Theia 1083
0.13
UTI
0.0
CN
0.16
Cdens
0.25
CC3
0.13
Clit
1.0
Cdup
Nm (P>50%)
24
Core radius and density
1.6 [pc], 0.8 [pc-2]
- CN 0.0 Sparse
- Cdens 0.16 Very loose
- CC3 0.25 Low quality
- Clit 0.13 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
Theia 1083 is a sparse, very loose object of low C3 quality. Its parallax locates it at a 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 and metallicity parameters (see Parameters). It is rarely studied 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 | 69.267 | 48.431 | 1.327 | 0.537 | -4.676 | -10.407 |
| Hu & Soubiran | 2025 | 69.576 | 48.308 | â | â | â | â |
| Zhang et al. | 2024 | 69.253 | 48.524 | â | â | â | â |
| Hunt & Reffert | 2024 | 69.253 | 48.524 | 1.314 | 0.57 | -4.659 | -18.855 |
| Cavallo et al. | 2024 | 69.576 | 48.308 | 1.318 | â | â | â |
| Hunt & Reffert | 2023 | 69.253 | 48.524 | 1.314 | 0.57 | -4.659 | -18.855 |
| Kounkel & Covey | 2019 | 69.715 | 47.694 | 1.167 | â | â | -9.595 |
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 | 0.745 | 1.56 | 1.02 | 339 | -0.050 | 72 | â | â |
| Hu & Soubiran | 2025 | â | â | â | â | -0.050(5) | â | â | â |
| Zhang et al. | 2024 | â | â | â | â | -0.281(1) | â | â | â |
| Hunt & Reffert | 2024 | 0.72 | 1.71 | 1.02 | 153 | â | 72(1) | â | â |
| Cavallo et al. | 2024 | 0.77 | 1.41 | â | 525 | 0.560 | â | â | â |
| Hunt & Reffert | 2023 | 0.72 | 1.71 | 1.02 | 152 | â | â | â | â |
| Kounkel & Covey | 2019 | 0.86 | 1.40 | â | 635 | â | â | â | â |
(N): Indicates that there are N extra values assigned to this parameter in the corresponding reference.
Palma et al. (2025)
Part of multiple system G106, along with CWNU_1086, Theia_47, UPK_325, HSC_1210 and HSC_1205.
Cavallo et al. (2024)
Gold sample.
Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.95 (50th percentile).
Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.95 (50th percentile).