HSC 1870

0.25 UTI

0.28

C_N

0.15

C_dens

0.75

C_C3

0.03

C_lit

1.0

C_dup

N_m (P>50%) 28

Core radius and density 1.4 [pc], 0.8 [pc^-2]

C3 classification AB

C_N 0.28 Poorly populated
C_dens 0.15 Very loose
C_C3 0.75 High 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 1870 is a poorly populated, very loose object of high C3 quality. Its parallax locates it at a moderate distance, above the mid-plane, affected by low extinction. It is catalogued as a metal-rich, young cluster (see Parameters). It was recently reported in the literature.

Note: This object shares a large percentage of members with a later reported entry. See table with shared members information.

Relatively close Low extinction Metal-rich Young

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD classes: 0.99 (50th percentile), true positive (human-assigned).

Hunt & Reffert (2023)
Classified as open cluster. CMD classes: 0.99 (50th percentile), true positive (human-assigned).

Data

🔍 Search references for HSC 1870 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–	115.02	-19.088	0.306	-2.078	2.988	–
Hunt & Reffert	2024	115.019	-19.09	0.296	-2.086	2.976	78.879
Cavallo et al.	2024	115.048	-19.077	0.306	–	–	–
Hunt & Reffert	2023	115.019	-19.09	0.296	-2.086	2.976	78.879

💡 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–	2.86	1.0	1.46	82	0.560	253	–	–
Hunt & Reffert	2024	2.86	1.00	1.46	82	–	253⁽¹⁾	–	–
Cavallo et al.	2024	3.27	1.03	–	123	0.560	–	–	–
Hunt & Reffert	2023	2.86	1.00	1.46	82	–	–	–	–

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

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
CWNU 3407	100.0	115.03	-19.08	0.3	-2.09	2.98	–	0.11

💡 Note: The % column shows the percentage of members that HSC 1870 shares with each listed object.

Visualization

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