FSR 1698

(MWSC 2289)

0.52 UTI

0.52

C_N

0.23

C_dens

1.0

C_C3

0.42

C_lit

1.0

C_dup

N_m (P>50%) 55

Core radius and density 2.0 [pc], 1.2 [pc^-2]

C3 classification AA

C_N 0.52 Moderately populated
C_dens 0.23 Very loose
C_C3 1.0 Very high quality
C_lit 0.42 Poorly studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

ℹ️

FSR 1698 is a moderately populated, very loose object of very high C3 quality. Its parallax locates it at a moderate^* distance, below the mid-plane, affected by moderate extinction. It is catalogued as a massive, near-solar metallicity, intermediate-age cluster, but with a large variance across recent sources for the age, metallicity, and mass parameters (see Parameters). It is poorly studied in the literature.

(*): The parallax distance estimate (~3.50 kpc) differs significantly from the median photometric distance (~2.23 kpc).

Relatively close Moderate extinction Massive Near-solar metallicity Intermediate age

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

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD classes: 0.10 (50th percentile), true positive? (human-assigned).

Hunt & Reffert (2023)
Classified as open cluster. CMD classes: 0.10 (50th percentile), true positive? (human-assigned).

Data

🔍 Search references for FSR 1698 in: SciX Simbad

ℹ️

Reference	Year	RA [deg]	DEC [deg]	Plx [mas]	pmRA [mas/yr]	pmDE [mas/yr]	Rv [km/s]
UCC	99999–	230.233	-59.622	0.285	-3.923	-3.585	51.426
Almeida et al.	2025	230.234	-59.627	–	–	–	–
Hunt & Reffert	2024	230.233	-59.622	0.289	-3.901	-3.576	51.566
Cavallo et al.	2024	230.251	-59.607	0.29	–	–	–
Hunt & Reffert	2023	230.233	-59.622	0.289	-3.901	-3.576	51.566
Just et al.	2023	230.228	-59.618	–	–	–	–
Dias et al.	2021	230.234	-59.627	0.248	-4.028	-3.531	–
Dias et al.	2018	–	–	–	-2.68	-2.49	–
Dib et al.	2018	230.241	-59.62	–	–	–	–
Sampedro et al.	2017	230.242	-59.628	–	-6.43	-3.78	–
Joshi et al.	2016	230.241	-59.62	–	–	–	–
Kharchenko et al.	2016	230.228	-59.618	–	–	–	–
Dias et al.	2014	230.242	-59.628	–	-6.07	-4.12	–
Kharchenko et al.	2013	230.241	-59.62	–	-5.19	-2.3	–
Froebrich et al.	2007	230.242	-59.628	–	–	–	–
Dias et al.	2002	230.242	-59.628	–	-6.07	-4.12	–

💡 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–	2.23	2.91	2.33	363	0.399	1022	–	–
Almeida et al.	2025	3.12	2.91	–	14	–	1022	–	–
Hunt & Reffert	2024	3.07	3.23	2.33	12	–	1130⁽¹⁾	–	–
Cavallo et al.	2024	2.90	3.16	–	32	0.570	–	–	–
Hunt & Reffert	2023	3.07	3.23	2.33	12	–	–	–	–
Just et al.	2023	–	–	–	363	–	199	–	–
Dias et al.	2021	3.12	2.91	–	14	0.228	–	–	–
Dib et al.	2018	1.56	–	–	363	–	–	–	–
Joshi et al.	2016	1.56	2.76	–	363	–	–	–	–
Kharchenko et al.	2016	1.56	2.76	–	363	–	–	–	–
Kharchenko et al.	2013	1.56	2.76	–	363	–	–	–	–
Dias et al.	2002	1.56	2.76	–	363	–	–	–	–

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

Visualization

ℹ️

1 2