OCSN 61
0.44
UTI
0.84
CN
0.78
Cdens
1.0
CC3
0.19
Clit
0.74
Cdup
Nm (P>50%)
340
Core radius and density
3.0 [pc], 3.9 [pc-2]
- CN 0.84 Rich
- Cdens 0.78 Dense
- CC3 1.0 Very high quality
- Clit 0.19 Rarely studied
- Cdup 0.74 Likely 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 61 is a rich, dense object of very high C3 quality. Its parallax locates it at a very close distance, below 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 is likely a unique object, which shares a moderate percentage of members with at least one previously reported entry, and a moderate percentage 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 | 84.063 | -0.592 | 2.558 | -1.029 | -0.633 | 29.898 |
| Liu et al. | 2025 | 84.08 | -0.4 | 2.59 | -1.04 | -0.63 | 26.82 |
| Yang et al. | 2025 | 84.084 | -0.402 | â | â | â | â |
| Zhang et al. | 2024 | 84.084 | -0.402 | â | â | â | â |
| Swiggum et al. | 2024 | 84.084 | -0.402 | 2.59 | -1.045 | -0.63 | 31.646 |
| Hunt & Reffert | 2024 | 84.084 | -0.402 | 2.59 | -1.045 | -0.63 | 26.823 |
| Cavallo et al. | 2024 | 84.133 | -0.747 | 2.596 | â | â | â |
| Hunt & Reffert | 2023 | 84.084 | -0.402 | 2.59 | -1.045 | -0.63 | 26.823 |
| Qin et al. | 2023 | 84.14 | -0.45 | 2.57 | -1.08 | -0.62 | 31.65 |
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 | 0.375 | 0.19 | 0.655 | 12 | -0.130 | 108 | â | â |
| Liu et al. | 2025 | 0.32 | 0.01 | â | 27 | â | â | â | â |
| Yang et al. | 2025 | â | â | â | 12 | -0.130(3) | â | â | â |
| Zhang et al. | 2024 | â | â | â | â | 0.049(1) | â | â | â |
| Swiggum et al. | 2024 | 0.38 | â | â | 12 | â | 116 | â | â |
| Hunt & Reffert | 2024 | 0.37 | 0.19 | 0.65 | 12 | â | 100(1) | â | â |
| Cavallo et al. | 2024 | 0.39 | 0.57 | â | 7 | -0.130 | â | â | â |
| Hunt & Reffert | 2023 | 0.37 | 0.19 | 0.66 | 12 | â | â | â | â |
| Qin et al. | 2023 | 0.42 | 0.19 | â | 18 | 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 320 along with UBC_17a, and of multiple system 1 along with UBC_17a and ASCC_19.
Palma et al. (2025)
Part of multiple system G10, along with ASCC_19, ASCC_20, OC_0339 and UBC_17a.
Cavallo et al. (2024)
Gold sample.
Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.99 (50th percentile).
Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.99 (50th percentile).