Tianhui 1B

{{Short description|Chinese Earth observation satellite}}

{{Infobox spaceflight

| name = Tianhui I-02

| image = Tianhui 1B.jpg

| image_caption = Tianhui I-02

| mission_type = Earth observation

| operator = CASC

| COSPAR_ID = 2012-020A

| SATCAT = 38256

| mission_duration =

| spacecraft_bus =

| manufacturer =

| dry_mass =

| launch_mass =

| power =

| launch_date = {{start-date|6 May 2012, 07:10:05|timezone=yes}} UTC

| launch_rocket = Chang Zheng 2D

| launch_site = Jiuquan LA-4/SLS-2

| launch_contractor =

| disposal_type =

| deactivated =

| decay_date =

| orbit_epoch = 6 May 2012{{cite web |url=http://planet4589.org/space/log/satcat.txt |title=Satellite Catalog |publisher=Jonathan's Space Page |first=Jonathan |last=McDowell |access-date=3 May 2018}}

| orbit_reference = Geocentric

| orbit_regime = Low Earth

| orbit_periapsis = {{convert|492|km}}{{cite web|url=http://space.skyrocket.de/doc_sdat/th-1.htm|title=TH 1|work=Gunters Space Page|access-date=8 March 2013}}{{cite web|title=TianHui 1B|url=http://www.spacenewsfeed.co.uk/index.php/launches/11575-tianhui-1b|work=Space New Feed|publisher=Space News Feed}}

| orbit_apoapsis = {{convert|504|km}}

| orbit_inclination = 97.35 degrees

| orbit_period = 94.57 minutes

| apsis = gee

}}

Tian Hui-1 (also known as Mapping Satellite I) is a Chinese Earth observation satellite built by Dong Feng Hong, a China Aerospace Science and Technology Corporation (CASC).

Tian Hui-1 was launched on 6 May 2012 at 9:10 UTC on a Long March 2D rocket into a Sun-synchronous, polar orbit with an perigee of {{convert|490|km|abbr=on}} and apogee of {{convert|505|km|abbr=on}}.{{cite web|title=Chinese Mapping Satellite Successfully Launched to Orbit|date=8 May 2012 |url=http://www.space.com/15588-china-mapping-satellite-launch.html|publisher=Space.com|access-date=8 March 2013}}

According to the Chinese Ministry of Defense the new satellite carries scientific experiments and is to be used for the evaluation of ground resources and mapping.{{cite web|title=China launches Tianhui-1B via Long March 2D|date=6 May 2012 |url=http://www.nasaspaceflight.com/2012/05/china-launches-tianhui-1b-long-march-2d/|publisher=NASA spaceflight|access-date=8 March 2013}}

Tian Hui 1 is equipped with two different camera systems in the visible and infrared range. The visible light camera is able to produce three-dimensional pictures in the spectral region between 510 and 690 nanometers with a dissolution of approximately 5 meters and a field of view of approximately 25 degrees. The infrared camera reaches a dissolution of approximately 10 meters and covers four wavelengths (430 - 520 Nm, 520 - 610 Nm, 610 - 690 Nm and 760 - 900 Nm).