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Apache Point Observatory

ARCSAT and SDSS telescope buildings at the Apache Point Observatory.
Alternative names	APO
Organization	Astrophysical Research Consortium
Observatory code	705, 645
Location	Sunspot, New Mexico
Coordinates	32°46′49″N 105°49′13″W / 32.78028°N 105.82028°W / 32.78028; -105.82028
Altitude	2,788 meters (9,147 ft)
Weather	65% clear nights
Established	1985 (1985)
Website	www.apo.nmsu.edu
Telescopes
Astrophysical Research Consortium telescope 3.5 m reflector Sloan Digital Sky Survey telescope 2.5 m reflector New Mexico State University telescope 1.0 m reflector ARCSAT 0.5 m reflector
Location of Apache Point Observatory
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The Apache Point Observatory (APO; obs. code: 705) is an astronomical observatory located in the Sacramento Mountains in Sunspot, New Mexico, United States, approximately 18 miles (29 km) south of Cloudcroft. The observatory is operated by New Mexico State University (NMSU) and owned by the Astrophysical Research Consortium (ARC). Access to the telescopes and buildings is private and restricted.

History

The ARC was formed in 1984 with the goal of building the 3.5 m telescope. It originally consisted of five institutions: New Mexico State University, University of Washington, University of Chicago, Princeton University, and Washington State University, some of which have since withdrawn.

Several additional organizations have joined over time: Johns Hopkins University, University of Colorado, University of Virginia, Georgia State University, University of Oklahoma, University of Wyoming, and Brigham Young University. Funding for the 3.5 m and 0.5 m telescopes comes from the consortium members, but funds for the 2.5 m telescope come from a much wider array of sources. The 1.0 m telescope is supported exclusively by NMSU.

Telescopes

ARC 3.5 m

The ARC 3.5 m (140 in) telescope is a Ritchey-Chretien reflector on an alt-azimuth mount with instruments attached at several focal points. Construction of the building began in 1985, but full operations of the telescope were delayed until November 1994 due to problems with fabricating the primary mirror. From 1991 until early 1993, the telescope was fitted with a 1.8 m mirror, now located at Rothney Astrophysical Observatory under a cost-sharing agreement.

There are a variety of optical and near-infrared instruments available for the 3.5 m telescope, including:

• The ARC echelle spectrometer (ARCES) uses a 2048 × 2048 pixel CCD and has a resolution of ${\displaystyle R\sim 31{,}500}$.
• The Double Imaging Spectrometer (DIS) is a low-resolution optical spectrometer.
• KOSMOS, on long-term loan from NOIRLab, is a low-resolution optical spectrometer.
• The Near Infrared Camera/Fabry–Pérot Spectrometer (NICFPS) was developed at the University of Colorado. It uses a 1024 × 1024 H1RG HgCdTe infrared detector and a near-infrared Fabry–Pérot interferometer. It has many narrow band filters, including H2, , and . It is unique among astronomical Fabry-Pérot devices in that it is cooled with liquid nitrogen.
• The Astrophysical Research Consortium Telescope Imaging Camera (ARCTIC) is an optical imaging instrument with a 4096 × 4096 pixel CCD.
• TripleSpec (Tspec) is a near infrared spectrograph which provides continuous wavelength coverage over the range 0.94–2.46 μm at moderate resolution (${\displaystyle R\sim 3500}$, depending on the choice of slit).
• Agile is a high-speed imager with a 1024 x 1024 frame transfer CCD.

The 3.5 m telescope is also used by the Apache Point Observatory Lunar Laser-ranging Operation (APOLLO) lunar-ranging project. The APOLLO laser has been operational since October 2005, and routinely accomplishes millimeter-level range accuracy between the Earth and the Moon.

Observations using the 3.5 m telescope can be carried out remotely by observers using TUI, the Telescope User Interface, via the internet.

SDSS 2.5 m

The SDSS 2.5 m (98 in) telescope is used for the Sloan Digital Sky Survey, and began operating in 2000. It is a Ritchey-Chretien reflector on an alt-azimuth mount housed under a roll-off enclosure. It was designed with an unusually large 3° field of view to better support its primary task of surveying the entire sky.

NMSU 1.0 m

The NMSU 1.0 m (39 in) telescope is a Ritchey-Chretien reflector set on an alt-azimuth mount, and was completed in 1994. A 2048 × 2048 CCD mounted at the Nasmyth focus provides at 15.7 arcminute view of the sky.

0.5 m ARCSAT

The ARC Small Aperture Telescope (ARCSAT) was previously called the Photometric Telescope (PT) when it was part of the SDSS project. It is a 0.5 m (20 in) reflecting telescope on an equatorial mount, with a single CCD camera cooled by a CryoTiger unit. It was built in 1991, moved from its previous location in 1998, and used by the SDSS until 2005. It is currently used for small research projects.

