HSC 1887

0.33 UTI

0.4

C_N

0.13

C_dens

1.0

C_C3

0.06

C_lit

1.0

C_dup

N_m (P>50%) 40

Core radius and density 2.2 [pc], 0.7 [pc^-2]

C3 classification AA

C_N 0.4 Poorly populated
C_dens 0.13 Very loose
C_C3 1.0 Very high quality
C_lit 0.06 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 1887 is a poorly populated, very loose object of very high C3 quality. Its parallax locates it at a very large^* distance, well below the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, old cluster (see Parameters). It was recently reported in the literature.

(*): The parallax distance estimate (~10.89 kpc) differs significantly from the median photometric distance (~6.85 kpc).

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

Very distant Low extinction Near-solar metallicity Old

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.79 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.79 (50th percentile).

Data

🔍 Search references for HSC 1887 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–	108.595	-24.307	0.092	-0.932	1.44	–
Hu & Soubiran	2025	108.594	-24.305	–	–	–	–
Hunt & Reffert	2024	108.597	-24.308	0.1	-0.937	1.444	–
Cavallo et al.	2024	108.594	-24.305	0.1	–	–	–
Hunt & Reffert	2023	108.597	-24.308	0.1	-0.937	1.444	–

💡 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–	6.85	0.72	1.69	1047	-0.480	439	–	–
Hu & Soubiran	2025	–	–	–	–	-0.450⁽⁵⁾	–	–	–
Hunt & Reffert	2024	6.84	0.72	1.69	1047	–	439⁽¹⁾	–	–
Cavallo et al.	2024	7.31	1.13	–	891	-0.510	–	–	–
Hunt & Reffert	2023	6.85	0.72	1.69	1047	–	–	–	–

(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 2954	97.5	108.6	-24.31	0.09	-0.93	1.44	–	0.05

💡 Note: The % column shows the percentage of members that HSC 1887 shares with each listed object.

Visualization

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