UBC 1557

0.56 UTI

0.46

C_N

1.0

C_dens

0.75

C_C3

0.3

C_lit

1.0

C_dup

N₅₀ (P>50% members) 46

Stellar density (N₅₀/rad) 18.5 [N/pc²]

C3 classification BA

C_N 0.46 Poorly populated
C_dens 1.0 Very dense
C_C3 0.75 High quality
C_lit 0.3 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 1557 is a poorly populated, very dense object of 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, young cluster, but with a large variance across recent sources for the distance parameter (see Parameters). It is poorly studied in the literature.

Note: This object shares a large percentage of members with a later reported entry. See table with shared members information.

Relatively close Moderate extinction Near-solar metallicity Young

Liu et al. (2025)
Classified as primordial binary cluster 385 along with UBC_1558.

Palma et al. (2025)
Part of multiple system G255, along with UBC_321, UBC_550 and UBC_1558.

Cavallo et al. (2024)
Gold sample.

Data

🔍 Search references for UBC 1557 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–	251.042	-45.53	0.388	-1.37	-2.53	-31.39
Hunt & Reffert	2024	251.05	-45.525	0.391	-1.358	-2.545	-12.95
Cavallo et al.	2024	251.032	-45.538	0.391	–	–	–
Hunt & Reffert	2023	251.05	-45.525	0.391	-1.358	-2.545	-12.95
Castro-Ginard et al.	2022	251.04	-45.53	0.39	-1.37	-2.54	–

💡 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–	2.45	2.76	1.44	46	-0.340	919	–	–
Liu et al.	2025	6.58	1.02	–	32	–	–	–	–
Hunt & Reffert	2024	–	–	–	–	–	919⁽¹⁾	–	–
Cavallo et al.	2024	1.73	3.29	–	59	-0.340	–	–	–
Hunt & Reffert	2023	2.31	2.90	1.44	69	–	–	–	–
Castro-Ginard et al.	2022	2.59	2.62	–	28	–	–	–	–

(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 1600	97.8	251.04	-45.53	0.39	-1.37	-2.53	-31.39	0.1

💡 Note: The % column shows the percentage of members that UBC 1557 shares with each listed object.

Visualization

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