Kronos Facts

Mission Parameters

Launch Date

March 2007

Launch Vehicle

Delta 2925-10

Orbit

High-Earth, Lunar-Assist Open Orbit

Period: 13.7 days (1/2 lunar period)
Perigee Range: 7 - 18 RE
Apogee Range: 60 - 70 RE
Inclination Range: 25 - 70°

Science Program Duration

30 months (Baseline Mission)

Payload

Co-aligned UV/VIS and X-Ray spectrophotometers

Spacecraft

Spectrum Astro SA-200HP

Slew Rate

180° in 430 sec

Observatory Mass (Wet)

883 kg

Power Requirements

641 Watts

Observatory Pointing Accuracy

<7"

Ground Communications

Commercially through Universal Space Network, Inc.

Spacecraft Communications

Phased array (X-band)

Uplink

S-band, 10 kb/uplink

Downlink

Spacecraft: S-band, 125 bps

 

 

Science: X-band, 3500 Mbytes/day

 

UV/VIS Instrument Parameters

Aperture

70 cm

Mirror Type

Off-axis parabola

Focal Ratio

 f/4.25

Field of View

20" × 20"

Spectrograph Type

Modified Rowland

Gratings

Mild toroids

 

Far Ultraviolet

Near Ultraviolet/Visible

Bandpass

100 - 170 nm

270 - 540 nm

Spectral Resolution

0.15 nm

0.25 nm

Detector

Photon-counting electron-
bombarded CCD

Integrating CCD
 

Timing Resolution

<500 msec

 <500 msec

X-Ray Instrument Parameters

Aperture

40 cm

Mirror Type

Segmented conical foil

Mirror Coating

Gold

Focal Length

3.4 m

Bandpass

0.1 - 10 keV

Spatial Resolution (half power)

1.5'

Field of View

24' × 24'

Detector

CCD (600 × 600, 40 µm pixels)

Filters

Al (48 nm) + polyimide (180 nm) + Ni mesh

Timing Resolution

<200 msec


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Updated 29 October 2001
peterson@astronomy.ohio-state.edu