Immagini scattate il 12-14 maggio:
Situazione attuale:- 10.000 km alla meta (asteroide Ryugu)
- velocitą di avvicinamento 70 km/h
- Distanza dalla Terra: 285.007.527 km
- Ritardo comunicazioni: 800+800 secondi
- Km totali percorsi dal 2014: 3.127.584.009
Tabella di marcia:- Primi di giugno - Termine operazioni motore a ioni
- Primi di giugno - Inizio avvicinamento fino a 2500 km
- 21 giugno- 5 luglio - Inserimento in orbita di 20 km
- Fine luglio: Osservazioni di Ryugu a quota media (5 km)
- Agosto: Discesa per misure di gravitą (fino a 1 km)
- Settembre - Ottobre: Periodo utile per primo contatto (touchdown) e tentativo di raccolta campioni.
- Settembre - Ottrobre: Periodo utile per rilascio dei rover (3 /ander/rover Minerva-II e 1 lander/rover Mascot)
Dati delle
telecamere di Hayabusa 2 da documento del 2013:
Quote:
Optical Navigator Cameras
(ONC) will be used for scientific imaging observations
as well as for the Hayabusa-2 spacecraft navigation in
the proximity of asteroid 1999 JU3. The ONC system
consists of the three subsystems, a telescopic camera
(ONC-T) and wide-angle cameras (ONC-W1 and -W2).
Each subsystem has a two-dimensional (1024×1024)
charge-coupled device (CCD) sensitive to wavelengths
between 350 and 1060 nm. Both ONC-T and W1 are
installed on the bottom of spacecraft (i.e., –Z panel) for
nadir view, and ONC-W2 is on the side of spacecraft
(–X panel) for slant view (Fig. 1). The effective field
of view (FOV) of ONC-T is 5.7 × 5.7 deg, and that of
ONC-W1 and W2 are 60 × 60 deg. The spatial resolution
at 1 km altitude is 0.1 m/pixel for ONC-T and 1.0
m/pixel for ONC-W1 and W2, respectively. ONC-T
has a broad band-pass filter (0.35 – 1.2 µm), six medium-breadth
filters (0.39±20, 0.48±15, 0.55±15, 0.70±15,
0.86±20, and 0.95±30; suffixes indicate the respective
band widths)), and a narrow band Na filter at 0.59 µm
with 10 nm of FWHM.
|
https://www.lpi.usra.edu/meetings/lpsc2013/pdf/3026.pdf
Dati tecnici/ottici
Telecamera di uno dei vari lander, il MASCOT (sviluppato da agenzia spaziale tedesca DLR e francese CNES), che rimbalzerą sulla superficie un paio di volte:
Quote:
The MASCOT camera, a highly compact CMOS
camera, is designed to cover a large part of the surface
in front of MASCOT. It is mounted inside the lander
slightly tilted, such that the center of its 55° square
field-of-view is aimed at the surface at an angle of 22°
with respect to the surface plane. This means that both
the surface close to the lander and the horizon are in
the FOV, when the lander rests on a horizontal surface.
The camera is designed according to the Scheimpflug
principle, which ensures that the entire scene along the
camera’s depth of field (150 mm to infinity) is in
focus. The camera is equipped with a 1024x1024 pixel
CMOS sensor sensitive in the 400-1000 nm
|
https://ssed.gsfc.nasa.gov/IPM/PDF/1051.pdf
Quote:
MasCam will operate as descent and in-situ imager (both during day and night phases).
During descent, imaging will start shortly after the separation from the Hayabusa 2 mother
spacecraft. Descent images will be acquired until touchdown of MASCOT. The images will
close the resolution gap between orbital and surface imaging and allow to identify the landing
site within the orbiter camera dataset. After touchdown, the camera will acquire wideangle
images of the asteroid’s surface. From these images, surface features will be mapped
on scales ranging from meters down to a sub-millimeter to characterize the surface in terms
of regolith physical properties, texture, morphology, particle size distribution, and microcraters
|
http://elib.dlr.de/107135/1/MASCOT-CAM_SSR.pdf
Ci sono poi anche 3 piccoli rover "Minerva", anch'essi destinati a fare qualche rimbalzo sulla superficie..
E poi c'č la
DCAM-3 che dovrebbe riprendere l'impatto di un proiettile-sonda sulla superficie:
Quote:
The DCAM3-D CMOS sensor produces 2000 x
2000 pixels 8 bit monochromatic images with a 74 x
74 degrees wide-angle optics. It takes 1 frame/sec
sequential images at maximum.
|
Feed twitter:
Hayabusa 2
In giapponese
https://twitter.com/haya2kun
Lander MASCOT[/quote]
Animazione della missione (ma manca l'espulsione delle due capsule cilindriche che contengono i 3 rover Minerva):
https://www.youtube.com/watch?v=8H4aZX_8hMA
La "X" indica il punto in cui verranno spenti il motore principale per iniziare la manovra di "accosto":
https://aliveuniverse.today/rubriche...roccio-a-ryugu