HSC 1630

0.19 UTI

0.72

C_N

0.12

C_dens

0.12

C_C3

0.0

C_lit

1.0

C_dup

N₅₀ (P>50% members) 95

Stellar density (N₅₀/rad) 0.6 [N/pc²]

C3 classification DC

C_N 0.72 Moderately populated
C_dens 0.12 Very loose
C_C3 0.12 Very low quality
C_lit 0.0 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 1630 is a moderately populated, very loose object of very low C3 quality. Its parallax locates it at a very close distance, near the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, intermediate-age cluster, but with a large variance across recent sources for the absorption parameter (see Parameters). It was recently reported in the literature.

⚠️ 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.

Very close Low extinction Near-solar metallicity Intermediate age

Palma et al. (2025)
Part of multiple system G123, along with HSC_1542 and HSC_1715.

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as a moving group.

Data

🔍 Search references for HSC 1630 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–	83.21	2.514	6.633	-16.703	-10.848	6.635
Zhang et al.	2024	89.353	0.105	–	–	–	–
Cavallo et al.	2024	80.595	3.194	6.915	–	–	–
Hunt & Reffert	2023	89.353	0.105	6.877	-16.428	-11.615	14.905

💡 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–	0.14	0.355	0.53	132	-0.043	–	–	–
Zhang et al.	2024	–	–	–	–	-0.027⁽¹⁾	–	–	–
Cavallo et al.	2024	0.15	0.63	–	98	-0.060	–	–	–
Hunt & Reffert	2023	0.13	0.08	0.53	166	–	–	–	–

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

Visualization

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