Theia 199
0.31
UTI
0.44
CN
0.1
Cdens
0.75
CC3
0.13
Clit
1.0
Cdup
Nm (P>50%)
44
Core radius and density
2.8 [pc], 0.5 [pc-2]
- CN 0.44 Poorly populated
- Cdens 0.1 Very loose
- CC3 0.75 High quality
- Clit 0.13 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 199 is a poorly populated, very loose object of high 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 a later reported entry. 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 | 309.434 | 54.512 | 1.222 | -3.096 | -6.732 | -20.545 |
| Yan et al. | 2026 | 309.382 | 54.688 | 1.206 | -3.098 | -6.839 | â |
| Hunt & Reffert | 2024 | 309.382 | 54.688 | 1.206 | -3.098 | -6.839 | -24.486 |
| Cavallo et al. | 2024 | 309.22 | 53.817 | 1.211 | â | â | â |
| Hunt & Reffert | 2023 | 309.382 | 54.688 | 1.206 | -3.098 | -6.839 | -24.486 |
| Kounkel & Covey | 2019 | 309.229 | 53.861 | 1.194 | â | â | -12.134 |
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 | 0.83 | 0.46 | 1.09 | 39 | 0.260 | 50 | â | â |
| Yan et al. | 2026 | â | â | â | 34 | â | â | â | â |
| Liu et al. | 2025 | 0.83 | 0.16 | â | 62 | â | â | â | â |
| Hunt & Reffert | 2024 | 0.79 | 0.46 | 1.09 | 34 | â | 50(1) | â | â |
| Cavallo et al. | 2024 | 0.84 | 0.68 | â | 44 | 0.260 | â | â | â |
| Hunt & Reffert | 2023 | 0.79 | 0.46 | 1.09 | 34 | â | â | â | â |
| Kounkel & Covey | 2019 | 0.84 | 0.61 | â | 79 | 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=1, with probability of formation through binary evolution >=0.5 N=0.
Liu et al. (2025)
Classified as primordial binary cluster 349 along with UPK_137.
Palma et al. (2025)
Classified as optical pair P572, along with UPK_137.
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).