Corona Australis 1

Corona Australis 1 (CrA 1) is a designation for the first extrasolar astronomical X-ray source discovered in the constellation Corona Australis by the Einstein Observatory.
Corona Australis
Corona Australis (CrA) is a small constellation in the southern hemisphere of the celestial sphere. Of the eighty-eight International Astronomical Union (IAU) modern constellations, CrA is 80th in terms of area of the sky at 127.696 sq. deg. Once some 840 X-ray sources have been discovered (HEAO 1 catalog), approximately 2-3 are expected to be discovered in CrA if a uniform distribution of sources occurs.
Prior to the Einstein Observatory, launched on November 13, 1978, no X-ray sources are apparently discovered in CrA from the beginning of such discoveries on June 19, 1962, while actually searching for X-rays from the Moon, until April 6, 1980.
The image at right contains the 222 X-ray sources detected within the constellation Corona Australis.
Extrasolar X-ray source astrometry
On April 6, 1980, nine X-ray sources are discovered in image 4512, where two have cataloged identifications and three have new stellar identifications.
Currently, according to SIMBAD, CrA 1 is for the epoch 2000 at J2000.0 RA Dec .
The 4th Uhuru catalog contains no designated X-ray source from the constellation Corona Australis. However, Sagittarius X-7 is just inside the International Astronomical Union (IAU) border of Corona Australis from Sagittarius, making Sagittarius X-7 probably the first astronomical X-ray source (Corona Australis X-1) detected in Corona Australis. Sagittarius X-7 is a discovery by the satellite Uhuru probably after December 12, 1970, and before May 4, 1972.
Astronomical visual source
CrA 1 is a naked T Tauri star (NTTS), rather than a classical T Tauri star (CTTS), or weak-lined T Tauri star (WTTS).
The astronomical visual source associated with CrA 1 is the star V709 Coronae Australis (V709 CrA). V709 CrA is a variable star of the Orion type, of spectral type K1 IV, and it is distinct from HH 101 which is 87" from V709 CrA, yet has the designation HH 101 3.
Astronomical X-ray source
CrA 1 is a strong coronal cloud X-ray source.<ref name=Brown/> CrA 1 is Advanced Satellite for Cosmology and Astrophysics (ASCA) X-ray source AX 18581-3705 and Chandra X-ray Observatory (CXO) source J190134.84-370056.7.

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