ASCC 24

(Alessi 47; MWSC 875)

0.39 UTI

0.0

C_N

0.55

C_dens

0.75

C_C3

0.32

C_lit

1.0

C_dup

N_m (P>50%) 24

Core radius and density 0.8 [pc], 2.7 [pc^-2]

C3 classification AB

C_N 0.0 Sparse
C_dens 0.55 Moderately dense
C_C3 0.75 High quality
C_lit 0.32 Poorly studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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ASCC 24 is a sparse, moderately dense object of high C3 quality. Its parallax locates it at a very close^* distance, near the mid-plane, affected by low extinction. It is catalogued as a low-mass, near-solar metallicity, very young cluster, but with a large variance across recent sources for the absorption and age parameters (see Parameters). It is poorly studied in the literature.

(*): The parallax distance estimate (~0.21 kpc) differs significantly from the median photometric distance (~0.40 kpc).

Very close Low extinction Low mass Near-solar metallicity Very young

Palma et al. (2025)
Classified as optical pair P266, along with HSC_1709.

Cavallo et al. (2024)
Wood sample.

Hunt & Reffert (2024)
Classified as moving group. CMD class: 0.98 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.98 (50th percentile).

Bica et al. (2019)
List of clusters and alike reported by B. Alessi.

Data

🔍 Search references for ASCC 24 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–	97.351	-7.035	4.774	-7.378	-2.857	18.737
Cavallo et al.	2024	98.287	-6.882	4.727	–	–	–
Hunt & Reffert	2023	97.261	-7.035	4.728	-7.354	-2.881	35.998
Bica et al.	2019	97.18	-7.021	–	–	–	–
Dias et al.	2018	–	–	–	-0.75	-0.41	–
Sampedro et al.	2017	97.183	-7.02	–	0.77	-3.56	–
Joshi et al.	2016	97.185	-6.98	–	–	–	–
Dias et al.	2014	97.183	-7.02	–	0.4	-3.46	–
Gozha et al.	2012	97.183	-7.02	–	–	–	–
Piskunov et al.	2008	97.18	-7.021	–	–	–	–
Kharchenko et al.	2007	97.18	-7.02	–	0.35	–	16.35
Kharchenko et al.	2005	97.18	-7.02	–	-5.55	-4.05	16.35
Dias et al.	2002	97.183	-7.02	–	-5.55	-4.05	15.66

💡 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–	0.4	0.44	0.48	9	-0.490	40	–	–
Cavallo et al.	2024	0.19	0.00	–	1	-0.490	–	–	–
Hunt & Reffert	2023	0.22	0.39	0.48	32	–	–	–	–
Joshi et al.	2016	0.38	0.46	–	20	–	40	–	–
Gozha et al.	2012	0.40	–	–	9	–	40	–	–
Piskunov et al.	2008	0.40	0.44	–	9	–	–	–	–
Kharchenko et al.	2005	0.40	0.44	–	9	–	–	–	–
Dias et al.	2002	0.40	0.44	–	9	–	–	–	–

Visualization

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