HSC 1685

0.06 UTI

0.0

C_N

0.02

C_dens

0.25

C_C3

0.03

C_lit

0.96

C_dup

N_m (P>50%) 19

Core radius and density 4.0 [pc], 0.1 [pc^-2]

C3 classification CC

C_N 0.0 Sparse
C_dens 0.02 Very loose
C_C3 0.25 Low quality
C_lit 0.03 Rarely studied
C_dup 0.96 Unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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HSC 1685 is a sparse, very loose object of low C3 quality. Its parallax locates it at a large distance, near the mid-plane, affected by moderate extinction. It is catalogued as a near-solar metallicity, young cluster (see Parameters). It was recently reported in the literature.

Note: This is a unique object, which shares a very 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=0.96) indicate that this is quite probably an asterism, moving group, or artifact, and not a real open cluster.

Distant Moderate extinction Near-solar metallicity Young

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.83 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.83 (50th percentile).

Data

🔍 Search references for HSC 1685 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–	103.308	-0.638	0.183	-0.195	0.603	59.723
Hunt & Reffert	2024	103.306	-0.657	0.199	-0.238	0.624	–
Cavallo et al.	2024	103.355	-0.588	0.198	–	–	–
Hunt & Reffert	2023	103.306	-0.657	0.199	-0.238	0.624	–

💡 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–	4.37	1.85	1.57	48	0.120	158	–	–
Hunt & Reffert	2024	4.37	1.85	1.57	48	–	158⁽¹⁾	–	–
Cavallo et al.	2024	3.77	1.79	–	76	0.120	–	–	–
Hunt & Reffert	2023	4.37	1.85	1.57	48	–	–	–	–

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

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
CWWDL 2058	4.0	103.43	-0.49	0.2	-0.38	0.49	78.49	0.03

💡 Note: The % column shows the percentage of members that HSC 1685 shares with each listed object.

Visualization

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