Today’s CometWatch post delves behind in time to Oct final year, when Rosetta was orbiting a comet during a stretch of only 10 km.
This singular support NAVCAM picture was prisoner on 23 October, when a stretch to a centre of a comet was 9.76 km. The normal picture scale is therefore about 83 cm/pixel and a picture measures 850 m opposite (note that since of a observation geometry, forehead regions are adult to 2 km closer to a viewer, and therefore have an estimate scale of 67 cm/pixel). For reference, an picture in a identical course was prisoner on 26 November.
The stage highlights a hauntingly pleasing backlit cliffs of Hathor, a limit only throwing a object during tip left. The picture has been easily processed to improved move out a sum of this region, and also reveals a disband heat of a comet’s activity. Indeed, subtly brighter rags can be traced opposite a darker background, in sold during a right of a support during a transition from a forehead turf to Hathor in the background.
If we were station during a bottom of Hathor in a Hapi segment – out of perspective in this picture – these near-vertical cliffs would building some 900m above you. As can be seen here, Hathor is characterised by sets of linear facilities that extend for most of a tallness of a cliff. In places, lineaments and terraces also cut opposite roughly perpendicular to them. As described by Thomas et al in an OSIRIS scholarship paper progressing this year, Hathor might be an eroded aspect and as such is arrangement us a inner structure of a comet’s head.
In a foreground, resisting terrains within a Seth segment on a comet’s vast lobe are observed. While a left-hand apportionment exhibits a well-spoken surface, a right-hand apportionment shows outcrops of some-more imperishable turf and countless boulders. The unprotected surfaces also arrangement linear structures in several orientations.
The apportionment of Seth seen here is during an intersection of several regions: during the far right of a support lies a range between Seth and Anubis, while only out of perspective over a bottom of a frame are Ash and Atum.
Today’s picture is one of many that will be enclosed in the NAVCAM information recover scheduled for a finish of this month. This will see a recover of a whole collection of images taken from a 10 km circuit final year, along with images taken around a events of comet landing. You can browse all NAVCAM images released so distant in a Archive Image Browser.
The strange 1024 x 1024 pixel picture is supposing below:
Source: Rosetta blog