Platais 3

(MWSC 395; HIP 21974 Group; OCSN 250)

0.95 UTI

0.75

C_N

1.0

C_dens

1.0

C_C3

1.0

C_lit

1.0

C_dup

C3 classification AA

Number of members (P>50%) 102

Radius (P>50% members) 59.6 [arcmin]

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

📥 Members 📊 Colab 🔬 Bayestar19 🔍 CDS 🔍 Simbad 🔍 CDS (α, δ) 🔍 Simbad (α, δ)

Overview

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Platais 3 is a rich, very dense object of very high C3 quality. Its parallax locates it at a very close distance, above 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 absorption, 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: good fit. Isochrone match: good fit.

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as a moving group.

Data

🔍 Search references for Platais 3 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	–	69.706	71.179	5.591	3.671	-20.646	7.643
Li et al.	2025	69.976	71.28	5.62	3.616	-20.931	–
Almeida et al.	2025	69.801	71.261	–	–	–	–
Alfonso et al.	2024	70.13	71.019	5.581	3.492	-20.708	–
Cavallo et al.	2024	69.332	71.202	5.625	–	–	–
Hunt & Reffert	2023	68.406	71.489	5.622	3.767	-20.681	7.694
Qin et al.	2023	69.77	71.29	5.68	3.16	-20.97	7.46
He et al.	2022	69.086	71.264	5.598	3.787	-20.702	–
Tarricq et al.	2022	68.107	71.226	5.591	4.013	-20.646	–
Dias et al.	2021	69.801	71.261	5.604	3.649	-20.905	7.949
Cantat-Gaudin et al.	2020	69.976	71.28	5.62	3.616	-20.931	–
Cantat-Gaudin & Anders	2020	69.976	71.28	5.62	3.616	-20.931	–
Bossini et al.	2019	69.976	71.28	–	–	–	–
Soubiran et al.	2018	69.976	71.28	–	–	–	8.07
Bica et al.	2019	70.374	71.236	–	–	–	–
Cantat-Gaudin et al.	2018	69.976	71.28	5.62	3.616	-20.931	–
Yen et al.	2018	69.906	71.268	5.22	3.83	-20.37	–
Loktin & Popova	2017	70.41	71.238	–	3.84	-21.35	7.0
Dias et al.	2014	70.404	71.237	–	0.89	0.01	–
Gozha et al.	2012	70.404	71.237	–	–	–	–
Piskunov et al.	2008	68.841	71.581	–	–	–	–
Kharchenko et al.	2007	70.41	71.24	–	2.5	–	7.0
Piskunov et al.	2007	68.841	71.581	–	–	–	–
van den Bergh	2006	70.404	71.237	–	–	–	–
Kharchenko et al.	2005	68.85	71.58	–	3.3	-20.5	7.0
Dias et al.	2002	70.404	71.237	–	3.84	-21.35	7.0

💡 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]	Bfr	BSS
Li et al.	2025	0.17	0.23	–	84	-0.345	–	–	–
Almeida et al.	2025	0.18	0.08	–	182	–	42	–	–
Alfonso et al.	2024	0.18	0.00	–	86	-0.007	–	–	–
Cavallo et al.	2024	0.18	0.36	–	437	0.270	–	–	–
Hunt & Reffert	2023	0.18	0.10	0.40	175	–	–	–	–
Qin et al.	2023	0.19	0.22	–	112	–	–	–	–
He et al.	2022	–	0.30	–	158	–	–	–	–
Tarricq et al.	2022	0.18	–	–	178	–	–	–	–
Dias et al.	2021	0.18	0.08	–	182	-0.007	–	–	–
Cantat-Gaudin et al.	2020	0.18	0.00	–	178	–	–	–	–
Cantat-Gaudin & Anders	2020	0.18	–	–	–	–	–	–	–
Bossini et al.	2019	0.17	0.22	–	208	0.000	–	–	–
Soubiran et al.	2018	0.18	–	–	–	–	–	–	–
Cantat-Gaudin et al.	2018	0.18	–	–	–	–	–	–	–
Yen et al.	2018	0.18	0.00	–	832	–	–	–	–
Loktin & Popova	2017	0.24	0.31	–	501	–	–	–	–
Gozha et al.	2012	0.16	–	–	501	–	1259	–	–
Piskunov et al.	2008	0.20	0.31	–	501	–	286*	–	–
Piskunov et al.	2007	0.20	0.31	–	501	–	196	–	–
van den Bergh	2006	0.16	–	–	398	–	–	–	–
Kharchenko et al.	2005	0.20	0.31	–	501	–	–	–	–
Dias et al.	2002	0.20	0.31	–	501	–	–	–	–

(*): Indicates that this parameter is assigned more than one value in the corresponding reference.

Visualization

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