HSC 258

0.02 UTI

0.44

C_N

0.76

C_dens

0.75

C_C3

0.0

C_lit

0.04

C_dup

N₅₀ (P>50% members) 44

Stellar density (N₅₀/rad) 3.8 [N/pc²]

C3 classification BA

C_N 0.44 Poorly populated
C_dens 0.76 Dense
C_C3 0.75 High quality
C_lit 0.0 Rarely studied
C_dup 0.04 Very likely duplicate

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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HSC 258 is a poorly populated, dense object of high C3 quality. Its parallax locates it at a moderate distance, above the mid-plane, affected by high extinction. It is catalogued as a near-solar metallicity, young cluster (see Parameters). It was recently reported in the literature.

⚠️ Warning: This is very likely a duplicate object, which shares a large percentage of members with at least one previously reported entry. See table with shared members information.

Relatively close High extinction Near-solar metallicity Young

Cavallo et al. (2024)
Bronze sample.

Data

🔍 Search references for HSC 258 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–	278.423	-4.931	0.402	-0.558	-2.383	–
Hunt & Reffert	2024	278.423	-4.874	0.411	-0.565	-2.371	–
Cavallo et al.	2024	278.422	-4.954	0.404	–	–	–
Hunt & Reffert	2023	278.423	-4.874	0.411	-0.565	-2.371	–

💡 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–	2.69	3.265	2.26	28	0.360	634	–	–
Hunt & Reffert	2024	–	–	–	–	–	634⁽¹⁾	–	–
Cavallo et al.	2024	3.05	3.27	–	32	0.360	–	–	–
Hunt & Reffert	2023	2.33	3.26	2.26	23	–	–	–	–

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

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
IRAS 18306-0500	95.5	278.4	-4.97	0.4	-0.56	-2.38	-3.16	0.45

💡 Note: The % column shows the percentage of members that HSC 258 shares with each listed object.

Visualization

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