HSC 1636

0.05 UTI

0.0

C_N

0.15

C_dens

0.12

C_C3

0.0

C_lit

0.92

C_dup

N₅₀ (P>50% members) 23

Stellar density (N₅₀/rad) 0.8 [N/pc²]

C3 classification DC

C_N 0.0 Sparse
C_dens 0.15 Very loose
C_C3 0.12 Very low quality
C_lit 0.0 Rarely studied
C_dup 0.92 Very likely unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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HSC 1636 is a sparse, very loose object of very low C3 quality. Its parallax locates it at a relatively close distance, near 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 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=0.92) indicate that this is quite probably an asterism, moving group, or artifact, and not a real open cluster.

Relatively close Low extinction Near-solar metallicity Young

Palma et al. (2025)
Part of multiple system G40, along with HSC_1641, CWNU_158, Collinder_104 and CWNU_1281.

Cavallo et al. (2024)
Silver sample.

Data

🔍 Search references for HSC 1636 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–	99.852	4.94	0.642	-2.042	0.75	28.991
Hunt & Reffert	2024	99.889	4.887	0.632	-2.046	0.766	28.925
Cavallo et al.	2024	99.822	4.929	0.631	–	–	–
Hunt & Reffert	2023	99.889	4.887	0.632	-2.046	0.766	28.925

💡 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–	1.47	0.59	0.89	62	0.250	88	–	–
Hunt & Reffert	2024	–	–	–	–	–	88⁽¹⁾	–	–
Cavallo et al.	2024	1.45	0.00	–	31	0.250	–	–	–
Hunt & Reffert	2023	1.49	1.18	0.89	92	–	–	–	–

(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 1281	8.0	100.68	4.73	0.64	-1.96	0.79	–	0.33

💡 Note: The % column shows the percentage of members that HSC 1636 shares with each listed object.

Visualization

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