|Names||Nano-Japan Astrometry Satellite Mission for Infrared Exploration|
|Mission type||Astrometric observatory|
|Mission duration||Planned: 2 years|
|Manufacturer||NAOJ / ISSL|
|Launch mass||35 kg (77 lb)|
|Dimensions||50.8 × 50.8 × 51.2 cm (20.0 × 20.0 × 20.2 in)|
|Perigee||800 km (500 mi)|
|Apogee||800 km (500 mi)|
|Diameter||5.25 cm (2.07 in)|
|Focal length||167 cm (66 in)|
The Nano-Japan Astrometry Satellite Mission for Infrared Exploration (Nano-JASMINE) is an astrometric microsatellite developed by the National Astronomical Observatory of Japan, with contributions by the University of Tokyo's Intelligent Space Systems Laboratory. As of 2017[update], the satellite is waiting for an available launch opportunity.
Nano-JASMINE is a microsatellite measuring 50.8 by 50.8 by 51.2 centimetres (20.0 by 20.0 by 20.2 in) and weighing approximately 35 kilograms (77 lb). It carries a small, 5.25-centimetre (2.07 in) Ritchey–Chrétien telescope that will make observations in the infrared spectrum, allowing for easier observation toward the center of the Milky Way. Its exterior is covered with GaAs solar cells providing approximately 20 watts of power. Due to limited bandwidth, Nano-JASMINE will employ a Star Image Extractor (SIE) for onboard raw image processing that will extract and transmit only specific object data.
Nano-JASMINE is Japan's first and the world's third astrometric spacecraft, following Hipparcos (1989) and Gaia (2013), both launched by the European Space Agency. It is the pathfinder in a planned series of three spacecraft of increasing size and capability; the second is Small-JASMINE with a 30-centimetre (12 in) telescope, and the third being JASMINE with an 80-centimetre (31 in) telescope.
The spacecraft is designed to have an astrometric accuracy (2-3 mas for stars less than 7.5 magnitude) comparable to Hipparcos (1 mas). Nano-JASMINE should be able to detect approximately four times the number of stars as Hipparcos. Given the time difference between these missions, combining the data sets of Nano-JASMINE and Hipparcos will constrain the positions of stars whose current positions are poorly known owing to uncertainty in their motion since being measured by Hipparcos, and should provide an order-of-magnitude increase in the accuracy of proper motion measurements (approximately 0.1 mas/year; 0.2 mas/year for stars less than 9 magnitude).
Nano-JASMINE had been scheduled for launch aboard a Tsyklon-4 rocket from the Brazilian Space Agency's Alcântara Launch Center. The launch was originally contracted for August 2011, but was delayed to the November 2013 to March 2014 time frame. Various issues have held back its launch, first due to delays in both the construction of the launch site and development of the launch vehicle, and later due to Brazil backing out of the Tsyklon-4 partnership with Ukraine leading to the rocket's indefinite hold. It is unknown what launch vehicle Nano-JASMINE may launch on or when it will take place.
- "Nano-JASMINE". eoPortal. European Space Agency. Retrieved 29 March 2017.
- Yamada, Yoshiyuki; Fujita, Sho; Gouda, Naoteru; et al. (February 2013). "Scientific goals of Nano-JASMINE". Advancing the Physics of Cosmic Distances, Proceedings of the International Astronomical Union. 289: 429–432. Bibcode:2013IAUS..289..429Y. doi:10.1017/S1743921312021886.
- Krebs, Gunter (28 February 2017). "Nano-JASMINE". Gunter's Space Page. Retrieved 29 March 2017.
- Yamauchi, M.; Gouda, N.; Kobayashi, Y.; et al. (July 2008). "A Star Image Extractor for the Nano-JASMINE satellite". A Giant Step: from Milli- to Micro-arcsecond Astrometry, Proceedings of the International Astronomical Union. 248: 294–295. Bibcode:2008IAUS..248..294Y. doi:10.1017/S1743921308019388.
- Gouda, N.; et al. (29 August 2012). Present status of JASMINE projects (PDF). 28th International Astronomical Union General Assembly. 20-31 August 2012. Beijing, China.
- "Nano-JASMINE Launch Contract". University of Tokyo. 26 February 2010. Retrieved 29 March 2017.
- de Selding, Peter B. (16 April 2015). "Brazil Pulling Out of Ukrainian Cyclone-4 Launcher Project". Space News. Retrieved 9 April 2016.