UPK 312

0.41 UTI

0.27

C_N

0.37

C_dens

0.5

C_C3

0.45

C_lit

1.0

C_dup

N_m (P>50%) 27

Core radius and density 1.1 [pc], 1.9 [pc^-2]

C3 classification BB

C_N 0.27 Poorly populated
C_dens 0.37 Loose
C_C3 0.5 Intermediate quality
C_lit 0.45 Poorly studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

MOCA 🔍 CDS 🔍 Simbad 🔍 CDS (α, δ) 🔍 Simbad (α, δ)

Overview

ℹ️

UPK 312 is a poorly populated, loose object of intermediate 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, intermediate-age cluster, but with a large variance across recent sources for the absorption, age, and metallicity parameters (see Parameters). It is poorly studied in the literature.

Close Low extinction Near-solar metallicity Intermediate age

Liu et al. (2025)
Classified as tidal capture (resonant trapping binary) 97 along with CWNU_1137.

Palma et al. (2025)
Classified as optical pair P90, along with CWNU_1137.

Almeida et al. (2025)
Mass determination: intermediate fit. Isochrone match: good fit.

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 1.00 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 1.00 (50th percentile).

Piecka & Paunzen (2021)
Belongs to cluster aggregate 'Agg04' along with Alessi 2.

Data

🔍 Search references for UPK 312 in: SciX Simbad

ℹ️

Reference	Year	RA [deg]	DEC [deg]	Plx [mas]	pmRA [mas/yr]	pmDE [mas/yr]	Rv [km/s]
UCC	99999–	68.064	56.056	1.425	0.122	-0.814	-6.912
Li et al.	2025	68.037	56.066	1.406	0.179	-0.73	–
Almeida et al.	2025	67.894	56.134	–	–	–	–
Alfonso et al.	2024	68.117	56.014	1.389	0.152	-0.784	–
Zhang et al.	2024	68.055	56.05	–	–	–	–
Hunt & Reffert	2024	68.055	56.05	1.424	0.162	-0.824	-7.187
Cavallo et al.	2024	67.961	56.033	1.421	–	–	–
Hunt & Reffert	2023	68.055	56.05	1.424	0.162	-0.824	-7.187
Almeida et al.	2023	67.627	56.171	–	–	–	–
He et al.	2022	68.039	56.084	1.425	0.134	-0.817	–
Tarricq et al.	2022	67.936	56.032	1.452	0.13	-0.806	–
Jadhav & Subramaniam	2021	68.037	56.066	–	–	–	–
Dias et al.	2021	67.894	56.134	1.409	0.169	-0.729	–
Cantat-Gaudin et al.	2020	68.037	56.066	1.406	0.179	-0.73	–
Cantat-Gaudin & Anders	2020	68.063	56.071	1.406	0.184	-0.732	–
Sim et al.	2019	68.002	56.103	–	0.2	-0.73	–

💡 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]	B_frac	BSS
UCC	99999–	0.7	0.89	1.32	463	0.009	67	0.7	0
Liu et al.	2025	0.70	0.17	–	166	–	–	–	–
Li et al.	2025	0.58	0.98	–	618	-0.277	–	–	–
Almeida et al.	2025	0.68	0.89	–	151	–	46	–	–
Alfonso et al.	2024	0.72	0.54	–	757	0.160	–	–	–
Zhang et al.	2024	–	–	–	–	-0.143⁽¹⁾	–	–	–
Hunt & Reffert	2024	0.68	0.96	1.32	124	–	47⁽¹⁾	–	–
Cavallo et al.	2024	0.70	0.87	–	309	0.430	–	–	–
Hunt & Reffert	2023	0.68	0.96	1.32	124	–	–	–	–
Almeida et al.	2023	0.68	1.28	–	516	-0.187	87⁽¹⁾	0.70	–
He et al.	2022	–	1.25	–	447	–	–	–	–
Tarricq et al.	2022	0.70	–	–	513	–	–	–	–
Jadhav & Subramaniam	2021	0.72	0.54	–	479	–	103	–	0⁽¹⁾
Dias et al.	2021	0.68	0.89	–	151	0.160	–	–	–
Cantat-Gaudin et al.	2020	0.72	0.54	–	479	–	–	–	–
Cantat-Gaudin & Anders	2020	0.70	–	–	–	–	–	–	–
Sim et al.	2019	0.70	–	–	794	–	–	–	–

(N): Indicates that there are N extra values assigned to this parameter in the corresponding reference.

Visualization

ℹ️

1 2 3