HSC 1894

0.22 UTI

0.39

C_N

0.3

C_dens

0.75

C_C3

0.0

C_lit

0.77

C_dup

N₅₀ (P>50% members) 39

Stellar density (N₅₀/rad) 1.5 [N/pc²]

C3 classification AB

C_N 0.39 Poorly populated
C_dens 0.3 Loose
C_C3 0.75 High quality
C_lit 0.0 Rarely studied
C_dup 0.77 Very likely unique

📥 Members 📊 Colab 🔬 Bayestar19

MOCA 🔍 CDS 🔍 Simbad 🔍 CDS (α, δ) 🔍 Simbad (α, δ)

Overview

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HSC 1894 is a poorly populated, loose object of high C3 quality. Its parallax locates it at a close distance, below the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, young cluster, but with a large variance across recent sources for the absorption parameter (see Parameters). It was recently reported in the literature.

Note: This is very likely a unique object, which shares a small percentage of members with at least one previously reported entry. See table with shared members information.

⚠️ Warning: the low UTI value and no obvious signs of duplication (C_dup=0.77) indicate that this is quite probably an asterism, moving group, or artifact, and not a real open cluster.

Close Low extinction Near-solar metallicity Young

Liu et al. (2025)
Classified as primordial binary cluster 20 along with Alessi_33, and of multiple system 10 along with HSC_1913 and Alessi_33.

Palma et al. (2025)
Part of multiple system G2, along with Alessi_33 and HSC_1913.

Cavallo et al. (2024)
Gold sample.

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

Data

🔍 Search references for HSC 1894 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–	103.335	-26.907	1.217	-2.853	3.605	37.762
Liu et al.	2025	103.27	-26.97	1.22	-2.91	3.6	33.93
Cavallo et al.	2024	103.652	-27.031	1.224	–	–	–
Hunt & Reffert	2023	103.267	-26.975	1.219	-2.91	3.604	33.928

💡 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–	0.84	0.1	0.67	21	-0.120	–	–	–
Liu et al.	2025	0.84	0.06	–	30	–	–	–	–
Cavallo et al.	2024	0.88	0.63	–	12	-0.120	–	–	–
Hunt & Reffert	2023	0.79	0.10	0.67	21	–	–	–	–

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
FSR 1279	23.1	103.66	-26.8	1.21	-2.98	3.6	39.36	0.43

💡 Note: The % column shows the percentage of members that HSC 1894 shares with each listed object.

Visualization

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