Automated Planet Finder

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Automated Planet Finder
Automated Planet Finder, Lick Observatory Aug 2019 2.jpg
Alternative namesAPF Edit this on Wikidata
Part ofLick Observatory Edit this on Wikidata
Location(s)Santa Clara County, California
Coordinates37°20′33″N 121°38′18″W / 37.34254148°N 121.63826312°W / 37.34254148; -121.63826312Coordinates: 37°20′33″N 121°38′18″W / 37.34254148°N 121.63826312°W / 37.34254148; -121.63826312 Edit this at Wikidata
Altitude1,280 m (4,200 ft) Edit this at Wikidata
Telescope styleoptical telescope
robotic telescope Edit this on Wikidata
Diameter2.4 m (7 ft 10 in) Edit this at Wikidata Edit this at Wikidata
Automated Planet Finder is located in the United States
Automated Planet Finder
Location of Automated Planet Finder
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The Automated Planet Finder (APF) Telescope a.k.a. Rocky Planet Finder,[1] is a fully robotic 2.4-meter optical telescope at Lick Observatory, situated on the summit of Mount Hamilton, east of San Jose, California, USA.[2] It is designed to search for extrasolar planets in the range of five to twenty times the mass of the Earth. The instrument will examine about 10 stars per night. Over the span of a decade, the telescope is expected to study 1,000 nearby stars for planets.[3] Its estimated cost was $10 million.[4] The total cost-to-completion of the APF project was $12.37 million.[2] First light was originally scheduled for 2006, but delays in the construction of the major components of the telescope[5] pushed this back to August 2013.[1] It was commissioned in August 2013.[6]

The telescope uses high-precision radial velocity measurements to measure the gravitational reflex motion of nearby stars caused by the orbiting of planets. The design goal is to detect stellar motions as small as one meter per second, comparable to a slow walking speed. The main targets will be stars within about 100 light years of the Earth.[1]

Early tests show that the performance of the Ken and Gloria Levy Doppler Spectrometer is meeting the design goals. The spectrometer has high throughput and is meeting the design sensitivity of (1.0 m/s),[1] similar to the radial velocity precision of HARPS and HIRES.


Parts for the telescopes were constructed by international companies:[1]

  • The mirror blank was cast in Russia.
  • The blank was optical figured in Maryland, USA.
  • Assembly was performed in Arizona, USA.
  • The dome was built in Australia.
  • The spectrograph was designed and built in California.
  • It is located on Mount Hamilton in California.

Collaboration with Breakthrough Listen[edit]

The telescope is also being used to search for optical signals coming from laser transmissions from hypothetical extraterrestrial civilizations (search for extraterrestrial intelligence - SETI). This undertaking is performed for the heavily funded Breakthrough Listen project of the Berkeley SETI Research Center.[7]

See also[edit]


  1. ^ a b c d e "Telescopes of the Lick Observatory". University of California Observatories. 2015. Retrieved 2016-08-23.
  2. ^ a b Steven S. Vogt et al., APF - The Lick Observatory Automated Planet Finder, 26 February 2014.
  3. ^ Powell, Hugh. "Major gift supports crucial piece of Automated Planet Finder". UC Santa Cruz. Archived from the original on 2008-06-13.
  4. ^ Perlman, David (August 21, 2010). "Automated Planet Finder telescope seeks life". San Francisco Chronicle.
  5. ^ UCO Director Newsletters: Newsletter #6 October 2009
  6. ^ "Mt. Hamilton Telescopes: Carnegie Double Astrograph".
  7. ^ Zhang, Sarah (20 July 2015). "A Russian Tycoon Is Spending $100 Million to Hunt for Aliens". Wired.

External links[edit]