Table 2
Mean (ν) and standard deviation (σ) on right ascension and declination for each satellite.
| Observations | ναcos δ | σαcos δ | νδ | σδ | N | Satellite |
|---|---|---|---|---|---|---|
| (km) | (km) | (km) | (km) | |||
| Mariner 9 (Duxbury & Callahan 1989) | −7.2594 | 7.3718 | −6.2897 | 8.1181 | 48, 48 | Phobos |
| −0.7282 | 4.1653 | −3.4240 | 4.3704 | 14, 14 | Deimos | |
| Viking 1 (Duxbury & Callahan 1988) | −0.4629 | 9.8178 | −0.1971 | 8.7993 | 132, 132 | Phobos |
| 0.7174 | 3.4617 | −1.9736 | 4.9500 | 19, 19 | Deimos | |
| Viking 2 (Duxbury & Callahan 1988) | 2.6933 | 7.7604 | −5.1783 | 8.0789 | 32, 32 | Phobos |
| −1.4065 | 3.3602 | −0.7202 | 11.9342 | 80, 80 | Deimos | |
| Phobos 2 (Kolyuka et al. 1991) | −0.3396 | 0.8558 | −0.2277 | 0.5194 | 37, 37 | Phobos |
| 3.9608 | 15.3037 | 12.0239 | 11.2175 | 8, 8 | Deimos | |
| MEX ((Willner et al. 2008); priv. comm.) | −0.0867 | 0.4485 | 0.0548 | 0.4973 | 135, 135 | Phobos |
| 0.0000 | 0.0000 | 0.0000 | 0.0000 | 0, 0 | Deimos | |
| MEX (Pasewaldt et al. 2012) | 0.0000 | 0.0000 | 0.0000 | 0.0000 | 0, 0 | Phobos |
| 0.0395 | 1.1084 | −0.3801 | 1.0322 | 136, 136 | Deimos | |
| MEX (CP) (Pasewaldt et al. 2015) | −0.3113 | 0.5400 | 0.0383 | 0.9030 | 130, 130 | Phobos |
| 0.0000 | 0.0000 | 0.0000 | 0.0000 | 0, 0 | Deimos | |
| MEX (LF) (Pasewaldt et al. 2015) | −0.1153 | 0.4126 | 0.2043 | 0.9995 | 27, 27 | Phobos |
| 0.0000 | 0.0000 | 0.0000 | 0.0000 | 0, 0 | Deimos | |
| MEX-flyby-linear-outlier (Pasewaldt et al., in prep.) | −0.3070 | 0.0529 | 0.4736 | 0.0411 | 3, 3 | Phobos |
| 0.0000 | 0.0000 | 0.0000 | 0.0000 | 0, 0 | Deimos | |
| MEX-flyby-linear (Pasewaldt et al., in prep.) | −0.0872 | 0.2683 | 0.0488 | 0.3004 | 64, 64 | Phobos |
| 0.0000 | 0.0000 | 0.0000 | 0.0000 | 0, 0 | Deimos | |
| MEX-flyby-nonlinear (Pasewaldt et al., in prep.) | 0.2143 | 0.4333 | 0.1653 | 0.3507 | 22, 22 | Phobos |
| 0.0000 | 0.0000 | 0.0000 | 0.0000 | 0, 0 | Deimos | |
| MEX-flyby-nonlinear-outlier (Pasewaldt et al., in prep.) | −0.0224 | 0.2974 | 0.2931 | 0.1644 | 8, 8 | Phobos |
| 0.0000 | 0.0000 | 0.0000 | 0.0000 | 0, 0 | Deimos | |
| MEX-flyby-shortlimb (Pasewaldt et al., in prep.) | −0.4813 | 0.2241 | 0.3064 | 0.4526 | 6, 6 | Phobos |
| 0.0000 | 0.0000 | 0.0000 | 0.0000 | 0, 0 | Deimos | |
| MEX-flyby-outlier (Pasewaldt et al., in prep.) | −0.8951 | 0.0746 | −0.5160 | 0.1332 | 3, 3 | Phobos |
| 0.0000 | 0.0000 | 0.0000 | 0.0000 | 0, 0 | Deimos | |
| MEX-Dei-Saturn-Ziese | 0.0000 | 0.0000 | 0.0000 | 0.0000 | 0, 0 | Phobos |
| −0.2029 | 0.1710 | −0.2820 | 0.0931 | 64, 64 | Deimos | |
| MEX-Pho-Saturn-Ziese | 0.1904 | 0.2440 | 0.1121 | 0.1287 | 295, 295 | Phobos |
| 0.0000 | 0.0000 | 0.0000 | 0.0000 | 0, 0 | Deimos | |
| MEX-Dei-Jup-Ziese | 0.0000 | 0.0000 | 0.0000 | 0.0000 | 0, 0 | Phobos |
| −1.0983 | 0.0782 | 0.8743 | 0.0184 | 14, 14 | Deimos | |
| MEX-Pho-Jup-Ziese | 0.2920 | 0.0269 | −0.0773 | 0.0319 | 50, 50 | Phobos |
| 0.0000 | 0.0000 | 0.0000 | 0.0000 | 0, 0 | Deimos | |
Notes. Both angles are multiplied by the distance spacecraft-moon to obtain kilometers. N is the number of observations by a satellite. Pasewaldt et al. (2015) determined the positions of Phobos using control point (CP) and/or limb point (LF) measurements. The former are based on the satellite control network, a set of identifiable surface features that are evenly distributed over the body’s surface and define its reference system. Recent MEX SRC measurements are separated into observations made during linear and nonlinear pointing variations. If the observation prefit residuals deviated by more than 3σ from the mean value, they were additionally categorized as an outlier. For only a few outliers we were unable to clarify whether they were related to nonlinear variations in pointing. Some measurements are based on fits of the shape-model-derived limb to only very short limb-point arcs in the image (see also Sect. 3.2.1).
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