Former telescopes

• A 0.6 m (24 in) reflecting telescope was built in 1993 to monitor sky conditions for the SDSS project. It never operated in a satisfactory manner, and was replaced with the 0.5 m PT.

List of discovered minor planets

The Minor Planet Center credits the discovery of the following minor planets directly to the Apache Point Observatory:

See also

• List of astronomical observatories
• List of largest optical reflecting telescopes
• List of minor planet discoverers § Discovering dedicated institutions
• Sunspot Solar Observatory

References

1. "Public Access and Tours". Apache Point Observatory. 20 August 2018.
2. Holtzman, Jon; et al. (2009-03-15). Apache Point Observatory: Facilities, Operations, and Partnerships. Astro2010: The Astronomy and Astrophysics Decadal Survey (Report). National Academies. Retrieved 2012-01-14.
3. Peterson, Jim. "A Brief History of the Astrophysical Research Consortium (ARC) and the Apache Point Observatory (APO)". Apache Point Observatory. Archived from the original on 2011-08-11. Retrieved 2012-01-07.
4. "Annual Reports of Astronomical Observatories and Departments: Apache Point Observatory, Astrophysical Research Consortium". Bulletin of the American Astronomical Society. 24: 17. 1992. Bibcode:1992BAAS...24...17.
5. York, D. G. (1994). "University of Chicago, Apache Point Observatory/Department of Astronomy and Astrophysics, Chicago, Illinois 60637". Bulletin of the Astronomical Society. 26 (1): 58. Bibcode:1994BAAS...26...58Y.
6. "ARC 3.5m | ARCES (Echelle)". Apache Point Observatory. Retrieved 2012-01-07.
7. "ARC 3.5m | DIS". Apache Point Observatory. Retrieved 2012-01-07.
8. "ARC 3.5m | NICFPS". Apache Point Observatory. Retrieved 2012-01-07.
9. "ARC 3.5m | Arctic".
10. "ARC 3.5m | TripleSpec". Apache Point Observatory. Retrieved 2012-01-07.
11. "APOLLO". Apache Point Observatory Lunar Laser-ranging Operation. Retrieved 2012-01-07.
12. Battat, J. B. R.; Murphy, T. W.; Adelberger, E. G.; Gillespie, B.; Hoyle, C. D.; McMillan, R. J.; Michelsen, E. L.; Nordtvedt, K.; Orin, A. E.; Stubbs, C. W.; Swanson, H. E. (1 January 2009). "The Apache Point Observatory Lunar Laser-ranging Operation (APOLLO): Two Years of Millimeter-Precision Measurements of the Earth-Moon Range1". Publications of the Astronomical Society of the Pacific. 121 (875): 29–40. Bibcode:2009PASP..121...29B. doi:10.1086/596748.
13. "TUI Telescope User Interface". Apache Point Observatory. Retrieved 2012-01-07.
14. Gunn, James E.; et al. (1 April 2006). "The 2.5 m Telescope of the Sloan Digital Sky Survey". The Astronomical Journal. 131 (4): 2332–2359. arXiv:astro-ph/0602326. Bibcode:2006AJ....131.2332G. doi:10.1086/500975. S2CID 7080617.
15. Holtzman, Jon A.; Harrison, Thomas E.; Coughlin, Jeffrey L. (1 January 2010). "The NMSU 1 m Telescope at Apache Point Observatory". Advances in Astronomy. 2010: 193086. Bibcode:2010AdAst2010E..46H. doi:10.1155/2010/193086.
16. "Annual Reports of Astronomical Observatories and Departments: Astrophysical Research Consortium, Apache Point Observatory". Bulletin of the American Astronomical Society. 27: 9. 1995. Bibcode:1995BAAS...27....9.
17. "APO 1m telescope Home Page". Apache Point Observatory. Retrieved 2012-01-07.
18. "Astrophysical Research Consortium Small Aperture Telescope". Apache Point Observatory. Retrieved 2012-01-07.
19. ^ "History of the 20-inch Telescope". Apache Point Observatory. Retrieved 2012-01-07.
20. "Minor Planet Discoverers (by number)". Minor Planet Center. 14 November 2016. Retrieved 29 November 2016.

External links

• Astronomy Department at NMSU
• Sloan Digital Sky Survey homepage
• Apache Point Clear Sky Clock Forecasts of observing conditions.

• Astronomy
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• Astronomical observatories in New Mexico
• Buildings and structures in Otero County, New Mexico
• Minor-planet discovering observatories
• Tourist attractions in Otero County, New Mexico
• 1985 establishments in New Mexico