Astrometric results of observations of mutual occultations and eclipses of the Uranian satellites in 2007

J. E. Arlot, N. V. Emelyanov, Z. Aslan, M. Assafin, J. Bel, B. C. Bhatt, F. Braga-Ribas, J. I.B. Camargo, R. Casas, F. Colas, J. F. Coliac, C. Dumas, C. K. Ellington, E. Forné, E. Frappa, I. Khamitov, C. Miller, R. J. Modic, Dk Sahu, B. SicardyP. Tanga, P. Valdes Sada, R. Vasundhara, R. Vieira-Martins

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Context. The photometry of mutual occultations and eclipses of natural planetary satellites can be used to infer very accurate astrometric data. This can be achieved by processing the light curves of the satellites observed during international campaigns of photometric observations of these mutual events. Aims. This work focuses on processing the complete database of photometric observations of the mutual occultations and eclipses of the Uranian satellites made during the international campaign in 2007. The final goal is to derive new accurate astrometric data. Methods. We used an accurate photometric model of mutual events that explicitly depends on parameters that these accurate observations should be sensitive to, including the albedos of the satellites. Our original method is applied to derive astrometric data in relative positions from photometric observations of mutual occultations and eclipses of the Uranian satellites. Results. We process the 41 light-curves obtained during the international campaign of photometric observations of the Uranian satellites in 2007. The root-mean-square (rms) of the residuals "observations minus calculations" (O-C) with respect to theory for the best 34 observations are equal to 10.3 and 17.7 mas in right ascension and declination, respectively. For five observations only the position angle was derived. Topocentric or heliocentric angular differences for satellites pairs were obtained from 25 central instant offsets between observation and theory during the time period from May 4, 2007 to January 4, 2008. Conclusions. The rms of the residuals is from 10 to 20 mas that corresponds in situ to 10 to 20 km. These mutual event observations appear to be the most accurate astrometric ground-based observations of the major Uranian satellites to-date and should be used for dynamical purposes. © 2013 ESO.
Original languageEnglish
JournalAstronomy and Astrophysics
DOIs
Publication statusPublished - 1 Jan 2013
Externally publishedYes

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occultation
eclipses
planetary satellite
light curve
albedo
declination
natural satellites
European Southern Observatory
photometry

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Arlot, J. E. ; Emelyanov, N. V. ; Aslan, Z. ; Assafin, M. ; Bel, J. ; Bhatt, B. C. ; Braga-Ribas, F. ; Camargo, J. I.B. ; Casas, R. ; Colas, F. ; Coliac, J. F. ; Dumas, C. ; Ellington, C. K. ; Forné, E. ; Frappa, E. ; Khamitov, I. ; Miller, C. ; Modic, R. J. ; Sahu, Dk ; Sicardy, B. ; Tanga, P. ; Valdes Sada, P. ; Vasundhara, R. ; Vieira-Martins, R. / Astrometric results of observations of mutual occultations and eclipses of the Uranian satellites in 2007. In: Astronomy and Astrophysics. 2013.
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title = "Astrometric results of observations of mutual occultations and eclipses of the Uranian satellites in 2007",
abstract = "Context. The photometry of mutual occultations and eclipses of natural planetary satellites can be used to infer very accurate astrometric data. This can be achieved by processing the light curves of the satellites observed during international campaigns of photometric observations of these mutual events. Aims. This work focuses on processing the complete database of photometric observations of the mutual occultations and eclipses of the Uranian satellites made during the international campaign in 2007. The final goal is to derive new accurate astrometric data. Methods. We used an accurate photometric model of mutual events that explicitly depends on parameters that these accurate observations should be sensitive to, including the albedos of the satellites. Our original method is applied to derive astrometric data in relative positions from photometric observations of mutual occultations and eclipses of the Uranian satellites. Results. We process the 41 light-curves obtained during the international campaign of photometric observations of the Uranian satellites in 2007. The root-mean-square (rms) of the residuals {"}observations minus calculations{"} (O-C) with respect to theory for the best 34 observations are equal to 10.3 and 17.7 mas in right ascension and declination, respectively. For five observations only the position angle was derived. Topocentric or heliocentric angular differences for satellites pairs were obtained from 25 central instant offsets between observation and theory during the time period from May 4, 2007 to January 4, 2008. Conclusions. The rms of the residuals is from 10 to 20 mas that corresponds in situ to 10 to 20 km. These mutual event observations appear to be the most accurate astrometric ground-based observations of the major Uranian satellites to-date and should be used for dynamical purposes. {\circledC} 2013 ESO.",
author = "Arlot, {J. E.} and Emelyanov, {N. V.} and Z. Aslan and M. Assafin and J. Bel and Bhatt, {B. C.} and F. Braga-Ribas and Camargo, {J. I.B.} and R. Casas and F. Colas and Coliac, {J. F.} and C. Dumas and Ellington, {C. K.} and E. Forn{\'e} and E. Frappa and I. Khamitov and C. Miller and Modic, {R. J.} and Dk Sahu and B. Sicardy and P. Tanga and {Valdes Sada}, P. and R. Vasundhara and R. Vieira-Martins",
year = "2013",
month = "1",
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doi = "10.1051/0004-6361/201322039",
language = "English",
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Arlot, JE, Emelyanov, NV, Aslan, Z, Assafin, M, Bel, J, Bhatt, BC, Braga-Ribas, F, Camargo, JIB, Casas, R, Colas, F, Coliac, JF, Dumas, C, Ellington, CK, Forné, E, Frappa, E, Khamitov, I, Miller, C, Modic, RJ, Sahu, D, Sicardy, B, Tanga, P, Valdes Sada, P, Vasundhara, R & Vieira-Martins, R 2013, 'Astrometric results of observations of mutual occultations and eclipses of the Uranian satellites in 2007', Astronomy and Astrophysics. https://doi.org/10.1051/0004-6361/201322039

