HSC 2604

0.17 UTI

0.28

C_N

0.02

C_dens

0.5

C_C3

0.03

C_lit

1.0

C_dup

N_m (P>50%) 28

Core radius and density 6.8 [pc], 0.1 [pc^-2]

C3 classification BB

C_N 0.28 Poorly populated
C_dens 0.02 Very loose
C_C3 0.5 Intermediate 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 2604 is a poorly populated, very loose object of intermediate C3 quality. Its parallax locates it at a moderate distance, near the mid-plane, affected by high extinction. It is catalogued as a metal-rich, young 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.

⚠️ Warning: the low UTI value and no obvious signs of duplication (C_dup=1.0) indicate that this is quite probably an asterism, moving group, or artifact, and not a real open cluster.

Distant High extinction Metal-rich Young

Cavallo et al. (2024)
Silver sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.07 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.07 (50th percentile).

Data

🔍 Search references for HSC 2604 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–	205.071	-62.175	0.279	-4.927	-2.058	–
Hunt & Reffert	2024	205.194	-62.202	0.274	-4.946	-2.058	–
Cavallo et al.	2024	205.114	-62.157	0.275	–	–	–
Hunt & Reffert	2023	205.194	-62.202	0.274	-4.946	-2.058	–

💡 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–	3.45	3.08	2.32	27	0.690	308	–	–
Hunt & Reffert	2024	3.45	3.07	2.32	27	–	308⁽¹⁾	–	–
Cavallo et al.	2024	3.10	3.53	–	141	0.690	–	–	–
Hunt & Reffert	2023	3.45	3.08	2.32	27	–	–	–	–

(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 3638	85.7	204.98	-62.16	0.28	-4.92	-2.06	–	0.02

💡 Note: The % column shows the percentage of members that HSC 2604 shares with each listed object.

Visualization

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