Theia 2151
0.31
UTI
0.0
CN
0.32
Cdens
0.75
CC3
0.25
Clit
1.0
Cdup
Stellar density (N50/rad)
1.6 [N/pc2]
- CN 0.0 Sparse
- Cdens 0.32 Loose
- CC3 0.75 High quality
- Clit 0.25 Poorly 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
Theia 2151 is a sparse, loose object of high C3 quality. Its parallax locates it at a relatively close distance, near 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 age 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 | 162.521 | -59.783 | 0.544 | -6.702 | 2.402 | 23.084 |
| Hunt & Reffert | 2024 | 162.392 | -59.731 | 0.544 | -6.716 | 2.41 | 49.184 |
| Cavallo et al. | 2024 | 162.647 | -59.829 | 0.544 | â | â | â |
| Hunt & Reffert | 2023 | 162.392 | -59.731 | 0.544 | -6.716 | 2.41 | 49.184 |
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 | 1.73 | 1.12 | 0.78 | 249 | -0.170 | 114 | â | â |
| Liu et al. | 2025 | 2.78 | 0.42 | â | 78 | â | â | â | â |
| Hunt & Reffert | 2024 | â | â | â | â | â | 114(1) | â | â |
| Cavallo et al. | 2024 | 1.70 | 1.25 | â | 295 | -0.170 | â | â | â |
| Hunt & Reffert | 2023 | 1.73 | 1.12 | 0.78 | 249 | 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 tidal capture (resonant trapping binary) 361 along with UBC_502.
Palma et al. (2025)
Classified as optical pair P171, along with UBC_502.
Cavallo et al. (2024)
Gold sample.