Johansson 1

(MWSC 2318)

0.23 UTI

0.0

C_N

0.29

C_dens

0.12

C_C3

0.38

C_lit

1.0

C_dup

C3 classification DC

Number of members (P>50%) 15

Radius (P>50% members) 6.3 [arcmin]

C_N 0.0 Sparse
C_dens 0.29 Loose
C_C3 0.12 Very low quality
C_lit 0.38 Poorly studied
C_dup 1.0 Unique

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

Overview

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Johansson 1 is a sparse, loose object of very low C3 quality. Its parallax locates it at a relatively close^* distance, above the mid-plane, affected by low extinction. It is catalogued as an intermediate-age cluster (see Parameters). It is poorly studied in the literature.

(*): The parallax distance estimate (~1.76 kpc) differs significantly from the median photometric distance (~0.87 kpc).

⚠️ Warning: the low UTI value and no obvious signs of duplication (C_dup=1.0) indicate that this is quite probably an asterism, moving group, or artifact, and not a real open cluster.

Close Low extinction Intermediate age

Data

🔍 Search references for Johansson 1 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	–	236.613	-52.329	0.568	-4.849	-5.122	-27.383
Just et al.	2023	236.551	-52.377	–	–	–	–
Bica et al.	2019	236.736	-52.322	–	–	–	–
Kharchenko et al.	2016	236.551	-52.377	–	–	–	–
Dias et al.	2014	236.583	-52.382	–	-3.57	-6.8	-13.0
Kharchenko et al.	2013	236.562	-52.378	–	-6.58	-3.3	-13.0
Dias et al.	2002	236.583	-52.382	–	-3.57	-6.8	-13.0

💡 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
Just et al.	2023	–	–	–	531	–	61	–	–
Kharchenko et al.	2016	0.87	0.53	–	531	–	–	–	–
Kharchenko et al.	2013	0.87	0.53	–	531	–	–	–	–
Dias et al.	2002	0.57	0.53	–	200	–	–	–	–

Visualization

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