UBC 273

0.43 UTI

0.45

C_N

0.61

C_dens

0.75

C_C3

0.16

C_lit

1.0

C_dup

N_m (P>50%) 45

Core radius and density 1.2 [pc], 3.1 [pc^-2]

C3 classification AB

C_N 0.45 Poorly populated
C_dens 0.61 Moderately dense
C_C3 0.75 High quality
C_lit 0.16 Rarely studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

ℹ️

UBC 273 is a poorly populated, moderately dense object of high C3 quality. Its parallax locates it at a moderate distance, near the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, young cluster, but with a large variance across recent sources for the age parameter (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.

Relatively close Low extinction Near-solar metallicity Young

Liu et al. (2025)
Classified as tidal capture (resonant trapping binary) 377 along with UBC_661.

Palma et al. (2025)
Classified as optical pair P74, along with UBC_661.

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).

Data

🔍 Search references for UBC 273 in: SciX Simbad

ℹ️

Reference	Year	RA [deg]	DEC [deg]	Plx [mas]	pmRA [mas/yr]	pmDE [mas/yr]	Rv [km/s]
UCC	99999–	170.312	-60.556	0.43	-6.348	1.155	–
Hunt & Reffert	2024	170.317	-60.565	0.426	-6.339	1.206	–
Cavallo et al.	2024	170.303	-60.563	0.427	–	–	–
Hunt & Reffert	2023	170.317	-60.565	0.426	-6.339	1.206	–
Cantat-Gaudin et al.	2020	170.302	-60.568	0.428	-6.328	1.131	–
Castro-Ginard et al.	2020	170.309	-60.565	0.43	-6.314	1.148	–

💡 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–	2.18	0.875	0.89	76	0.240	391	–	–
Liu et al.	2025	2.96	0.37	–	102	–	–	–	–
Hunt & Reffert	2024	2.18	1.17	0.89	50	–	391⁽¹⁾	–	–
Cavallo et al.	2024	1.80	0.51	–	389	0.240	–	–	–
Hunt & Reffert	2023	2.18	1.17	0.89	50	–	–	–	–
Cantat-Gaudin et al.	2020	2.20	0.73	–	46	–	–	–	–
Kounkel et al.	2020	1.63	1.02	–	309	–	–	–	–

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

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
CWWDL 2215	84.4	170.31	-60.56	0.44	-6.34	1.19	1.71	0.04
LISC 2337	75.6	170.32	-60.56	0.44	-6.35	1.2	-3.78	0.13

💡 Note: The % column shows the percentage of members that UBC 273 shares with each listed object.

Visualization

ℹ️

1 2 3