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Vega System

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Exoplanetary Scratchpad

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Vega is also known as Alpha Lyrae, HR 7001, HD 172167, and Gl 721. It is the fifth brightest star in the night sky the second brightest star visible from the Northern hemisphere, and brightest star in the Northern Summer. It is part of the Summer Triangle. It was the first star to be photographed in 1850. It is a slightly bluish star (A0) with about 2.15 times the sun's mass and 2.7 its diameter. It was at first estimated to be about 200 Million Years old, but now thought to be closer to 700. It was found to be rotating so fast that the equator bulges significantly (23%) and is cooler at its poles. Nearby star with one of the first detected circumstellar disks. The star is pointed nearly pole-on from the Earth, so it is ideal for the observation of dust disks. There have been many studies suggesting planets are responsible for features found in the disk. Two bright "clumps" of dust were identified and thought to be due to the gravitational effects of an eccentric planet's orbit. It was surmised that this disk was caused by a collision between Pluto sized objects. A distinct asteroid belt and kuiper belt at distance scales that dwarf our Solar Systems was found to exist, which suggest outer planets clearing out the space in between. These planets cannot be detected at the present, but could be detected by the James Webb Space Telescope. One of 5 PICTURE-C targets selected for sub-orbital coronograph observation.

Vega System Web PagesEdit


Vega System In the NewsEdit

Dust Disk Discovered by IRAS (1983)Edit

Follow-Up Observations (1984-1994)Edit

Dust Disc First Imaged by JACA (1998)Edit

Planet Detected With Disk Modelling (2000)Edit

Ring Arc Planet Announced(2002)Edit

Clump Planet Announced (2002)Edit

Migrating Neptune Announced (2003)Edit

Disk Caused By Plutonic Collision (Jan 2005)Edit

Spitzer Images a Bigger Dust Disk (2005)Edit

Vega's Bulge Discovered (2005)Edit

Distinct Asteroid and Kuiper Belt Detected with Suspected Outer Planets In Between (2013)Edit

Selected As PICTURE-C Suborbital Coronograph TargetEdit

See Vega System, Alsafi System, Epsilon Eridani System, Altair System, Tau Ceti System

See AlsoEdit

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