FoF 1800

(LP 1800)

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0.71 UTI
0.81
CN
1.0
Cdens
0.75
CC3
0.5
Clit
1.0
Cdup
C3 classification AB
Number of members (P>50%) 253
Radius (P>50% members) 8.3 [arcmin]
  • CN 0.81 Rich
  • Cdens 1.0 Very dense
  • CC3 0.75 High quality
  • Clit 0.5 Moderately studied
  • Cdup 1.0 Unique
📥 Members 📊 Colab 🔬 Bayestar19 🔍 SciX 🔍 Simbad 🔍 CDS (α, δ) 🔍 Simbad (α, δ)

Overview
FoF 1800 is a rich, very dense object of high C3 quality. Its parallax locates it at a relatively close distance, near the mid-plane, affected by moderate extinction. It is catalogued as a near-solar metallicity, intermediate-age cluster (see Parameters). It is moderately studied in the literature.

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

Relatively close Moderate extinction Near-solar metallicity Intermediate age

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

Cavallo et al. (2024): Gold sample.

Data
Reference Year RA [deg] DEC [deg] Plx [mas] pmRA [mas/yr] pmDE [mas/yr] Rv [km/s]
UCC – 337.846 58.062 0.7 -4.555 -2.699 -31.475
Almeida et al. 2025 337.881 58.04 – – – –
Hunt & Reffert 2024 337.824 58.045 0.698 -4.55 -2.706 -34.687
Cavallo et al. 2024 337.83 58.057 0.702 – – –
Hunt & Reffert 2023 337.824 58.045 0.698 -4.55 -2.706 -34.687
Tarricq et al. 2022 337.792 58.036 0.707 -4.558 -2.715 –
Dias et al. 2021 337.881 58.04 0.706 -4.591 -2.631 -26.683
Cantat-Gaudin et al. 2020 337.843 58.053 0.705 -4.592 -2.648 –
Liu & Pang 2019 337.809 58.069 0.709 -4.571 -2.633 –

💡 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 1.26 1.72 – 146 – 850 – –
Hunt & Reffert 2024 – – – – – 1065* – –
Cavallo et al. 2024 1.34 1.72 – 240 0.220 – – –
Hunt & Reffert 2023 1.35 1.56 1.26 203 – – – –
Tarricq et al. 2022 1.35 – – 355 – – – –
Dias et al. 2021 1.26 1.72 – 146 0.093 – – –
Cantat-Gaudin et al. 2020 1.39 1.25 – 331 – – – –
Liu & Pang 2019 – – – 479 -1.000 – – –

💡 Note: The parameters are sometimes transformed from their original values to match the format of the columns shown here, see FAQ. The columns DAv, Bfr, BSS correspond to differential extinction, binary fraction, and blue stragglers, respectively. BSS values can be listed as fractions or integers.
(*): indicates that this parameter is assigned more than one value in the corresponding reference.

Cluster % RA DEC Plx pmRA pmDE Rv UTI
UBC 170 100.0 337.86 58.06 0.7 -4.56 -2.71 -30.24 0.16

💡 Note: The % column shows the percentage of members that FoF 1800 shares with each listed object.

Visualization
FoF 1800 UCC
FoF 1800 HUNT23
FoF 1800 CANTAT20
Galactocentric position diagram

💡 Note: How are the galactocentric plots generated? See FAQ.