A2POINT ivo://nasa.heasarc/a2point NASA/GSFC HEASARC HEASARC 2026-04-10 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov Observation The HEAO 1 A-2 Pointing Catalog of High-Energy X-ray Sources is the result of a study of selected targets using the three detectors of the A-2 Experiment. The detectors consisted of the HED (high energy detector) in the range 3-6 KeV, the MED (medium energy detector) in the range 1.5-15 KeV, and the LED (low energy detector) in the range 0.15-3 KeV. The HEAO A-2 Experiment was primarily designed for studying the diffuse X-ray background; however, it was also capable of studying point sources to good sensitivity. Thus, after several months of continuous scanning to survey 95% of the diffuse X-ray sky, the A-2 detectors began individual pointings at selected targets. The point maneuvers began on day 319, 15 November 1977 and ended on day 739, 9 January 1979. This is a service provided by NASA HEASARC . https://heasarc.gsfc.nasa.gov/W3Browse/all/a2point.html Archive Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=a2point& GET text/xml 180 99999 true 102.392088487908 -80.1519128808941 1 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=a2point GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_a2point&Action=More+Options&Action=Parameter+Search&ConeAdd=1 HEAO1 1 X-ray public a2point HEAO 1 A2 Pointing Catalog bii Galactic Longitude degree pos.galactic.lat double nullable pp Ping Pong char nullable instrument Instrument char nullable dec Declination degree pos.eq.dec;meta.main double nullable ra Right Ascension degree pos.eq.ra;meta.main double nullable duration Duration of Pointing (sec) s time.duration;obs int nullable "__row" System index column char nullable end_time Stop time of pointing mjd time.end;obs double nullable "time" Start Time of Pointing mjd time.start;obs double nullable lii Galactic Latitude degree pos.galactic.lon double nullable "__y_ra_dec" System unit vector column double nullable "__z_ra_dec" System unit vector column double nullable name Target Name meta.id;meta.main char nullable "__x_ra_dec" System unit vector column double nullable