ASCC 99

(MWSC 2999; FoF 2281; OCSN 132)

0.90 UTI

0.76

C_N

1.0

C_dens

0.75

C_C3

1.0

C_lit

1.0

C_dup

N₅₀ (P>50% members) 132

Stellar density (N₅₀/rad) 9.7 [N/pc²]

C3 classification AB

C_N 0.76 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 99 is a rich, very 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 near-solar metallicity, intermediate-age cluster, but with a large variance across recent sources for the age and metallicity parameters (see Parameters). It is very well-studied in the literature.

Very close Low extinction Near-solar metallicity Intermediate age

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

Cavallo et al. (2024)
Gold sample.

Data

🔍 Search references for ASCC 99 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–	282.167	-18.403	3.354	5.22	-1.427	-30.54
Li et al.	2025	282.17	-18.488	3.367	5.188	-1.311	–
Wei et al.	2025	282.16	-18.755	3.384	5.292	-1.687	–
Almeida et al.	2025	282.226	-18.412	–	–	–	–
Alfonso et al.	2024	282.269	-18.439	3.326	5.23	-1.421	–
Hunt & Reffert	2024	282.172	-18.384	3.281	5.247	-1.307	-29.856
Cavallo et al.	2024	282.174	-18.274	3.314	–	–	–
Hunt & Reffert	2023	282.172	-18.384	3.281	5.247	-1.307	-29.856
Qin et al.	2023	282.15	-18.71	3.37	5.22	-1.43	-29.39
Just et al.	2023	282.269	-18.742	–	–	–	–
Tarricq et al.	2022	282.152	-18.597	3.36	5.189	-1.38	–
Dias et al.	2021	282.226	-18.412	3.384	5.212	-1.33	-23.2
Cantat-Gaudin et al.	2020	282.17	-18.488	3.367	5.188	-1.311	–
Cantat-Gaudin & Anders	2020	282.17	-18.488	3.367	5.188	-1.311	–
Liu & Pang	2019	282.024	-18.28	1.054	-1.099	-4.082	–
Soubiran et al.	2018	282.17	-18.488	–	–	–	-29.8
Bica et al.	2019	282.337	-18.765	–	–	–	–
Cantat-Gaudin et al.	2018	282.17	-18.488	3.367	5.188	-1.311	–
Kharchenko et al.	2016	282.269	-18.742	–	–	–	–
Dias et al.	2014	282.271	-18.73	–	1.01	-5.24	–
Kharchenko et al.	2013	282.277	-18.74	–	5.99	-5.1	-31.3
Gozha et al.	2012	282.271	-18.73	–	–	–	–
Piskunov et al.	2008	282.261	-18.729	–	–	–	–
Kharchenko et al.	2007	282.27	-18.73	–	0.23	–	-31.29
Kharchenko et al.	2005	282.27	-18.73	–	6.9	-2.5	-31.29
Dias et al.	2002	282.271	-18.73	–	6.9	-2.5	-31.3

💡 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–	0.29	0.58	1.24	359	0.105	76	0.17	–
Li et al.	2025	0.31	0.70	–	301	0.264	–	–	–
Wei et al.	2025	0.51	1.50	–	35	-0.500	161	0.17	–
Almeida et al.	2025	0.29	0.76	–	308	–	76	–	–
Alfonso et al.	2024	0.29	0.47	–	600	-0.040	–	–	–
Hunt & Reffert	2024	–	–	–	–	–	156⁽¹⁾	–	–
Cavallo et al.	2024	0.31	1.03	–	74	0.270	–	–	–
Hunt & Reffert	2023	0.29	0.69	1.24	89	–	–	–	–
Qin et al.	2023	0.41	0.87	–	100	–	–	–	–
Just et al.	2023	–	–	–	562	–	33	–	–
Tarricq et al.	2022	0.28	–	–	363	–	–	–	–
Dias et al.	2021	0.29	0.76	–	308	-0.040	–	–	–
Cantat-Gaudin et al.	2020	0.29	0.47	–	355	–	–	–	–
Cantat-Gaudin & Anders	2020	0.29	–	–	–	–	–	–	–
Liu & Pang	2019	–	–	–	93	0.250	–	–	–
Soubiran et al.	2018	0.29	–	–	–	–	–	–	–
Cantat-Gaudin et al.	2018	0.29	–	–	–	–	–	–	–
Kharchenko et al.	2016	0.68	0.39	–	562	–	–	–	–
Kharchenko et al.	2013	0.68	0.39	–	562	–	–	–	–
Gozha et al.	2012	0.28	–	–	513	–	10	–	–
Piskunov et al.	2008	0.28	0.46	–	513	–	–	–	–
Kharchenko et al.	2005	0.28	0.46	–	513	–	–	–	–
Dias et al.	2002	0.28	0.46	–	513	–	–	–	–

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

Visualization

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