HSC 639

0.07 UTI

0.0

C_N

0.03

C_dens

0.25

C_C3

0.03

C_lit

1.0

C_dup

N_m (P>50%) 14

Core radius and density 2.7 [pc], 0.1 [pc^-2]

C3 classification CC

C_N 0.0 Sparse
C_dens 0.03 Very loose
C_C3 0.25 Low 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 639 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 an extremely massive, near-solar metallicity, intermediate-age cluster (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.

Distant High extinction Extremely massive Near-solar metallicity Intermediate age

Cavallo et al. (2024)
Wood 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 639 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–	312.41	40.444	0.204	-2.961	-4.208	-44.528
Hunt & Reffert	2024	312.409	40.461	0.216	-2.911	-4.235	-46.033
Cavallo et al.	2024	312.393	40.441	0.218	–	–	–
Hunt & Reffert	2023	312.409	40.461	0.216	-2.911	-4.235	-46.033

💡 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–	3.91	4.0	3.05	328	0.090	10117	–	–
Hunt & Reffert	2024	3.91	4.00	3.05	328	–	10117⁽¹⁾	–	–
Cavallo et al.	2024	4.55	3.65	–	204	0.090	–	–	–
Hunt & Reffert	2023	3.91	4.00	3.05	328	–	–	–	–

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

Visualization

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