Theia 85
0.29
UTI
0.3
CN
0.45
Cdens
0.38
CC3
0.16
Clit
1.0
Cdup
Nm (P>50%)
30
Core radius and density
1.4 [pc], 2.2 [pc-2]
- CN 0.3 Poorly populated
- Cdens 0.45 Loose
- CC3 0.38 Low 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 85 is a poorly populated, loose object of low C3 quality. Its parallax locates it at a close distance, above the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, young cluster (see Parameters). It is rarely studied in the literature.
Note: This object shares a large percentage of members with 2 later reported entries. See table with shared members information.
Data
| Reference | Year | RA [deg] | DEC [deg] | Plx [mas] | pmRA [mas/yr] | pmDE [mas/yr] | Rv [km/s] |
|---|---|---|---|---|---|---|---|
| UCC | 99999â | 57.694 | 60.202 | 1.576 | -2.995 | -0.459 | -22.247 |
| Liu et al. | 2025 | 57.68 | 60.2 | 1.58 | -3.06 | -0.5 | -22.46 |
| Yang et al. | 2025 | 57.684 | 60.202 | â | â | â | â |
| Zhang et al. | 2024 | 57.684 | 60.202 | â | â | â | â |
| Swiggum et al. | 2024 | 57.684 | 60.202 | 1.583 | -3.058 | -0.497 | -22.245 |
| Cavallo et al. | 2024 | 58.114 | 59.798 | 1.583 | â | â | â |
| Hunt & Reffert | 2023 | 57.684 | 60.202 | 1.583 | -3.058 | -0.497 | -22.462 |
| Kounkel & Covey | 2019 | 56.275 | 59.933 | 1.494 | â | â | -9.639 |
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 | 0.62 | 0.59 | 0.56 | 52 | -0.210 | 178 | â | â |
| Liu et al. | 2025 | 0.95 | 0.35 | â | 33 | â | â | â | â |
| Yang et al. | 2025 | â | â | â | 58 | -0.210(3) | â | â | â |
| Zhang et al. | 2024 | â | â | â | â | -0.282(1) | â | â | â |
| Swiggum et al. | 2024 | 0.62 | â | â | 58 | â | 178 | â | â |
| Cavallo et al. | 2024 | 0.59 | 0.69 | â | 46 | -0.110 | â | â | â |
| Hunt & Reffert | 2023 | 0.60 | 0.82 | 0.56 | 58 | â | â | â | â |
| Kounkel & Covey | 2019 | 0.67 | 0.49 | â | 27 | 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) 184 along with HSC_1149, and as primordial binary cluster 340 along with Stock_23, and of multiple system 51 along with Stock_23 and HSC_1149.
Palma et al. (2025)
Classified as optical pair P27, along with HSC_1149.
Cavallo et al. (2024)
Gold sample.
Hunt & Reffert (2024)
Classified as moving group. CMD class: 1.00 (50th percentile).
Hunt & Reffert (2023)
Classified as open cluster. CMD class: 1.00 (50th percentile).