HSC 721

0.22 UTI

0.38

C_N

0.14

C_dens

0.5

C_C3

0.03

C_lit

1.0

C_dup

N_m (P>50%) 38

Core radius and density 2.6 [pc], 0.7 [pc^-2]

C3 classification BB

C_N 0.38 Poorly populated
C_dens 0.14 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

ℹ️

HSC 721 is a poorly populated, very loose object of intermediate C3 quality. Its parallax locates it at a moderate distance, above the mid-plane, affected by high extinction. It is catalogued as a metal-rich, intermediate-age cluster, but with a large variance across recent sources for the age 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.

Relatively close High extinction Metal-rich Intermediate age

Cavallo et al. (2024)
Bronze sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.23 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.23 (50th percentile).

Data

🔍 Search references for HSC 721 in: SciX Simbad

ℹ️

Reference	Year	RA [deg]	DEC [deg]	Plx [mas]	pmRA [mas/yr]	pmDE [mas/yr]	Rv [km/s]
UCC	99999–	317.905	49.919	0.393	-3.81	-4.651	–
Hunt & Reffert	2024	317.899	49.911	0.388	-3.826	-4.665	–
Cavallo et al.	2024	317.892	49.934	0.384	–	–	–
Hunt & Reffert	2023	317.899	49.911	0.388	-3.826	-4.665	–

💡 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–	2.35	4.88	2.67	218	0.690	499	–	–
Hunt & Reffert	2024	2.35	4.88	2.67	218	–	499⁽¹⁾	–	–
Cavallo et al.	2024	2.73	4.89	–	24	0.690	–	–	–
Hunt & Reffert	2023	2.35	4.88	2.67	218	–	–	–	–

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

Visualization

ℹ️

1 2