Trumpler 8

(Collinder 167; NGC 2479; ESO 561 01; FSR 1271; OCL 623; MWSC 1380)

UTI: UCC Trust Index C_N C_dens C_C3 C_lit C_dup 0.78 1.0 1.0 1.0 1.0 Trumpler 8 is a rich, very dense object of very high C3 quality. It is very well-studied in the literature. This object shares a large percentage of members with a later reported entry.
C3	N_50	r_50
AA	192	6.0

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Positions

Reference	RA	DEC	Plx	pmRA	pmDE	Rv
Dias et al. (2002)	118.775	-17.71	–	-2.94	-1.33	38.17
Kharchenko et al. (2012)	118.785	-17.73	–	-7.14	4.72	–
Loktin & Popova (2017)	118.77	-17.738	–	-6.64	3.632	38.17
Bica et al. (2019)	118.777	-17.715	–	–	–	–
Cantat-Gaudin et al. (2020)	118.762	-17.732	0.626	-4.318	1.053	–
Donor et al. (2020)	118.785	-17.73	–	-4.3	1.09	41.6
Dias et al. (2021)	118.755	-17.731	0.623	-4.334	1.059	40.969
Hunt & Reffert (2023)	118.772	-17.734	0.611	-4.326	1.097	34.536
Cavallo et al. (2024)	118.765	-17.731	0.612	–	–	–
Hunt & Reffert (2024)	118.772	-17.734	0.611	-4.326	1.097	34.536
Hu & Soubiran (2025)	118.765	-17.73	–	–	–	–
UCC	118.768	-17.735	0.607	-4.318	1.097	40.212

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Estimated members

1 2 3

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Fundamental parameters

Reference	Values
Dias et al. (2002)	E(B-V)=0.05, Dist=1585.0, Age=9.0
Kharchenko et al. (2012)	e_bv=0.083, distance=1363, log_age=9.015
Loktin & Popova (2017)	E(B-V)=0.185, Dmod=12.108, logt=8.77
Cantat-Gaudin et al. (2020)	AVNN=0.15, DMNN=10.97, AgeNN=8.99
Donor et al. (2020)	Fe/H=-0.03
Dias et al. (2021)	Av=0.259, Dist=1501, logage=9.086, [Fe/H]=-0.104
Hunt & Reffert (2023)	AV50=0.099, diffAV50=0.469, MOD50=10.912, logAge50=9.117
Cavallo et al. (2024)	AV50=0.19, dMod50=10.9, logAge50=9.13, [Fe/H]50=-0.02
Hunt & Reffert (2024)	MassJ=678.396
Hu & Soubiran (2025)	MA22=-0.15, MA23f=-0.2, MA23g=-0.04, MZ23=-0.05, MK24=-0.13, MF24=-0.07

Search coordinates in Bayestar19

Cluster region

Objects with shared members

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
UBC 226	97.9	118.77	-17.73	0.61	-4.32	1.1	40.21	0.0