 0.92 | 4 | -0.290 | 54 | â | â |
| Liu et al. | 2025 | 0.17 | 0.27 | â | 8 | â | â | â | â |
| Swiggum et al. | 2024 | 0.14 | â | â | 4 | â | 50 | â | â |
| Hunt & Reffert | 2024 | 0.13 | 0.41 | 0.92 | 4 | â | 59(1) | â | â |
| Cavallo et al. | 2024 | 0.13 | 1.27 | â | 2 | -0.290 | â | â | â |
| Hunt & Reffert | 2023 | 0.13 | 0.41 | 0.92 | 4 | â | â | â | â |
| Qin et al. | 2023 | 0.19 | 0.91 | â | 7 | 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 325 along with OCSN_96, and as primordial binary cluster 327 along with HSC_2931, and of multiple system 72 along with OCSN_96, HSC_2907, HSC_2931, OCSN_98 and HSC_2919.
Palma et al. (2025)
Part of multiple system G172, along with OCSN_98, HSC_2907, OCSN_96, HSC_2931 and HSC_2919.
Cavallo et al. (2024)
Gold sample.
Hunt & Reffert (2024)
Classified as open cluster. CMD class: 1.00 (50th percentile).
Hunt & Reffert (2023)
Classified as open cluster. CMD class: 1.00 (50th percentile).