Though smaller than its partner, the companion star in Eta Carinae is also massive, weighing in at about 30 times the mass of the Sun. It is losing matter at a rate that is about a hundred times lower than its partner, but still a prodigious weight loss compared to most other stars. The companion star beats the bigger star in wind speed, with its wind clocking in almost ten times faster.
Fast Facts for Eta Carinae:
Release Date: August 26, 2014
Scale: Image is about 2 arcmin across (about 4.6 light years)
Category: Normal Stars & Star Clusters
Coordinates (J2000): RA 10h 45m 04s | Dec -59° 41' 03"
Observation Date: 8 pointings between Sep 1999 and Feb 2009
Observation Time: 30 hours (1 day 6 hours).
Obs. ID: 50, 1249, 4455, 9933-9937
References: Hamaguchi, K. et al, 2014, ApJ 784, 125; arXiv:1401.5870
Color Code: X-ray (Red, Green, Blue)
Distance Estimate: About 7,500 light years