Theia 387
0.41
UTI
0.75
CN
0.24
Cdens
0.75
CC3
0.16
Clit
1.0
Cdup
Nm (P>50%)
105
Core radius and density
2.9 [pc], 1.2 [pc-2]
- CN 0.75 Rich
- Cdens 0.24 Very loose
- CC3 0.75 High quality
- Clit 0.16 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 387 is a rich, very loose object of high C3 quality. Its parallax locates it at a 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.
Data
| Reference | Year | RA [deg] | DEC [deg] | Plx [mas] | pmRA [mas/yr] | pmDE [mas/yr] | Rv [km/s] |
|---|---|---|---|---|---|---|---|
| UCC | 99999â | 79.246 | 37.256 | 1.868 | -0.556 | -9.224 | 5.657 |
| Yang et al. | 2025 | 79.153 | 37.199 | â | â | â | â |
| Zhang et al. | 2024 | 79.153 | 37.199 | â | â | â | â |
| Hunt & Reffert | 2024 | 79.153 | 37.199 | 1.848 | -0.474 | -9.146 | 5.615 |
| Cavallo et al. | 2024 | 79.251 | 37.278 | 1.853 | â | â | â |
| Hunt & Reffert | 2023 | 79.153 | 37.199 | 1.848 | -0.474 | -9.146 | 5.615 |
| He et al. | 2022 | 79.149 | 37.343 | 1.871 | -0.55 | -9.243 | â |
| Kounkel & Covey | 2019 | 79.353 | 37.337 | 1.794 | â | â | 1.571 |
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 | 0.53 | 0.56 | 0.88 | 110 | -0.080 | 109 | â | â |
| Yang et al. | 2025 | â | â | â | 110 | -0.090(3) | â | â | â |
| Zhang et al. | 2024 | â | â | â | â | -0.063(1) | â | â | â |
| Hunt & Reffert | 2024 | 0.51 | 0.49 | 0.88 | 110 | â | 109(1) | â | â |
| Cavallo et al. | 2024 | 0.55 | 0.87 | â | 59 | -0.080 | â | â | â |
| Hunt & Reffert | 2023 | 0.51 | 0.49 | 0.88 | 110 | â | â | â | â |
| He et al. | 2022 | â | 0.85 | â | 63 | â | â | â | â |
| Kounkel & Covey | 2019 | 0.56 | 0.56 | â | 126 | 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 P176, along with Theia_943.
Cavallo et al. (2024)
Gold sample.
Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.99 (50th percentile).
Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.99 (50th percentile).