UBC 77

0.57 UTI

0.44

C_N

1.0

C_dens

0.5

C_C3

0.46

C_lit

1.0

C_dup

N₅₀ (P>50% members) 44

Stellar density (N₅₀/rad) 10.5 [N/pc²]

C3 classification BB

C_N 0.44 Poorly populated
C_dens 1.0 Very dense
C_C3 0.5 Intermediate quality
C_lit 0.46 Poorly studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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UBC 77 is a poorly populated, very dense object of intermediate C3 quality. Its parallax locates it at a relatively close distance, below the mid-plane, affected by moderate extinction. It is catalogued as a near-solar metallicity, young cluster, but with a large variance across recent sources for the metallicity parameter (see Parameters). It is poorly studied in the literature.

Note: This object shares a small percentage of members with at least one entry reported in the same catalogue. See table with shared members information.

Relatively close Moderate extinction Near-solar metallicity Young

Palma et al. (2025)
Classified as genetic pair P247, along with UBC_76.

Cavallo et al. (2024)
Gold sample.

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

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.93 (50th percentile).

Data

🔍 Search references for UBC 77 in: SciX Simbad

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Reference	Year	RA [deg]	DEC [deg]	Plx [mas]	pmRA [mas/yr]	pmDE [mas/yr]	Rv [km/s]
UCC	99999–	89.183	16.993	0.597	0.312	-1.224	–
Almeida et al.	2025	89.207	16.987	–	–	–	–
Zhang et al.	2024	89.186	16.997	–	–	–	–
Hunt & Reffert	2024	89.186	16.997	0.576	0.338	-1.202	–
Cavallo et al.	2024	89.23	16.987	0.584	–	–	–
Hunt & Reffert	2023	89.186	16.997	0.576	0.338	-1.202	–
Dias et al.	2021	89.207	16.987	0.518	0.354	-1.207	–
Cantat-Gaudin et al.	2020	89.19	16.997	0.588	0.357	-1.239	–
Cantat-Gaudin & Anders	2020	89.19	16.997	0.588	0.357	-1.239	–
Castro-Ginard et al.	2019	89.213	17.0	0.587	0.323	-1.198	–

💡 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–	1.65	1.08	1.69	73	-0.108	338	–	–
Almeida et al.	2025	1.67	1.08	–	111	–	364	–	–
Zhang et al.	2024	–	–	–	–	-0.048⁽¹⁾	–	–	–
Hunt & Reffert	2024	–	–	–	–	–	311⁽¹⁾	–	–
Cavallo et al.	2024	1.63	1.20	–	39	-0.410	–	–	–
Hunt & Reffert	2023	1.65	0.76	1.69	96	–	–	–	–
Dias et al.	2021	1.67	1.08	–	111	-0.108	–	–	–
Cantat-Gaudin et al.	2020	1.67	0.55	–	50	–	–	–	–
Kounkel et al.	2020	1.63	1.24	–	47	–	–	–	–
Cantat-Gaudin & Anders	2020	1.62	–	–	–	–	–	–	–

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

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
UBC 76	13.6	89.02	17.28	0.58	0.13	-1.14	19.3	0.49

💡 Note: The % column shows the percentage of members that UBC 77 shares with each listed object.

Visualization

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