|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 altitude||800 km (500 mi)|
|Apogee altitude||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 2015[update], the satellite was planned for launch together with CHEOPS (Characterising Exoplanets Satellite) in 2019. However, this launch is no longer (as of 2019) considered. Some sources name 2020 or 2021 as the launch year of the satellite.
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 survey 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. In March 2015, talks to arrange a flight for Nano-JASMINE began between NAOJ and the European Space Agency. It was to be launched as a piggyback payload with CHEOPS on a Soyuz rocket in 2019. This launch is no longer (as of 2019) considered for Nano-JASMINE. As of 2019, the launch of Nano-JASMINE is foreseen in 2020 or 2021.
- "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.
- Gouda, N. (15 September 2015). 小型JASMINE計画 (PDF). GOPIRA Symposium 2015. 14–16 September 2015. Mitaka, Tokyo, Japan. (in Japanese). Group of Optical and Infrared Astronomers. Retrieved 2 April 2017.
- Yamada, Yoshiyuki (2015). Gaia validation by Nano-JASMINE data (PDF). GENIUS Mid Term Review Meeting. 20 November 2015. Leiden, the Netherlands. Retrieved 2 April 2017.
- "Exoplanet mission launch slot announced". ESA. 23 November 2018. Retrieved 30 November 2018.
- 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.
- Krebs, Gunter (28 February 2017). "Nano-JASMINE". Gunter's Space Page. 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.
- Bauer, Markus (11 July 2014). "CHEOPS exoplanet mission meets key milestones en route to 2017 launch". European Space Agency. Retrieved 1 April 2017.
- "Ready for testing electromagnetic compatibility". CHEOPS. University of Berne. 14 February 2017. Retrieved 1 April 2017.
- "Small-JASMINE | (about link)". www.jasmine-galaxy.org. Retrieved 7 August 2019.
- JASMINE project website at JASMINE-Galaxy.org
- Nano-JASMINE website by the University of Tokyo