ESO 489 01

0.18 UTI

0.25

C_N

0.04

C_dens

0.5

C_C3

0.06

C_lit

1.0

C_dup

N_m (P>50%) 25

Core radius and density 2.5 [pc], 0.2 [pc^-2]

C3 classification DA

C_N 0.25 Poorly populated
C_dens 0.04 Very loose
C_C3 0.5 Intermediate quality
C_lit 0.06 Rarely studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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ESO 489 01 is a poorly populated, very loose object of intermediate C3 quality. Its parallax locates it at a very close^* distance, below the mid-plane, affected by low extinction. It is catalogued as an intermediate-age cluster (see Parameters). It is rarely studied in the literature.

(*): The parallax distance estimate (~0.31 kpc) differs significantly from the median photometric distance (~2.16 kpc).

Note: This object shares a large percentage of members with 2 later reported entries. See table with shared members information.

⚠️ 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.

Relatively close Low extinction Intermediate age

Dias et al. (2002)
No cluster (Carraro, G. 2016, MNRAS 455, 4031); cat V3.5 (Jan 2016)

Data

🔍 Search references for ESO 489 01 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–	90.79	-27.207	3.186	-6.544	0.015	3.263
He et al.	2022	90.407	-27.819	3.245	-6.577	-0.154	–
Loktin & Popova	2017	91.245	-26.732	–	-0.002	0.08	–
Sampedro et al.	2017	91.242	-26.733	–	–	–	–
Dias et al.	2014	91.242	-26.733	–	-0.63	0.33	–

💡 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–	2.16	0.255	–	550	–	–	–	–
He et al.	2022	–	0.15	–	100	–	–	–	–
Loktin & Popova	2017	2.16	0.36	–	1000	–	–	–	–

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
Theia 229	80.0	90.59	-27.98	3.2	-6.52	-0.17	2.03	0.11
OCSN 81	72.0	91.01	-27.1	3.19	-6.59	0.26	3.26	0.01

💡 Note: The % column shows the percentage of members that ESO 489 01 shares with each listed object.

Visualization

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