Astrometric results of observations of mutual occultations and eclipses of the Uranian satellites in 2007. / Arlot, J. E.; Emelyanov, N. V.; Aslan, Z.; Assafin, M.; Bel, J.; Bhatt, B. C.; Braga-Ribas, F.; Camargo, J. I.B.; Casas, R.; Colas, F.; Coliac, J. F.; Dumas, C.; Ellington, C. K.; Forné, E.; Frappa, E.; Khamitov, I.; Miller, C.; Modic, R. J.; Sahu, Dk; Sicardy, B.; Tanga, P.; Valdes Sada, P.; Vasundhara, R.; Vieira-Martins, R.

In: Astronomy and Astrophysics, 01.01.2013.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Astrometric results of observations of mutual occultations and eclipses of the Uranian satellites in 2007

AU - Arlot, J. E.

AU - Emelyanov, N. V.

AU - Aslan, Z.

AU - Assafin, M.

AU - Bel, J.

AU - Bhatt, B. C.

AU - Braga-Ribas, F.

AU - Camargo, J. I.B.

AU - Casas, R.

AU - Colas, F.

AU - Coliac, J. F.

AU - Dumas, C.

AU - Ellington, C. K.

AU - Forné, E.

AU - Frappa, E.

AU - Khamitov, I.

AU - Miller, C.

AU - Modic, R. J.

AU - Sahu, Dk

AU - Sicardy, B.

AU - Tanga, P.

AU - Valdes Sada, P.

AU - Vasundhara, R.

AU - Vieira-Martins, R.

PY - 2013/1/1

Y1 - 2013/1/1

N2 - Context. The photometry of mutual occultations and eclipses of natural planetary satellites can be used to infer very accurate astrometric data. This can be achieved by processing the light curves of the satellites observed during international campaigns of photometric observations of these mutual events. Aims. This work focuses on processing the complete database of photometric observations of the mutual occultations and eclipses of the Uranian satellites made during the international campaign in 2007. The final goal is to derive new accurate astrometric data. Methods. We used an accurate photometric model of mutual events that explicitly depends on parameters that these accurate observations should be sensitive to, including the albedos of the satellites. Our original method is applied to derive astrometric data in relative positions from photometric observations of mutual occultations and eclipses of the Uranian satellites. Results. We process the 41 light-curves obtained during the international campaign of photometric observations of the Uranian satellites in 2007. The root-mean-square (rms) of the residuals "observations minus calculations" (O-C) with respect to theory for the best 34 observations are equal to 10.3 and 17.7 mas in right ascension and declination, respectively. For five observations only the position angle was derived. Topocentric or heliocentric angular differences for satellites pairs were obtained from 25 central instant offsets between observation and theory during the time period from May 4, 2007 to January 4, 2008. Conclusions. The rms of the residuals is from 10 to 20 mas that corresponds in situ to 10 to 20 km. These mutual event observations appear to be the most accurate astrometric ground-based observations of the major Uranian satellites to-date and should be used for dynamical purposes. © 2013 ESO.

AB - Context. The photometry of mutual occultations and eclipses of natural planetary satellites can be used to infer very accurate astrometric data. This can be achieved by processing the light curves of the satellites observed during international campaigns of photometric observations of these mutual events. Aims. This work focuses on processing the complete database of photometric observations of the mutual occultations and eclipses of the Uranian satellites made during the international campaign in 2007. The final goal is to derive new accurate astrometric data. Methods. We used an accurate photometric model of mutual events that explicitly depends on parameters that these accurate observations should be sensitive to, including the albedos of the satellites. Our original method is applied to derive astrometric data in relative positions from photometric observations of mutual occultations and eclipses of the Uranian satellites. Results. We process the 41 light-curves obtained during the international campaign of photometric observations of the Uranian satellites in 2007. The root-mean-square (rms) of the residuals "observations minus calculations" (O-C) with respect to theory for the best 34 observations are equal to 10.3 and 17.7 mas in right ascension and declination, respectively. For five observations only the position angle was derived. Topocentric or heliocentric angular differences for satellites pairs were obtained from 25 central instant offsets between observation and theory during the time period from May 4, 2007 to January 4, 2008. Conclusions. The rms of the residuals is from 10 to 20 mas that corresponds in situ to 10 to 20 km. These mutual event observations appear to be the most accurate astrometric ground-based observations of the major Uranian satellites to-date and should be used for dynamical purposes. © 2013 ESO.

U2 - 10.1051/0004-6361/201322039

DO - 10.1051/0004-6361/201322039

M3 - Article

JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

SN - 0004-6361

ER -