HSC 273

0.06 UTI

0.0

C_N

0.02

C_dens

0.25

C_C3

0.03

C_lit

0.88

C_dup

N_m (P>50%) 19

Core radius and density 2.8 [pc], 0.08 [pc^-2]

C3 classification DB

C_N 0.0 Sparse
C_dens 0.02 Very loose
C_C3 0.25 Low quality
C_lit 0.03 Rarely studied
C_dup 0.88 Very likely unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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HSC 273 is a sparse, very loose object of low C3 quality. Its parallax locates it at a moderate distance, below the mid-plane, affected by high extinction. It is catalogued as a massive, metal-poor, young cluster (see Parameters). It was recently reported in the literature.

Note: This is very likely a unique object, which shares a small percentage of members with at least one previously reported entry. See table with shared members information.

⚠️ Warning: the low UTI value and no obvious signs of duplication (C_dup=0.88) indicate that this is quite probably an asterism, moving group, or artifact, and not a real open cluster.

Distant High extinction Massive Metal-poor Young

Cavallo et al. (2024)
Bronze sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.06 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.06 (50th percentile).

Data

🔍 Search references for HSC 273 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–	281.082	-5.454	0.235	-1.205	-3.096	38.573
Hunt & Reffert	2024	281.107	-5.445	0.246	-1.204	-3.11	38.856
Cavallo et al.	2024	281.191	-5.451	0.246	–	–	–
Hunt & Reffert	2023	281.107	-5.445	0.246	-1.204	-3.11	38.856

💡 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–	3.65	3.32	2.85	23	-0.860	2022	–	–
Hunt & Reffert	2024	3.65	3.32	2.85	23	–	2022⁽¹⁾	–	–
Cavallo et al.	2024	2.59	3.88	–	26	-0.860	–	–	–
Hunt & Reffert	2023	3.65	3.32	2.85	23	–	–	–	–

(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 2662	12.0	281.27	-5.46	0.26	-1.33	-3.2	55.52	0.27

💡 Note: The % column shows the percentage of members that HSC 273 shares with each listed object.

Visualization

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