HSC 1689

0.08 UTI

0.0

C_N

0.15

C_dens

0.25

C_C3

0.0

C_lit

1.0

C_dup

C3 classification DB

Number of members (P>50%) 23

Radius (P>50% members) 2.4 [arcmin]

C_N 0.0 Sparse
C_dens 0.15 Very loose
C_C3 0.25 Low quality
C_lit 0.0 Rarely studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19 🔍 CDS 🔍 Simbad 🔍 CDS (α, δ) 🔍 Simbad (α, δ)

Overview

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HSC 1689 is a sparse, very loose object of low C3 quality. Its parallax locates it at a large distance, below the mid-plane, affected by high extinction. It is catalogued as a massive, 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.

⚠️ Warning: the low UTI value and no obvious signs of duplication (C_dup=1.0) indicate that this is quite probably an asterism, moving group, or artifact, and not a real open cluster.

Very distant High extinction Massive Young

Data

🔍 Search references for HSC 1689 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	–	101.499	-1.96	0.127	-0.332	0.315	111.595
Hunt & Reffert	2024	101.503	-1.951	0.129	-0.325	0.329	–
Hunt & Reffert	2023	101.503	-1.951	0.129	-0.325	0.329	–

💡 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]	Bfr	BSS
Hunt & Reffert	2024	–	–	–	–	–	1324*	–	–
Hunt & Reffert	2023	6.29	3.30	2.06	36	–	–	–	–

(*): Indicates that this parameter is assigned more than one value in the corresponding reference.

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
CWNU 3261	88.0	101.5	-1.97	0.11	-0.33	0.31	111.59	0.01

💡 Note: The % column shows the percentage of members that HSC 1689 shares with each listed object.

Visualization

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