ASCC 9

(MWSC 228)

0.91 UTI

0.81

C_N

1.0

C_dens

0.75

C_C3

1.0

C_lit

1.0

C_dup

N₅₀ (P>50% members) 251

Stellar density (N₅₀/rad) 6.4 [N/pc²]

C3 classification AB

C_N 0.81 Rich
C_dens 1.0 Very dense
C_C3 0.75 High quality
C_lit 1.0 Very well-studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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ASCC 9 is a rich, very dense object of high C3 quality. Its parallax locates it at a moderate distance, near the mid-plane, affected by moderate extinction. It is catalogued as a massive, near-solar metallicity, very young cluster, but with a large variance across recent sources for the metallicity and mass parameters (see Parameters). It is very well-studied in the literature.

Relatively close Moderate extinction Massive Near-solar metallicity Very young

Almeida et al. (2025)
Mass determination: intermediate fit. Isochrone match: intermediate fit.

Cavallo et al. (2024)
Gold sample.

Data

🔍 Search references for ASCC 9 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–	41.704	57.735	0.401	0.162	-1.125	-48.277
Almeida et al.	2025	41.679	57.763	–	–	–	–
Hunt & Reffert	2024	41.624	57.777	0.402	0.169	-1.139	-23.791
Celli et al.	2024	41.671	57.743	–	–	–	–
Cavallo et al.	2024	41.691	57.735	0.402	–	–	–
Hunt & Reffert	2023	41.624	57.777	0.402	0.169	-1.139	-23.791
Almeida et al.	2023	41.696	57.783	–	–	–	–
Just et al.	2023	41.733	57.743	–	–	–	–
Dias et al.	2021	41.679	57.763	0.409	0.16	-1.105	–
Cantat-Gaudin et al.	2020	41.671	57.743	0.406	0.166	-1.099	–
Cantat-Gaudin & Anders	2020	41.671	57.743	0.406	0.166	-1.099	–
Dias et al.	2019	41.729	57.73	0.391	0.156	-1.086	-72.118
Cantat-Gaudin et al.	2018	41.671	57.743	0.406	0.166	-1.099	–
Kharchenko et al.	2016	41.733	57.743	–	–	–	–
Dias et al.	2014	41.729	57.73	–	-0.93	-0.33	–
Kharchenko et al.	2013	41.745	57.745	–	-0.32	-2.5	-41.8
Gozha et al.	2012	41.729	57.73	–	–	–	–
Kharchenko et al.	2012	41.745	57.745	–	-0.41	-2.54	-41.75
Piskunov et al.	2008	41.71	57.726	–	–	–	–
Kharchenko et al.	2007	41.73	57.73	–	0.17	–	-41.75
Kharchenko et al.	2005	41.73	57.73	–	0.76	-3.03	-41.75
Dias et al.	2002	41.729	57.73	–	-0.93	-0.33	-40.73

💡 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–	2.61	2.58	1.08	10	-0.133	1010	0.58	–
Almeida et al.	2025	2.32	2.57	–	9	–	645	–	–
Hunt & Reffert	2024	–	–	–	–	–	1143⁽¹⁾	–	–
Celli et al.	2024	–	–	–	30	–	595	–	–
Cavallo et al.	2024	2.84	2.54	–	23	0.630	–	–	–
Hunt & Reffert	2023	2.34	2.50	1.08	29	–	–	–	–
Almeida et al.	2023	2.12	2.58	–	18	-0.106	2154⁽¹⁾	0.58	–
Just et al.	2023	–	–	–	10	–	877	–	–
Dias et al.	2021	2.32	2.57	–	9	-0.159	–	–	–
Cantat-Gaudin et al.	2020	2.38	2.23	–	30	–	–	–	–
Cantat-Gaudin & Anders	2020	2.30	–	–	–	–	–	–	–
Dias et al.	2019	2.05	2.51	–	19	-2.028	–	–	–
Cantat-Gaudin et al.	2018	2.30	–	–	–	–	–	–	–
Kharchenko et al.	2016	2.90	2.79	–	10	–	–	–	–
Kharchenko et al.	2013	2.90	2.79	–	10	–	–	–	–
Gozha et al.	2012	2.90	–	–	6	–	2951	–	–
Kharchenko et al.	2012	2.90	2.79	–	10	–	–	–	–
Piskunov et al.	2008	2.90	2.79	–	6	–	–	–	–
Kharchenko et al.	2005	2.90	2.79	–	6	–	–	–	–
Dias et al.	2002	2.90	2.79	–	6	–	–	–	–

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

Visualization

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