UBC 1551

0.56 UTI

0.68

C_N

1.0

C_dens

1.0

C_C3

0.06

C_lit

1.0

C_dup

N₅₀ (P>50% members) 87

Stellar density (N₅₀/rad) 7.7 [N/pc²]

C3 classification AA

C_N 0.68 Moderately populated
C_dens 1.0 Very dense
C_C3 1.0 Very high quality
C_lit 0.06 Rarely studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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UBC 1551 is a moderately populated, very dense object of very high C3 quality. Its parallax locates it at a moderate distance, near the mid-plane, affected by moderate extinction. It is catalogued as a near-solar metallicity, intermediate-age cluster (see Parameters). It is rarely studied in the literature.

Relatively close Moderate extinction Near-solar metallicity Intermediate age

Palma et al. (2025)
Classified as optical pair P399, along with Hogg_21.

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.17 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.17 (50th percentile).

Data

🔍 Search references for UBC 1551 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–	250.548	-47.463	0.372	-2.196	-3.467	-21.316
Hunt & Reffert	2024	250.548	-47.481	0.366	-2.217	-3.497	-21.32
Cavallo et al.	2024	250.567	-47.464	0.368	–	–	–
Hunt & Reffert	2023	250.548	-47.481	0.366	-2.217	-3.497	-21.32
Castro-Ginard et al.	2022	250.58	-47.46	0.38	-2.2	-3.47	–

💡 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–	2.39	2.06	2.56	196	-0.090	893	–	–
Hunt & Reffert	2024	–	–	–	–	–	893⁽¹⁾	–	–
Cavallo et al.	2024	1.92	2.40	–	214	-0.090	–	–	–
Hunt & Reffert	2023	2.39	2.06	2.56	175	–	–	–	–
Castro-Ginard et al.	2022	2.72	1.52	–	196	–	–	–	–

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

Visualization

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