HSC 1697

0.18 UTI

0.3

C_N

0.11

C_dens

0.38

C_C3

0.06

C_lit

1.0

C_dup

N_m (P>50%) 30

Core radius and density 2.0 [pc], 0.5 [pc^-2]

C3 classification CB

C_N 0.3 Poorly populated
C_dens 0.11 Very loose
C_C3 0.38 Low 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

ℹ️

HSC 1697 is a poorly populated, very loose object of low C3 quality. Its parallax locates it at a moderate distance, near the mid-plane, affected by moderate extinction. It is catalogued as a near-solar metallicity, intermediate-age cluster, but with a large variance across recent sources for the metallicity parameter (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.

Distant Moderate extinction Near-solar metallicity Intermediate age

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.76 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.76 (50th percentile).

Data

🔍 Search references for HSC 1697 in: SciX Simbad

ℹ️

Reference	Year	RA [deg]	DEC [deg]	Plx [mas]	pmRA [mas/yr]	pmDE [mas/yr]	Rv [km/s]
UCC	99999–	103.988	-2.291	0.299	-0.696	-0.713	–
Hu & Soubiran	2025	103.981	-2.29	–	–	–	–
Hunt & Reffert	2024	103.995	-2.272	0.286	-0.691	-0.727	–
Cavallo et al.	2024	103.981	-2.29	0.29	–	–	–
Hunt & Reffert	2023	103.995	-2.272	0.286	-0.691	-0.727	–

💡 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–	3.09	1.98	1.965	210	0.075	281	–	–
Hu & Soubiran	2025	–	–	–	–	-0.200⁽⁵⁾	–	–	–
Hunt & Reffert	2024	3.09	1.98	1.96	210	–	281⁽¹⁾	–	–
Cavallo et al.	2024	2.99	1.98	–	603	0.350	–	–	–
Hunt & Reffert	2023	3.09	1.98	1.97	210	–	–	–	–

(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 3270	86.7	103.99	-2.29	0.29	-0.7	-0.71	–	0.01

💡 Note: The % column shows the percentage of members that HSC 1697 shares with each listed object.

Visualization

ℹ️

1 2