A measurement of the systematic astrometric error in GeMS and the short-term astrometric precision in ShaneAO

S. M. Ammons, Benoit Neichel, Jessica Lu, Donald T. Gavel, Srikar Srinath, Rosalie McGurk, Alex Rudy, Connie Rockosi, Christian Marois, Bruce MacIntosh, Dmitry Savransky, Raphael Galicher, Eduardo Bendek, Olivier Guyon, Eduardo Marin, Vincent Garrel, Gaetano Sivo

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Citations (Scopus)

Abstract

We measure the long-term systematic component of the astrometric error in the GeMS MCAO system as a function of field radius and Ks magnitude. The experiment uses two epochs of observations of NGC 1851 separated by one month. The systematic component is estimated for each of three field of view cases (15'' radius, 30'' radius, and full field) and each of three distortion correction schemes: 8 DOF/chip + local distortion correction (LDC), 8 DOF/chip with no LDC, and 4 DOF/chip with no LDC. For bright, unsaturated stars with 13 < Ks < 16, the systematic component is < 0.2, 0.3, and 0.4 mas, respectively, for the 15'' radius, 30'' radius, and full field cases, provided that an 8 DOF/chip distortion correction with LDC (for the full-field case) is used to correct distortions. An 8 DOF/chip distortion-correction model always outperforms a 4 DOF/chip model, at all field positions and magnitudes and for all field-of-view cases, indicating the presence of high-order distortion changes. Given the order of the models needed to correct these distortions (∼8 DOF/chip or 32 degrees of freedom total), it is expected that at least 25 stars per square arcminute would be needed to keep systematic errors at less than 0.3 milliarcseconds for multi-year programs. We also estimate the short-term astrometric precision of the newly upgraded Shane AO system with undithered M92 observations. Using a 6-parameter linear transformation to register images, the system delivers ∼0.3 mas astrometric error over short-term observations of 2-3 minutes.

Original languageEnglish (US)
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
PublisherSPIE
Volume9148
ISBN (Print)9780819496164
DOIs
StatePublished - 2014
EventAdaptive Optics Systems IV - Montreal, Canada
Duration: Jun 22 2014Jun 27 2014

Other

OtherAdaptive Optics Systems IV
CountryCanada
CityMontreal
Period6/22/146/27/14

Fingerprint

Systematic Error
Systematic errors
systematic errors
Chip
chips
Radius
radii
Field of View
Stars
field of view
Star
stars
linear transformations
Linear transformations
registers
Linear transformation
degrees of freedom
Degree of freedom
time measurement
Model

Keywords

  • adaptive optics
  • astrometry
  • brown dwarf
  • M92
  • multi-conjugate
  • NGC 1851
  • tomography

ASJC Scopus subject areas

  • Applied Mathematics
  • Computer Science Applications
  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Ammons, S. M., Neichel, B., Lu, J., Gavel, D. T., Srinath, S., McGurk, R., ... Sivo, G. (2014). A measurement of the systematic astrometric error in GeMS and the short-term astrometric precision in ShaneAO. In Proceedings of SPIE - The International Society for Optical Engineering (Vol. 9148). [91481J] SPIE. https://doi.org/10.1117/12.2057233

A measurement of the systematic astrometric error in GeMS and the short-term astrometric precision in ShaneAO. / Ammons, S. M.; Neichel, Benoit; Lu, Jessica; Gavel, Donald T.; Srinath, Srikar; McGurk, Rosalie; Rudy, Alex; Rockosi, Connie; Marois, Christian; MacIntosh, Bruce; Savransky, Dmitry; Galicher, Raphael; Bendek, Eduardo; Guyon, Olivier; Marin, Eduardo; Garrel, Vincent; Sivo, Gaetano.

