HSC 1139
0.04
UTI
0.0
CN
0.02
Cdens
0.12
CC3
0.03
Clit
1.0
Cdup
Nm (P>50%)
23
Core radius and density
1.7 [pc], 0.1 [pc-2]
- CN 0.0 Sparse
- Cdens 0.02 Very loose
- CC3 0.12 Very low quality
- Clit 0.03 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 1139 is a sparse, very loose object of very low C3 quality. Its parallax locates it at a very close distance, above the mid-plane, affected by moderate extinction. It is catalogued as a near-solar metallicity, intermediate-age cluster, but with a large variance across recent sources for the metallicity parameter (see Parameters). It was recently reported in the literature.
â ī¸ Warning: the low UTI value and no obvious signs of duplication (Cdup=1.0) indicate that this is quite probably an asterism, moving group, or artifact, and not a real open cluster.
Data
| Reference | Year | RA [deg] | DEC [deg] | Plx [mas] | pmRA [mas/yr] | pmDE [mas/yr] | Rv [km/s] |
|---|---|---|---|---|---|---|---|
| UCC | 99999â | 64.266 | 65.82 | 2.332 | -7.096 | -0.552 | -15.918 |
| Yang et al. | 2025 | 63.729 | 65.509 | â | â | â | â |
| Cavallo et al. | 2024 | 64.583 | 66.096 | 2.333 | â | â | â |
| Hunt & Reffert | 2023 | 63.729 | 65.509 | 2.357 | -7.089 | -0.516 | -13.033 |
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 | 0.435 | 1.27 | 0.94 | 133 | 0.200 | â | â | â |
| Yang et al. | 2025 | â | â | â | 132 | 0.020(3) | â | â | â |
| Cavallo et al. | 2024 | 0.45 | 1.38 | â | 224 | 0.380 | â | â | â |
| Hunt & Reffert | 2023 | 0.42 | 1.16 | 0.94 | 133 | â | â | â | â |
(N): Indicates that there are N extra values assigned to this parameter in the corresponding reference.
Palma et al. (2025)
Classified as optical pair P124, along with UPK_292.
Cavallo et al. (2024)
Gold sample.
Hunt & Reffert (2024)
Classified as moving group. CMD class: 0.62 (50th percentile).
Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.62 (50th percentile).