Ivanov 4

(MWSC 1061)

0.62 UTI

0.3

C_N

1.0

C_dens

0.62

C_C3

0.6

C_lit

1.0

C_dup

C3 classification AC

Number of members (P>50%) 30

Radius (P>50% members) 2.0 [arcmin]

C_N 0.3 Poorly populated
C_dens 1.0 Very dense
C_C3 0.62 Intermediate quality
C_lit 0.6 Moderately studied
C_dup 1.0 Unique

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

Overview

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Ivanov 4 is a poorly populated, very dense object of intermediate C3 quality. Its parallax locates it at a moderate distance, below the mid-plane, affected by moderate extinction. It is catalogued as a near-solar metallicity, intermediate-age cluster, but with a large variance across recent sources for the age parameter (see Parameters). It is moderately studied in the literature.

Relatively close Moderate extinction Near-solar metallicity Intermediate age

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

Data

🔍 Search references for Ivanov 4 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	–	105.145	-8.859	0.362	-1.311	1.022	-1.081
Almeida et al.	2025	105.15	-8.867	–	–	–	–
Just et al.	2023	105.151	-8.838	–	–	–	–
Dias et al.	2021	105.15	-8.867	0.365	-1.38	0.977	–
Cantat-Gaudin et al.	2020	105.144	-8.861	0.355	-1.355	1.022	–
Cantat-Gaudin & Anders	2020	105.144	-8.861	0.355	-1.355	1.022	–
Cantat-Gaudin et al.	2018	105.144	-8.861	0.355	-1.355	1.022	–
Loktin & Popova	2017	105.135	-8.866	–	1.225	-0.459	–
Kharchenko et al.	2016	105.151	-8.838	–	–	–	–
Kharchenko et al.	2013	105.157	-8.84	–	5.19	-1.15	–
Dias et al.	2002	105.133	-8.867	–	6.11	-17.42	–

💡 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
Almeida et al.	2025	2.51	1.37	–	12	–	101	–	–
Just et al.	2023	–	–	–	200	–	229	–	–
Dias et al.	2021	2.51	1.37	–	12	-0.195	–	–	–
Cantat-Gaudin et al.	2020	2.48	1.24	–	63	–	–	–	–
Cantat-Gaudin & Anders	2020	2.60	–	–	–	–	–	–	–
Cantat-Gaudin et al.	2018	2.60	–	–	–	–	–	–	–
Loktin & Popova	2017	2.34	0.29	–	891	–	–	–	–
Kharchenko et al.	2016	2.02	1.62	–	200	–	–	–	–
Kharchenko et al.	2013	2.02	1.62	–	200	–	–	–	–
Dias et al.	2002	0.72	0.65	–	10	–	–	–	–

Visualization

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