Proceedings of SPIE - The International Society for Optical Engineering. Vol. 9148 SPIE, 2014. 91481J.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Ammons, SM, Neichel, B, Lu, J, Gavel, DT, Srinath, S, McGurk, R, Rudy, A, Rockosi, C, Marois, C, MacIntosh, B, Savransky, D, Galicher, R, Bendek, E, Guyon, O, Marin, E, Garrel, V & Sivo, G 2014, A measurement of the systematic astrometric error in GeMS and the short-term astrometric precision in ShaneAO. in Proceedings of SPIE - The International Society for Optical Engineering. vol. 9148, 91481J, SPIE, Adaptive Optics Systems IV, Montreal, Canada, 6/22/14. https://doi.org/10.1117/12.2057233
Ammons SM, Neichel B, Lu J, Gavel DT, Srinath S, McGurk R et al. A measurement of the systematic astrometric error in GeMS and the short-term astrometric precision in ShaneAO. In Proceedings of SPIE - The International Society for Optical Engineering. Vol. 9148. SPIE. 2014. 91481J https://doi.org/10.1117/12.2057233
Ammons, S. M. ; Neichel, Benoit ; Lu, Jessica ; Gavel, Donald T. ; Srinath, Srikar ; McGurk, Rosalie ; Rudy, Alex ; Rockosi, Connie ; Marois, Christian ; MacIntosh, Bruce ; Savransky, Dmitry ; Galicher, Raphael ; Bendek, Eduardo ; Guyon, Olivier ; Marin, Eduardo ; Garrel, Vincent ; Sivo, Gaetano. / A measurement of the systematic astrometric error in GeMS and the short-term astrometric precision in ShaneAO. Proceedings of SPIE - The International Society for Optical Engineering. Vol. 9148 SPIE, 2014.
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abstract = "We measure the long-term systematic component of the astrometric error in the GeMS MCAO system as a function of field radius and Ks magnitude. The experiment uses two epochs of observations of NGC 1851 separated by one month. The systematic component is estimated for each of three field of view cases (15'' radius, 30'' radius, and full field) and each of three distortion correction schemes: 8 DOF/chip + local distortion correction (LDC), 8 DOF/chip with no LDC, and 4 DOF/chip with no LDC. For bright, unsaturated stars with 13 < Ks < 16, the systematic component is < 0.2, 0.3, and 0.4 mas, respectively, for the 15'' radius, 30'' radius, and full field cases, provided that an 8 DOF/chip distortion correction with LDC (for the full-field case) is used to correct distortions. An 8 DOF/chip distortion-correction model always outperforms a 4 DOF/chip model, at all field positions and magnitudes and for all field-of-view cases, indicating the presence of high-order distortion changes. Given the order of the models needed to correct these distortions (∼8 DOF/chip or 32 degrees of freedom total), it is expected that at least 25 stars per square arcminute would be needed to keep systematic errors at less than 0.3 milliarcseconds for multi-year programs. We also estimate the short-term astrometric precision of the newly upgraded Shane AO system with undithered M92 observations. Using a 6-parameter linear transformation to register images, the system delivers ∼0.3 mas astrometric error over short-term observations of 2-3 minutes.",
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AU - Ammons, S. M.

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AU - Lu, Jessica

AU - Gavel, Donald T.

AU - Srinath, Srikar

AU - McGurk, Rosalie

AU - Rudy, Alex

AU - Rockosi, Connie

AU - Marois, Christian

AU - MacIntosh, Bruce

AU - Savransky, Dmitry

AU - Galicher, Raphael

AU - Bendek, Eduardo

AU - Guyon, Olivier

AU - Marin, Eduardo

AU - Garrel, Vincent

AU - Sivo, Gaetano

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N2 - We measure the long-term systematic component of the astrometric error in the GeMS MCAO system as a function of field radius and Ks magnitude. The experiment uses two epochs of observations of NGC 1851 separated by one month. The systematic component is estimated for each of three field of view cases (15'' radius, 30'' radius, and full field) and each of three distortion correction schemes: 8 DOF/chip + local distortion correction (LDC), 8 DOF/chip with no LDC, and 4 DOF/chip with no LDC. For bright, unsaturated stars with 13 < Ks < 16, the systematic component is < 0.2, 0.3, and 0.4 mas, respectively, for the 15'' radius, 30'' radius, and full field cases, provided that an 8 DOF/chip distortion correction with LDC (for the full-field case) is used to correct distortions. An 8 DOF/chip distortion-correction model always outperforms a 4 DOF/chip model, at all field positions and magnitudes and for all field-of-view cases, indicating the presence of high-order distortion changes. Given the order of the models needed to correct these distortions (∼8 DOF/chip or 32 degrees of freedom total), it is expected that at least 25 stars per square arcminute would be needed to keep systematic errors at less than 0.3 milliarcseconds for multi-year programs. We also estimate the short-term astrometric precision of the newly upgraded Shane AO system with undithered M92 observations. Using a 6-parameter linear transformation to register images, the system delivers ∼0.3 mas astrometric error over short-term observations of 2-3 minutes.

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