Theia 283
0.07
UTI
0.0
CN
0.02
Cdens
0.12
CC3
0.1
Clit
1.0
Cdup
Nm (P>50%)
24
Core radius and density
6.3 [pc], 0.09 [pc-2]
- CN 0.0 Sparse
- Cdens 0.02 Very loose
- CC3 0.12 Very low quality
- Clit 0.1 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 283 is a sparse, very loose object of very low C3 quality. Its parallax locates it at a relatively close distance, near the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, intermediate-age cluster (see Parameters). It is rarely studied in the literature.
Note: This object shares a small percentage of members with a later reported entry. See table with shared members information.
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 | 109.042 | -18.495 | 0.98 | -3.399 | 4.049 | 8.959 |
| Hunt & Reffert | 2024 | 108.943 | -18.58 | 0.948 | -3.368 | 3.993 | 24.27 |
| Cavallo et al. | 2024 | 109.199 | -18.659 | 0.951 | â | â | â |
| Hunt & Reffert | 2023 | 108.943 | -18.58 | 0.948 | -3.368 | 3.993 | 24.27 |
| Kounkel & Covey | 2019 | 107.953 | -18.061 | 1.212 | â | â | 17.221 |
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 | 0.99 | 0.21 | 0.78 | 158 | -0.300 | 70 | â | â |
| Liu et al. | 2025 | 1.37 | 0.17 | â | 66 | â | â | â | â |
| Hunt & Reffert | 2024 | 0.99 | 0.21 | 0.78 | 186 | â | 70(1) | â | â |
| Cavallo et al. | 2024 | 1.04 | 0.81 | â | 158 | -0.300 | â | â | â |
| Hunt & Reffert | 2023 | 0.99 | 0.21 | 0.78 | 186 | â | â | â | â |
| Kounkel & Covey | 2019 | 0.83 | 0.28 | â | 92 | 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) 350 along with UPK_470.
Palma et al. (2025)
Part of multiple system G242, along with ASCC_36 and UPK_470.
Cavallo et al. (2024)
Gold sample.
Hunt & Reffert (2024)
Classified as open cluster. CMD class: 1.00 (50th percentile).
Hunt & Reffert (2023)
Classified as open cluster. CMD class: 1.00 (50th percentile).