Home     Getting Started     To Survive in the Universe    
Inhabited Sky
    News@Sky     Astro Photo     The Collection     Forum     Blog New!     FAQ     Press     Login  

HD 17644


Contents

Images

Upload your image

DSS Images   Other Images


Related articles

Analysis of the flare of May 16th, 1981 with a complex space-time structure using optical, X-ray data and radio observations
A comprehensive analysis of the flare event of May 16, 1981 was carriedout using burst records, heliograms, and dynamic spectra of radioemission in the frequency band 1000-45 MHz. Observations of X-rayemission obtained from the Prognoz-8 satellite were also used in theanalysis. Attention is given to the location and dynamic characteristicsof the H-alpha knots accompanied by a complicated multicomponent timeprofile and a strongly varying spectrum of X-ray and microwave bursts. Asubstantial change in the frequency spectrum of the microwave emissionwas observed during the development of the flare, with the maximumshifting towards the short-wave part of the cm band when H-alphaemission approached the sunspots. In the pre-maximum phase of the flare,sharp changes in the rate of increase of soft X-rays were correlatedwith the brightening of existing and upsurging new knots of H-alphaemission. The radio spectra for different frequency bands are reproducedin photographic form.

Submit a new article


Related links

  • - No Links Found -
Submit a new link


Member of following groups:


Observation and Astrometry data

Constellation:とけい座
Right ascension:02h48m01.27s
Declination:-51°48'55.7"
Apparent magnitude:9.216
Proper motion RA:23.5
Proper motion Dec:12.1
B-T magnitude:9.892
V-T magnitude:9.272

Catalogs and designations:
Proper Names   (Edit)
HD 1989HD 17644
TYCHO-2 2000TYC 8057-230-1
USNO-A2.0USNO-A2 0375-00898813
HIPHIP 13075

→ Request more catalogs and designations from VizieR