HSC 397

0.24 UTI

0.45

C_N

0.2

C_dens

0.5

C_C3

0.03

C_lit

1.0

C_dup

N_m (P>50%) 45

Core radius and density 2.9 [pc], 1.0 [pc^-2]

C3 classification BB

C_N 0.45 Poorly populated
C_dens 0.2 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 397 is a poorly populated, very loose object of intermediate C3 quality. Its parallax locates it at a moderate distance, below the mid-plane, affected by very high extinction. It is catalogued as a massive, near-solar metallicity, young cluster (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 Very high extinction Massive Near-solar metallicity Young

Cavallo et al. (2024)
Silver sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.57 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.57 (50th percentile).

Data

🔍 Search references for HSC 397 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–	290.517	11.529	0.248	-1.889	-5.228	84.875
Hunt & Reffert	2024	290.502	11.531	0.256	-1.892	-5.223	84.888
Cavallo et al.	2024	290.501	11.533	0.255	–	–	–
Hunt & Reffert	2023	290.502	11.531	0.256	-1.892	-5.223	84.888

💡 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–	3.47	5.19	2.2	44	0.250	1025	–	–
Hunt & Reffert	2024	3.47	5.19	2.20	44	–	1025⁽¹⁾	–	–
Cavallo et al.	2024	4.21	4.74	–	36	0.250	–	–	–
Hunt & Reffert	2023	3.47	5.19	2.20	44	–	–	–	–

(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 3178	93.3	290.52	11.53	0.24	-1.89	-5.22	84.87	0.04

💡 Note: The % column shows the percentage of members that HSC 397 shares with each listed object.

Visualization

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