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HD 224493


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The Second Extreme-Ultraviolet Explorer Source Catalog
We present the second catalog of extreme-ultraviolet objects detected bythe Extreme-Ultraviolet Explorer. The data include (1) all-sky surveydetections from the initial 6 month scanner-survey phase, (2) additionalscanner detections made subsequently during specially programmedobservations designed to fill in low-exposure sky areas of the initialsurvey, (3) sources detected with deep-survey-telescope observationsalong the ecliptic, (4) objects detected by the scanner telescopesduring targeted spectroscopy observations, and ( 3) other observations.We adopt an innovative source detection method that separates the usuallikelihood function into two parts: an intensity diagnostic and aprofile diagnostic. These diagnostics allow each candidate detection tobe tested separately for both signal-to-noise ratio and conformance withthe known instrumental point-spread function. We discuss the dependenceof the false-alarm rate and the survey's completeness on the survey'ssensitivity threshold. We provide three lists of the EUV sourcesdetected: the all-sky survey detections, the deep-survey detections, andsources detected during other phases of the mission. Each list givespositions and intensities in each wave band. The total number of objectslisted is 734. For approximately 65% of these we also provide plausibleoptical, UV, radio, and/or X-ray identifications.

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Dades d'Observació i Astrometria

Constel·lació:Pegasus
Ascensió Recta:23h58m23.36s
Declinació:+28°50'19.0"
Magnitud Aparent:8.093
Distancia:363.636 parsecs
Moviment propi RA:-1.4
Moviment propi Dec:-21.5
B-T magnitude:8.281
V-T magnitude:8.109

Catàlegs i designacions:
Noms Propis   (Edit)
HD 1989HD 224493
TYCHO-2 2000TYC 2258-1198-1
USNO-A2.0USNO-A2 1125-20013527
HIPHIP 118184

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