World Library  
Flag as Inappropriate
Email this Article

Upsilon Andromedae e

Article Id: WHEBN0016846108
Reproduction Date:

Title: Upsilon Andromedae e  
Author: World Heritage Encyclopedia
Language: English
Subject: Upsilon Andromedae, HD 10307, HD 40307 g
Publisher: World Heritage Encyclopedia

Upsilon Andromedae e

Upsilon Andromedae e
Exoplanet List of exoplanets
Parent star
Star Upsilon Andromedae A
Constellation Andromeda
Right ascension (α) 01h 36m 47.8s
Declination (δ) +41° 24′ 20″
Apparent magnitude (mV) 4.09
Distance 44.0 ± 0.1 ly
(13.49 ± 0.03 pc)
Spectral type F8V
Mass (m) 1.28 M
Radius (r) 1.480 ± 0.087 R
Temperature (T) 6074 ± 13.1 K
Metallicity [Fe/H] 0
Age 3.3 Gyr
Orbital elements
Semi-major axis (a) 5.2456 ± 0.00067[1] AU
(784.7 Gm)
Periastron (q) 5.2175 ± 0.003 AU
(780.5 Gm)
Apastron (Q) 5.2738 ± 0.0029 AU
(788.9 Gm)
Eccentricity (e) 0.0055±0.0004[2]
Orbital period (P) 3848.86±0.74[2] d
(~10.53946[2] y)
Argument of
(ω) 367.3 ± 2.3[1]°
Physical characteristics
Mass (m) 0.96±0.14[2] MJ
Discovery information
Discovery date November 22, 2010 (announced)
December 2, 2010 (published)
Discoverer(s) Curiel et al.
Discovery method Doppler spectroscopy
Discovery site Baja California
Discovery status Published[1]
Other designations
50 Andromedae e, Upsilon Andromedae Ae
Database references
Extrasolar Planets
Exoplanet Archive data
Open Exoplanet Catalogue data

Upsilon Andromedae e is the outermost extrasolar planet orbiting the star Upsilon Andromedae A in the constellation of Andromeda. This planet is one of the most Jupiter-like exoplanets found in terms of mass and semi-major axis.


This planet was discovered on November 22, 2010, but the discovery paper was not released until December 2.[1] It is the fourth time in 2010 that a fourth planet has been discovered in a planetary system, the others being Gliese 876 e, HD 10180 e, and HR 8799 e; in no other year so far during the exoplanet era has more than one fourth planet been discovered.

Astronomers originally thought that this planet could not exist because it would have made the planetary system unstable and would have been ejected.[3] But in 2007, an island region of stability was reported where a fourth planet could exist.[4]


Upsilon Andromedae e is a so-called “Jupiter-twin” because it has a mass slightly greater than Jupiter's and orbits at a similar distance as Jupiter from the Sun, at precisely 5.2456 AU compared to 5.2043 AU for Jupiter. Although only the minimum mass is determined since inclination is not yet known, its true mass might be much greater. It takes over a decade to orbit the star. At an eccentricity of 0.00536, the planet's orbit is more circular than that of any of the planets in our solar system.[1]


  1. ^ a b c d e
  2. ^ a b c d
  3. ^
  4. ^

This article was sourced from Creative Commons Attribution-ShareAlike License; additional terms may apply. World Heritage Encyclopedia content is assembled from numerous content providers, Open Access Publishing, and in compliance with The Fair Access to Science and Technology Research Act (FASTR), Wikimedia Foundation, Inc., Public Library of Science, The Encyclopedia of Life, Open Book Publishers (OBP), PubMed, U.S. National Library of Medicine, National Center for Biotechnology Information, U.S. National Library of Medicine, National Institutes of Health (NIH), U.S. Department of Health & Human Services, and, which sources content from all federal, state, local, tribal, and territorial government publication portals (.gov, .mil, .edu). Funding for and content contributors is made possible from the U.S. Congress, E-Government Act of 2002.
Crowd sourced content that is contributed to World Heritage Encyclopedia is peer reviewed and edited by our editorial staff to ensure quality scholarly research articles.
By using this site, you agree to the Terms of Use and Privacy Policy. World Heritage Encyclopedia™ is a registered trademark of the World Public Library Association, a non-profit organization.

Copyright © World Library Foundation. All rights reserved. eBooks from Hawaii eBook Library are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.