upsilon Andromedae Planetary System Data

PlanetOrbital Elements Orbital Period (years) Minimum Mass (ME) Discovery
DesignationName Semimajor Axis (AU)Eccentricity Discoverer NameAnnouncement Date
upsilon And b  0.0590.02 0.01264220 G.W. Marcy & R.P. Butler1996 Jun 23
upsilon And c  0.8280.24 0.6606652 R.P. Butler, et al.1999 Apr 15
upsilon And d  2.560.31 3.5821360 R.P. Butler, et al.1999 Apr 15
1 AU = 1.49597870691·1011 m            1 year = 365.25 days = 31557600 s            1 ME = 5.9742·1024 kg

Copyright © 1996, Alexander J. Willman, Jr. All rights reserved.
The URL of this page is:
This page was last updated: 2001 Apr 17
You may contact Alex at:

Go Back to the table of Known Planetary Systems
Go Back to the list of Alex Willman's Recent Work
Go Back to Alex Willman's Home Page