HSC 2139
0.30
UTI
0.52
CN
0.23
Cdens
0.75
CC3
0.0
Clit
1.0
Cdup
Stellar density (N50/rad)
1.1 [N/pc2]
- CN 0.52 Moderately populated
- Cdens 0.23 Very loose
- CC3 0.75 High quality
- Clit 0.0 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
HSC 2139 is a moderately populated, very loose object of 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, but with a large variance across recent sources for the absorption parameter (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 | 127.485 | -49.771 | 5.285 | -7.944 | 7.873 | 20.789 |
| Cavallo et al. | 2024 | 127.318 | -49.919 | 5.294 | â | â | â |
| Hunt & Reffert | 2023 | 128.381 | -47.518 | 5.308 | -7.866 | 7.974 | 21.108 |
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 | 0.19 | 0.12 | 0.33 | 17 | -0.140 | â | â | â |
| Liu et al. | 2025 | 0.18 | 0.04 | â | 38 | â | â | â | â |
| Cavallo et al. | 2024 | 0.19 | 0.54 | â | 17 | -0.140 | â | â | â |
| Hunt & Reffert | 2023 | 0.19 | 0.12 | 0.33 | 12 | â | â | â | â |
Liu et al. (2025)
Classified as primordial binary cluster 217 along with HSC_2068.
Palma et al. (2025)
Part of multiple system G138, along with HSC_2068, HSC_2156 and Platais_9.
Cavallo et al. (2024)
Gold sample.
Hunt & Reffert (2024)
Classified as a moving group.