ULTRASAT (Ultraviolet Transient Astronomy Satellite) is a space telescope in a smallsat format that will detect and monitor transient astronomical events in the near-ultraviolet (220–280 nm) spectral region. ULTRASAT will observe a large patch of sky with a 210 square degrees field of view, alternating every six months between the southern and northern hemisphere. The satellite is planned to be launched into a geosynchronous orbit in late 2027. All ULTRASAT data will be transmitted to the ground in real time. Upon detection of a transient event, ULTRASAT will provide alerts within 20 minu
ULTRASAT (Ultraviolet Transient Astronomy Satellite) is a space telescope in a smallsat format that will detect and monitor transient astronomical events in the near-ultraviolet (220–280 nm) spectral region. ULTRASAT will observe a large patch of sky with a 210 square degrees field of view, alternating every six months between the southern and northern hemisphere. The satellite is planned to be launched into a geosynchronous orbit in late 2027. All ULTRASAT data will be transmitted to the ground in real time. Upon detection of a transient event, ULTRASAT will provide alerts within 20 minutes to other ground-based and space telescopes to be directed to the source for further observation of the event in other wavelength bands.
ULTRASAT's main objective is to study the hot transient universe. The extragalactic volume accessible to ULTRASAT for the discovery of transient sources will be 300 times larger than that of the most sensitive UV satellite to date, GALEX. It is comparable to that of the largest ground-based optical transient survey telescope planned to begin operation in 2025, the Vera C. Rubin Observatory.
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