HSC 1917

0.18 UTI

0.0

C_N

0.1

C_dens

0.75

C_C3

0.03

C_lit

1.0

C_dup

N_m (P>50%) 22

Core radius and density 2.3 [pc], 0.5 [pc^-2]

C3 classification AB

C_N 0.0 Sparse
C_dens 0.1 Very loose
C_C3 0.75 High quality
C_lit 0.03 Rarely studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

ℹ️

HSC 1917 is a sparse, very loose object of high C3 quality. Its parallax locates it at a large distance, near the mid-plane, affected by moderate extinction. It is catalogued as a metal-poor, 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.

Distant Moderate extinction Metal-poor Young

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD classes: 1.00 (50th percentile), true positive (human-assigned).

Hunt & Reffert (2023)
Classified as open cluster. CMD classes: 1.00 (50th percentile), true positive (human-assigned).

Data

🔍 Search references for HSC 1917 in: SciX Simbad

ℹ️

Reference	Year	RA [deg]	DEC [deg]	Plx [mas]	pmRA [mas/yr]	pmDE [mas/yr]	Rv [km/s]
UCC	99999–	116.335	-24.004	0.171	-1.257	1.974	–
Hunt & Reffert	2024	116.347	-24.004	0.176	-1.27	1.948	–
Cavallo et al.	2024	116.334	-24.021	0.176	–	–	–
Hunt & Reffert	2023	116.347	-24.004	0.176	-1.27	1.948	–

💡 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–	4.96	1.31	0.78	72	-0.560	283	–	–
Hunt & Reffert	2024	4.96	1.31	0.78	72	–	283⁽¹⁾	–	–
Cavallo et al.	2024	3.84	1.59	–	20	-0.560	–	–	–
Hunt & Reffert	2023	4.96	1.31	0.78	72	–	–	–	–

(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 3272	100.0	116.33	-24.0	0.19	-1.26	1.98	59.71	0.12

💡 Note: The % column shows the percentage of members that HSC 1917 shares with each listed object.

Visualization

ℹ️

1 2