HSC 2871

0.15 UTI

0.0

C_N

0.11

C_dens

0.62

C_C3

0.0

C_lit

1.0

C_dup

N₅₀ (P>50% members) 17

Stellar density (N₅₀/rad) 0.5 [N/pc²]

C3 classification AC

C_N 0.0 Sparse
C_dens 0.11 Very loose
C_C3 0.62 Intermediate 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

ℹ️

HSC 2871 is a sparse, very loose object of intermediate 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 metallicity 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)
Classified as optical pair P492, along with NGC_6475.

Cavallo et al. (2024)
Gold sample.

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

Data

🔍 Search references for HSC 2871 in: SciX Simbad

ℹ️

Reference	Year	RA [deg]	DEC [deg]	Plx [mas]	pmRA [mas/yr]	pmDE [mas/yr]	Rv [km/s]
UCC	99999–	265.009	-42.442	3.472	-7.383	-15.901	-12.857
Hu & Soubiran	2025	266.12	-41.19	–	–	–	–
Cavallo et al.	2024	266.12	-41.19	3.459	–	–	–
Hunt & Reffert	2023	264.876	-42.874	3.459	-7.372	-15.611	-12.351

💡 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–	0.28	0.48	0.53	487	-0.095	–	–	–
Hu & Soubiran	2025	–	–	–	–	-0.400⁽⁵⁾	–	–	–
Cavallo et al.	2024	0.28	0.68	–	617	0.210	–	–	–
Hunt & Reffert	2023	0.28	0.28	0.53	357	–	–	–	–

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

Visualization

ℹ️

1 2