FSR 0904

(SAI 61; MWSC 731)

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0.91 UTI
0.74
CN
1.0
Cdens
1.0
CC3
1.0
Clit
0.96
Cdup
C3 classification AA
Number of members (P>50%) 97
Radius (P>50% members) 3.8 [arcmin]
  • CN 0.74 Moderately populated
  • Cdens 1.0 Very dense
  • CC3 1.0 Very high quality
  • Clit 1.0 Very well-studied
  • Cdup 0.96 Unique
đŸ“Ĩ Members 📊 Colab đŸ”Ŧ Bayestar19 🔍 CDS 🔍 Simbad 🔍 CDS (Îą, δ) 🔍 Simbad (Îą, δ)

Overview
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FSR 0904 is a moderately populated, very dense object of very high C3 quality. Its parallax locates it at a moderate distance, near the mid-plane, affected by moderate extinction. It is catalogued as a near-solar metallicity, young cluster, but with a large variance across recent sources for the age, metallicity, and mass parameters (see Parameters). It is very well-studied in the literature.

Note: This is a unique object, which shares a very small percentage of members with at least one previously reported entry. See table with shared members information.

Relatively close Moderate extinction Near-solar metallicity Young

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

Cavallo et al. (2024)
Gold sample.

Data
🔍 Search references for FSR 0904 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 – 91.76 19.016 0.46 -0.497 -1.113 35.95
Almeida et al. 2025 91.775 19.024 – – – –
Zhang et al. 2024 91.77 19.014 – – – –
Hunt & Reffert 2024 91.77 19.014 0.473 -0.497 -1.128 37.065
Celli et al. 2024 91.774 19.021 – – – –
Cavallo et al. 2024 91.748 19.015 0.471 – – –
Hunt & Reffert 2023 91.77 19.014 0.473 -0.497 -1.128 37.065
Almeida et al. 2023 91.773 19.026 – – – –
Just et al. 2023 91.754 19.023 – – – –
Dias et al. 2021 91.775 19.024 0.451 -0.441 -1.112 14.007
Cantat-Gaudin et al. 2020 91.774 19.021 0.446 -0.448 -1.107 –
Cantat-Gaudin & Anders 2020 91.774 19.021 0.446 -0.448 -1.107 –
Soubiran et al. 2018 91.774 19.021 – – – 14.08
Cantat-Gaudin et al. 2018 91.774 19.021 0.446 -0.448 -1.107 –
Kharchenko et al. 2016 91.754 19.023 – – – –
Kharchenko et al. 2013 91.762 19.022 – 1.63 -6.72 –
Glushkova et al. 2010 91.73 19.007 – – – –
Froebrich et al. 2007 91.75 19.012 – – – –

💡 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 1.97 2.14 – 31 – 640 – –
Zhang et al. 2024 – – – – -0.199* – – –
Hunt & Reffert 2024 – – – – – 582* – –
Celli et al. 2024 – – – 22 – 516 – –
Cavallo et al. 2024 2.23 2.12 – 141 0.140 – – –
Hunt & Reffert 2023 2.01 1.78 0.71 103 – – – –
Almeida et al. 2023 2.04 2.20 – 15 -0.096 900* 0.48 –
Just et al. 2023 – – – 63 – 38 – –
Dias et al. 2021 1.97 2.14 – 31 -0.100 – – –
Cantat-Gaudin et al. 2020 2.31 1.86 – 22 – – – –
Cantat-Gaudin & Anders 2020 2.10 – – – – – – –
Soubiran et al. 2018 2.10 – – – – – – –
Cantat-Gaudin et al. 2018 2.10 – – – – – – –
Kharchenko et al. 2016 1.43 1.23 – 63 – – – –
Kharchenko et al. 2013 1.43 1.23 – 63 – – – –
Glushkova et al. 2010 1.26 0.43 – 631 – – – –

(*): Indicates that this parameter is assigned more than one value in the corresponding reference.

Cluster % RA DEC Plx pmRA pmDE Rv UTI
OC 0317 43.3 91.73 19.02 0.47 -0.5 -1.11 35.95 0.0
FSR 0903 4.1 91.89 19.13 0.41 -0.15 -1.13 14.48 0.65
HSC 1510 1.0 91.9 19.16 0.47 -0.13 -1.1 14.48 0.02

💡 Note: The % column shows the percentage of members that FSR 0904 shares with each listed object.

Visualization
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FSR 0904 UCC
FSR 0904 HUNT23
FSR 0904 CANTAT20
Galactocentric position diagram