HSC 553

0.33 UTI

0.4

C_N

0.35

C_dens

0.75

C_C3

0.06

C_lit

1.0

C_dup

N_m (P>50%) 40

Core radius and density 1.5 [pc], 1.7 [pc^-2]

C3 classification AB

C_N 0.4 Poorly populated
C_dens 0.35 Loose
C_C3 0.75 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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HSC 553 is a poorly populated, loose object of high C3 quality. Its parallax locates it at a moderate distance, above the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, old cluster, but with a large variance across recent sources for the absorption parameter (see Parameters). It was recently reported in the literature.

Relatively close Low extinction Near-solar metallicity Old

Cavallo et al. (2024)
Gold sample.

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

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.93 (50th percentile).

Data

🔍 Search references for HSC 553 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–	296.088	34.889	0.43	-1.133	-4.234	-14.811
Hu & Soubiran	2025	296.099	34.879	–	–	–	–
Hunt & Reffert	2024	296.074	34.902	0.426	-1.152	-4.254	-19.32
Cavallo et al.	2024	296.099	34.879	0.425	–	–	–
Hunt & Reffert	2023	296.074	34.902	0.426	-1.152	-4.254	-19.32

💡 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–	2.19	0.26	0.4	1285	-0.175	73	–	–
Hu & Soubiran	2025	–	–	–	–	-0.250⁽⁵⁾	–	–	–
Hunt & Reffert	2024	2.19	0.26	0.40	1285	–	73⁽¹⁾	–	–
Cavallo et al.	2024	2.32	1.17	–	537	-0.100	–	–	–
Hunt & Reffert	2023	2.19	0.26	0.40	1285	–	–	–	–

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

Visualization

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