Attitude reconstruction of ROSETTA׳s Lander PHILAE using two-point magnetic field observations by ROMAP and RPC-MAG

Heinisch, Philip; Auster, H. U.; Richter, Ingo; Herčík, David; Jurado, Eric; Garmier, Romain; Güttler, C.; Glaßmeier, Karl‐Heinz

doi:10.1016/j.actaastro.2015.12.002

Cited by 20 publications

(14 citation statements)

References 15 publications

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“…Although the position of Philae on the comet was constrained rather well, using images taken with the cameras aboard the Orbiter as well as CONSERT ranging data [3,20,24] and its orientation was determined using ROMAP measurements [25], the uncertainties regarding the surrounding terrain, illumination during seasonal changes and thermal input from the comet environment were rather high. Consequently, it was impossible to give exact predictions on when the Lander would have sufficient power to boot and when radio contact could be possible again.…”

Section: Lander Wake Up and Attempted Ltsmentioning

confidence: 99%

Rosetta Lander – Landing and operations on comet 67P/Churyumov–Gerasimenko

Ulamec¹,

Fantinati²,

Maibaum³

et al. 2016

Acta Astronautica

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Section: Lander Wake Up and Attempted Ltsmentioning

confidence: 99%

Rosetta Lander – Landing and operations on comet 67P/Churyumov–Gerasimenko

Ulamec¹,

Fantinati²,

Maibaum³

et al. 2016

Acta Astronautica

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“…After second touchdown, Philae had lost most of the rotational energy, spinning only with about f 3 = (2.0 ± 0.5) mHz. The flight times, the rotation rates, contact times, contact geometry, and lander attitude used in the following sections were all taken from Heinisch et al (2016Heinisch et al ( , 2017a.…”

Section: Trajectory and Attitude Reconstructionmentioning

confidence: 99%

“…In the following section, the locations of the individual touchdowns are discussed and used to derive the required velocities based on assumed ballistic flight parabolas, taking into account previous reconstructions by Auster et al (2015), Biele et al (2015), and Heinisch et al (2017a). In a next step, attitude information gained from twopoint magnetic field observations by the ROMAP (Auster et al 2007) and RPC-MAG (Glassmeier et al 2007b) magnetometers based on the work of Heinisch et al (2016Heinisch et al ( , 2017a and Richter et al (2016) is used in conjunction with a digital terrain model of 67P (Preusker et al 2017) to determine the geometry of the contacts. This is necessary to calculate the contact pressure (force per contact area).…”

Section: Introductionmentioning

confidence: 99%

Compressive strength of comet 67P/Churyumov-Gerasimenko derived from Philae surface contacts

Heinisch

Auster

Gundlach

et al. 2019

A&A

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Context. The landing and rebound of the Philae lander, which was part of the ESA Rosetta mission, enabled us to study the mechanical properties of the surface of comet 67P/Churyumov-Gerasimenko, because we could use Philae as an impact probe. Aims. The aim is to approximate the descent and rebound trajectory of the Philae lander and use this information to derive the compressive strength of the surface material from the different surface contacts and scratches created during the final touchdown. Combined with laboratory measurements, this can give an insight into what comets are made of and how they formed. Methods. We combined observations from the ROMAP magnetometer on board Philae with observations made by the Rosetta spacecraft, particularly by the OSIRIS camera system and the RPC-MAG magnetometer. Additionally, ballistic trajectory and collision modeling was performed. These results are placed in context using laboratory measurements of the compressibility of different materials.Results. It was possible to reconstruct possible trajectories of Philae and determine that a pressure of ∼100 Pa is enough to compress the surface material up to a depth of ∼20 cm. Considering all errors, the derived compressive strength shows little dependence on location, with an overall upper limit for the surface compressive strength of ∼800 Pa.

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“…During the descent and rebound, they are the main cause of the variations in the magnetic field, which means that analyzing these waves is a prerequisite when the magnetic observations are to be used to gain insight into the magnetization of the nucleus. The magnetic field measurements also revealed that no magnetic boundary layer exists above the cometary surface, which makes it possible to use the observations of the two RPC-MAG magnetometers in orbit as direct reference for the surface measurements (Heinisch et al 2016(Heinisch et al , 2017b. Using these results, we revisit the magnetization of comet 67P.…”

Section: Introductionmentioning

confidence: 87%

Revisiting the magnetization of comet 67P/Churyumov-Gerasimenko

Heinisch

Auster

Richter

et al. 2019

A&A

Self Cite

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Context. The landing of the Philae probe as part of the ESA Rosetta mission made it possible to study the magnetization of comet 67P/Churyumov-Gerasimenko (67P) by combining observations from the lander and orbiter. In this work, we revisit the magnetic properties with information gained during the progression of the mission for a comprehensive understanding of the circumstances of Philae's descent and landing. Aims. The aim is to derive a limit for any possible magnetization of the cometary material on the surface of 67P. To achieve this, the surface contacts of Philae were analyzed. Combined with a more detailed understanding of the background magnetic field, this allows us to interpret the underlying magnetic measurements in detail. Methods. We combined magnetic field observations from the ROMAP magnetometer on board Philae with observations from the RPC-MAG instrument on board the Rosetta orbiter. To facilitate this, a correlation analysis was used to correct phase shifts between the observed signals. Additionally, in-flight calibration of the ROMAP offsets was performed using information about the dynamics of Philae during flight. These corrections made it possible to use the orbiter measurements as reference for the comet-based Philae observations. We assumed a simple dipole model and used the magnetic field observations to derive an upper limit for the magnetization of the cometary material.Results. An upper limit of 0.9 nT for the observed magnetic field on the surface of 67P was derived for any contribution from surface magnetization. For homogeneously magnetized pebbles with a size of typical aggregates in the range of ∼5 cm, this translates into an upper limit of ∼5 × 10 −5 Am 2 kg −1 for the specific magnetic moment. Depending on the exact history of formation, this results in an upper limit of 4 µT for the magnitude of the magnetic field in the solar nebula during the formation of comet 67P.

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Attitude reconstruction of ROSETTA׳s Lander PHILAE using two-point magnetic field observations by ROMAP and RPC-MAG

Cited by 20 publications

References 15 publications

Rosetta Lander – Landing and operations on comet 67P/Churyumov–Gerasimenko

Rosetta Lander – Landing and operations on comet 67P/Churyumov–Gerasimenko

Compressive strength of comet 67P/Churyumov-Gerasimenko derived from Philae surface contacts

Revisiting the magnetization of comet 67P/Churyumov-Gerasimenko

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