Theia 19
0.40
UTI
0.0
CN
1.0
Cdens
0.75
CC3
0.13
Clit
1.0
Cdup
Nm (P>50%)
21
Core radius and density
0.8 [pc], 5.1 [pc-2]
- CN 0.0 Sparse
- Cdens 1.0 Very dense
- 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 19 is a sparse, very dense object of high C3 quality. Its parallax locates it at a close distance, above the mid-plane, affected by moderate extinction. It is catalogued as a near-solar metallicity, very young cluster, but with a large variance across recent sources for the absorption parameter (see Parameters). It is rarely studied in the literature.
Note: This object shares a significant 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 | 3.213 | 65.576 | 1.395 | 2.397 | -2.431 | -12.653 |
| Hunt & Reffert | 2024 | 3.221 | 65.566 | 1.387 | 2.423 | -2.396 | -12.631 |
| Cavallo et al. | 2024 | 3.389 | 65.673 | 1.381 | â | â | â |
| Hunt & Reffert | 2023 | 3.221 | 65.566 | 1.387 | 2.423 | -2.396 | -12.631 |
| He et al. | 2022 | 3.116 | 65.692 | 1.398 | 2.466 | -2.387 | â |
| Kounkel & Covey | 2019 | 4.096 | 65.559 | 1.331 | â | â | -19.922 |
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 | 2.275 | 1.55 | 3 | 0.290 | 98 | â | â |
| Liu et al. | 2025 | 1.10 | 0.37 | â | 2 | â | â | â | â |
| Hunt & Reffert | 2024 | 0.69 | 3.01 | 1.55 | 4 | â | 98(1) | â | â |
| Cavallo et al. | 2024 | 0.99 | 2.12 | â | 2 | 0.290 | â | â | â |
| Hunt & Reffert | 2023 | 0.69 | 3.01 | 1.55 | 4 | â | â | â | â |
| He et al. | 2022 | â | 1.90 | â | 2 | â | â | â | â |
| Kounkel & Covey | 2019 | 0.75 | 2.43 | â | 9 | 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 primordial binary cluster 304 along with OC_0227.
Palma et al. (2025)
Classified as genetic pair P240, along with OC_0227.
Cavallo et al. (2024)
Bronze sample.
Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.85 (50th percentile).
Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.85 (50th percentile).