HSC 2801

0.29 UTI

0.61

C_N

0.55

C_dens

1.0

C_C3

0.03

C_lit

0.65

C_dup

N_m (P>50%) 72

Core radius and density 1.9 [pc], 2.8 [pc^-2]

C3 classification AA

C_N 0.61 Moderately populated
C_dens 0.55 Moderately dense
C_C3 1.0 Very high quality
C_lit 0.03 Rarely studied
C_dup 0.65 Likely unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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HSC 2801 is a moderately populated, moderately dense object of very high C3 quality. Its parallax locates it at a large distance, above the mid-plane, affected by high extinction. It is catalogued as a massive, near-solar metallicity, intermediate-age cluster (see Parameters). It was recently reported in the literature.

Note: This is likely a unique object, which shares a moderate percentage of members with at least one previously reported entry. See table with shared members information.

Distant High extinction Massive Near-solar metallicity Intermediate age

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD classes: 0.06 (50th percentile), false positive (human-assigned).

Hunt & Reffert (2023)
Classified as open cluster. CMD classes: 0.06 (50th percentile), false positive (human-assigned).

Data

🔍 Search references for HSC 2801 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–	248.428	-45.808	0.199	-2.791	-3.496	-30.105
Hunt & Reffert	2024	248.419	-45.813	0.2	-2.791	-3.492	-30.976
Cavallo et al.	2024	248.431	-45.811	0.199	–	–	–
Hunt & Reffert	2023	248.419	-45.813	0.2	-2.791	-3.492	-30.976

💡 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–	4.31	4.8	2.49	160	0.440	2960	–	–
Hunt & Reffert	2024	4.31	4.81	2.49	159	–	2960⁽¹⁾	–	–
Cavallo et al.	2024	3.98	4.62	–	302	0.440	–	–	–
Hunt & Reffert	2023	4.31	4.80	2.49	160	–	–	–	–

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

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
OC 0664	34.7	248.42	-45.81	0.17	-2.8	-3.47	-31.02	0.23

💡 Note: The % column shows the percentage of members that HSC 2801 shares with each listed object.

Visualization

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