Theia 202
0.14
UTI
0.0
CN
0.02
Cdens
0.5
CC3
0.1
Clit
1.0
Cdup
Nm (P>50%)
22
Core radius and density
4.1 [pc], 0.1 [pc-2]
- CN 0.0 Sparse
- Cdens 0.02 Very loose
- CC3 0.5 Intermediate 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 202 is a sparse, very loose object of intermediate C3 quality. Its parallax locates it at a close distance, below the mid-plane, affected by moderate extinction. It is catalogued as a near-solar metallicity, young cluster, but with a large variance across recent sources for the absorption parameter (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 | 290.964 | -2.74 | 1.18 | -0.553 | -2.279 | 0.356 |
| Zhang et al. | 2024 | 290.978 | -2.988 | â | â | â | â |
| Cavallo et al. | 2024 | 291.02 | -2.414 | 1.189 | â | â | â |
| Hunt & Reffert | 2023 | 290.978 | -2.988 | 1.178 | -0.523 | -2.256 | -1.512 |
| Kounkel & Covey | 2019 | 291.485 | -1.374 | 1.176 | â | â | 16.541 |
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 | 0.835 | 1.06 | 1.37 | 66 | -0.172 | â | â | â |
| Liu et al. | 2025 | 1.04 | 0.31 | â | 63 | â | â | â | â |
| Zhang et al. | 2024 | â | â | â | â | -0.124(1) | â | â | â |
| Cavallo et al. | 2024 | 0.82 | 1.48 | â | 56 | -0.220 | â | â | â |
| Hunt & Reffert | 2023 | 0.81 | 1.14 | 1.37 | 112 | â | â | â | â |
| Kounkel & Covey | 2019 | 0.85 | 0.98 | â | 70 | 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) 167 along with HSC_330.
Palma et al. (2025)
Classified as tidal capture (resonant trapping pair) P48, along with HSC_330.
Cavallo et al. (2024)
Gold sample.
Hunt & Reffert (2024)
Classified as moving group. CMD class: 0.98 (50th percentile).
Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.98 (50th percentile).