Astrometric observations of Phobos with the SRC on Mars Express - New data and comparison of different measurement techniques

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Table 8

Differences between ROB MarsSatV1_0 and JPL MAR085 orbit models.

	ROB MarsSatV1_0¹	JPL MAR085²


Martian gravity field	MGM1041C up to degree 10	MGS95J up to degree 8 in zonal and degree and order 5 in tesseral harmonics


Mars orientation model	IAU 2000 model	Orientation model with nutation (Konopliv et al. 2006)


Solar system ephemerides	DE406	DE421


Phobos and Deimos mass	Adopted from literature	Estimated from S/C tracking data


Tidal interactions	Phobos and Deimos tides on Mars	Phobos tides on Mars


Phobos gravity field	C20 and C22 coefficients included and estimated	C20 and C22 coefficients included


Phobos libration in longitude	Not yet included	Included and Phobos forced libration angle estimated


Earth-based observations	Observations through 2003	Plus observations from TMO^a and LNA/MCT^b


S/C-based observations	Observations through 2005^c	Plus observations from MRO and MEX^d

Notes.

^(a)

Table Mountain Observatory.

^(b)

Laboratório Nacional de Astrofísica do Ministério da Ciência e Tecnologia.

^(c)

Including Oberst et al. (2006).

^(d)

Including Willner et al. (2008).

Reference. (1) Lainey et al. (2007); (2) Jacobson (2010).

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