OCSN 98
0.60
UTI
0.76
CN
1.0
Cdens
1.0
CC3
0.11
Clit
1.0
Cdup
Stellar density (N50/rad)
22.9 [N/pc2]
- CN 0.76 Rich
- Cdens 1.0 Very dense
- CC3 1.0 Very high quality
- Clit 0.11 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 98 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 very 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 | 241.26 | -19.698 | 6.561 | -9.892 | -21.689 | -7.92 |
| Liu et al. | 2025 | 241.3 | -19.74 | 6.56 | -9.99 | -21.7 | -10.87 |
| Swiggum et al. | 2024 | 241.301 | -19.743 | 6.564 | -9.986 | -21.698 | -4.012 |
| Cavallo et al. | 2024 | 241.261 | -19.717 | 6.564 | â | â | â |
| Hunt & Reffert | 2023 | 241.301 | -19.743 | 6.564 | -9.986 | -21.698 | -10.865 |
| Qin et al. | 2023 | 241.3 | -19.78 | 6.6 | -9.86 | -21.76 | -6.78 |
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 | 0.15 | 0.44 | 0.74 | 4 | -0.370 | 54 | â | â |
| Liu et al. | 2025 | 0.24 | 0.20 | â | 3 | â | â | â | â |
| Swiggum et al. | 2024 | 0.15 | â | â | 4 | â | 54 | â | â |
| Cavallo et al. | 2024 | 0.15 | 1.49 | â | 8 | -0.370 | â | â | â |
| Hunt & Reffert | 2023 | 0.15 | 0.56 | 0.74 | 4 | â | â | â | â |
| Qin et al. | 2023 | 0.17 | 0.32 | â | 7 | â | â | â | â |
Liu et al. (2025)
Classified as primordial binary cluster 253 along with HSC_2907, and as primordial binary cluster 326 along with OCSN_96, and of multiple system 72 along with OCSN_96, HSC_2907, HSC_2931, OCSN_100 and HSC_2919.
Palma et al. (2025)
Part of multiple system G172, along with HSC_2907, OCSN_96, HSC_2931, HSC_2919 and OCSN_100.
Cavallo et al. (2024)
Silver sample.
Hunt & Reffert (2024)
Classified as moving group. CMD class: 0.99 (50th percentile).