IC 4996

(MWSC 3297)

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0.95 UTI
0.77
CN
1.0
Cdens
1.0
CC3
1.0
Clit
1.0
Cdup
N50 (P>50% members) 163
Stellar density (N50/rad) 72.2 [N/pc2]
C3 classification AA
  • CN 0.77 Rich
  • Cdens 1.0 Very dense
  • CC3 1.0 Very high quality
  • Clit 1.0 Very well-studied
  • Cdup 1.0 Unique
đŸ“Ĩ Members 📊 Colab đŸ”Ŧ Bayestar19 MOCAMOCA 🔍 CDS 🔍 Simbad 🔍 CDS (Îą, δ) 🔍 Simbad (Îą, δ)

Overview
ℹī¸
IC 4996 is a rich, very dense object of very high C3 quality. Its parallax locates it at a moderate distance, above the mid-plane, affected by moderate extinction. It is catalogued as a near-solar metallicity, very young cluster, but with a large variance across recent sources for the metallicity parameter (see Parameters). It is very well-studied in the literature.

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

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

Cavallo et al. (2024)
Gold sample.

Data
🔍 Search references for IC 4996 in: SciX Simbad
ℹī¸
Reference Year RA [deg] DEC [deg] Plx [mas] pmRA [mas/yr] pmDE [mas/yr] Rv [km/s]
UCC 99999– 304.134 37.648 0.484 -2.632 -5.36 -19.944
Li et al. 2025 304.135 37.649 0.487 -2.681 -5.348 –
Almeida et al. 2025 304.138 37.649 – – – –
Zhang et al. 2024 304.14 37.648 – – – –
Hunt & Reffert 2024 304.14 37.648 0.486 -2.636 -5.351 -14.255
Celli et al. 2024 304.135 37.649 – – – –
Cavallo et al. 2024 304.152 37.606 0.486 – – –
Hunt & Reffert 2023 304.14 37.648 0.486 -2.636 -5.351 -14.255
Almeida et al. 2023 304.141 37.65 – – – –
Just et al. 2023 304.135 37.637 – – – –
Jaehnig et al. 2021 304.145 37.644 0.521 -2.674 -5.309 –
Rain et al. 2021 304.135 37.649 0.487 -2.681 -5.348 –
Dias et al. 2021 304.138 37.649 0.489 -2.694 -5.353 –
Cantat-Gaudin et al. 2020 304.135 37.649 0.487 -2.681 -5.348 –
Cantat-Gaudin & Anders 2020 304.135 37.649 0.487 -2.681 -5.348 –
Dias et al. 2019 304.129 37.655 0.479 -2.652 -5.272 -34.614
Soubiran et al. 2018 304.135 37.649 – – – -29.11
Cantat-Gaudin et al. 2018 304.135 37.649 0.487 -2.681 -5.348 –
Loktin & Popova 2017 304.14 37.64 – -1.229 -0.877 -2.5
Kharchenko et al. 2016 304.135 37.637 – – – –
Dias et al. 2014 304.129 37.655 – -2.95 -4.1 –
Kharchenko et al. 2013 304.14 37.64 – -1.78 -3.67 -2.5
Gozha et al. 2012 304.129 37.655 – – – –
Piskunov et al. 2008 304.119 37.633 – – – –
Kharchenko et al. 2007 304.12 37.63 – 0.16 – -18.75
van den Bergh 2006 304.125 37.633 – – – –
Kharchenko et al. 2005 304.12 37.63 – -1.78 -5.42 -18.75
Kharchenko et al. 2003 304.12 37.66 – -1.53 -5.93 –
Chen et al. 2003 304.165 37.669 – -1.98 -5.25 -22.0
Dias et al. 2002 304.129 37.655 – -0.53 -4.34 -13.0
Dambis 1999 304.125 37.633 – – – –

💡 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] Bfrac BSS
UCC 99999– 1.88 1.86 2.08 10 -0.143 488 0.75 0.0
Li et al. 2025 1.66 1.89 – 11 -0.143 – – –
Almeida et al. 2025 1.88 1.81 – 12 – 475 – –
Zhang et al. 2024 – – – – -0.189(1) – – –
Hunt & Reffert 2024 – – – – – 955(1) – –
Celli et al. 2024 – – – 11 – 437 – –
Cavallo et al. 2024 1.80 1.75 – 9 0.070 – – –
Hunt & Reffert 2023 1.94 1.74 2.08 8 – – – –
Almeida et al. 2023 1.91 1.86 – 11 0.076 500(1) 0.75 –
Just et al. 2023 – – – 14 – 426 – –
Jaehnig et al. 2021 1.92(1) – – – – – – –
Rain et al. 2021 1.94 2.20 – 7 – – – 0
Dias et al. 2021 1.88 1.81 – 12 0.182 – – –
Cantat-Gaudin et al. 2020 2.04 1.50 – 11 – – – –
Cantat-Gaudin & Anders 2020 1.94 – – – – – – –
Dias et al. 2019 2.12 1.71 – 10 -0.236 – – –
Soubiran et al. 2018 1.94 – – – – – – –
Cantat-Gaudin et al. 2018 1.94 – – – – – – –
Loktin & Popova 2017 1.74 2.06 – 9 – – – –
Kharchenko et al. 2016 1.76 1.62 – 14 – – – –
Kharchenko et al. 2013 1.76 1.62 – 14 – – – –
Gozha et al. 2012 2.40 – – 7 -0.470 1096 – –
Piskunov et al. 2008 1.73 1.86 – 6 – – – –
van den Bergh 2006 1.73 2.08 – 9 – – – –
Kharchenko et al. 2005 1.73 1.86 – 6 – – – –
Kharchenko et al. 2003 1.73 1.86 – – – – – –
Chen et al. 2003 1.73 – – 0 – – – –
Dias et al. 2002 2.40 2.20 – 7 – – – –
Dambis 1999 1.36 1.99 – 10 – – – –

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

Cluster % RA DEC Plx pmRA pmDE Rv UTI
CWWDL 10254 3.1 304.18 37.44 0.49 -2.72 -5.35 -27.25 0.18
CWWDL 13932 0.6 303.72 37.4 0.5 -2.75 -5.62 -26.78 0.05

💡 Note: The % column shows the percentage of members that IC 4996 shares with each listed object.

Visualization
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IC 4996 UCC
IC 4996 HUNT23
IC 4996 CANTAT20
Galactocentric position diagram