HSC 1857

0.23 UTI

0.0

C_N

0.46

C_dens

0.62

C_C3

0.03

C_lit

1.0

C_dup

N_m (P>50%) 24

Core radius and density 1.2 [pc], 2.3 [pc^-2]

C3 classification CA

C_N 0.0 Sparse
C_dens 0.46 Loose
C_C3 0.62 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 1857 is a sparse, loose object of intermediate C3 quality. Its parallax locates it at a moderate distance, near the mid-plane, affected by moderate extinction. It is catalogued as a near-solar metallicity, young 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 Moderate extinction Near-solar metallicity Young

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 1.00 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 1.00 (50th percentile).

Data

🔍 Search references for HSC 1857 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–	112.784	-19.399	0.379	-2.113	2.512	–
Hunt & Reffert	2024	112.775	-19.402	0.378	-2.112	2.491	–
Cavallo et al.	2024	112.783	-19.394	0.374	–	–	–
Hunt & Reffert	2023	112.775	-19.402	0.378	-2.112	2.491	–

💡 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–	2.37	1.23	0.57	61	0.010	169	–	–
Hunt & Reffert	2024	2.37	1.23	0.57	61	–	169⁽¹⁾	–	–
Cavallo et al.	2024	2.45	1.04	–	372	0.010	–	–	–
Hunt & Reffert	2023	2.37	1.23	0.57	61	–	–	–	–

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

Visualization

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