Theia 986
0.13
UTI
0.0
CN
0.1
Cdens
0.38
CC3
0.1
Clit
1.0
Cdup
Nm (P>50%)
24
Core radius and density
1.9 [pc], 0.5 [pc-2]
- CN 0.0 Sparse
- Cdens 0.1 Very loose
- CC3 0.38 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 986 is a sparse, very loose object of low 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, young cluster (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 | 125.669 | -42.474 | 1.299 | -7.889 | 8.665 | 21.759 |
| Yan et al. | 2026 | 125.647 | -42.446 | 1.295 | -7.982 | 8.667 | â |
| Hunt & Reffert | 2024 | 125.647 | -42.446 | 1.295 | -7.982 | 8.667 | 24.234 |
| Cavallo et al. | 2024 | 126.025 | -42.546 | 1.299 | â | â | â |
| Hunt & Reffert | 2023 | 125.647 | -42.446 | 1.295 | -7.982 | 8.667 | 24.234 |
| Kounkel & Covey | 2019 | 123.912 | -42.412 | 1.303 | â | â | 25.992 |
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 | 0.75 | 0.255 | 0.72 | 79 | -0.120 | 58 | â | â |
| Yan et al. | 2026 | â | â | â | 101 | â | â | â | â |
| Hunt & Reffert | 2024 | 0.73 | 0.17 | 0.72 | 79 | â | 58(1) | â | â |
| Cavallo et al. | 2024 | 0.79 | 0.34 | â | 40 | -0.120 | â | â | â |
| Hunt & Reffert | 2023 | 0.73 | 0.17 | 0.72 | 79 | â | â | â | â |
| Kounkel & Covey | 2019 | 0.77 | 0.53 | â | 595 | â | â | â | â |
(N): Indicates that there are N extra values assigned to this parameter in the corresponding reference.
Yan et al. (2026)
Number of WDs: expected from single-star evolution N=2, with probability of formation through binary evolution >=0.5 N=1.
Palma et al. (2025)
Part of multiple system G137, along with Theia_773, Theia_274, HSC_2082, HSC_2085 and Theia_2103.
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).