HSC 2557

0.34 UTI

0.58

C_N

0.31

C_dens

0.75

C_C3

0.03

C_lit

1.0

C_dup

N_m (P>50%) 66

Core radius and density 1.5 [pc], 1.6 [pc^-2]

C3 classification AB

C_N 0.58 Moderately populated
C_dens 0.31 Loose
C_C3 0.75 High quality
C_lit 0.03 Rarely studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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HSC 2557 is a moderately populated, loose object of high C3 quality. Its parallax locates it at a moderate distance, near the mid-plane, affected by high extinction. It is catalogued as a massive, near-solar metallicity, intermediate-age cluster, but with a large variance across recent sources for the age parameter (see Parameters). It was recently reported in the literature.

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

Distant High extinction Massive Near-solar metallicity Intermediate age

Cavallo et al. (2024)
Silver sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.04 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.04 (50th percentile).

Data

🔍 Search references for HSC 2557 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–	196.375	-62.39	0.254	-7.535	-0.165	-41.942
Hunt & Reffert	2024	196.393	-62.389	0.238	-7.537	-0.192	-20.596
Cavallo et al.	2024	196.301	-62.38	0.243	–	–	–
Hunt & Reffert	2023	196.393	-62.389	0.238	-7.537	-0.192	-20.596

💡 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–	3.74	4.09	2.73	100	0.170	1527	–	–
Hunt & Reffert	2024	3.74	4.09	2.73	100	–	1527⁽¹⁾	–	–
Cavallo et al.	2024	3.33	3.63	–	339	0.170	–	–	–
Hunt & Reffert	2023	3.74	4.09	2.73	100	–	–	–	–

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

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
CWNU 3812	78.8	196.33	-62.39	0.25	-7.53	-0.16	-41.94	0.04

💡 Note: The % column shows the percentage of members that HSC 2557 shares with each listed object.

Visualization

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