Home     To Survive in the Universe    
Services
    Why to Inhabit     Top Contributors     Astro Photo     The Collection     Forum     Blog New!     FAQ     Login  
→ Adopt this star  

HD 192844


Contents

Images

Upload your image

DSS Images   Other Images


Related articles

Doppler imaging of Speedy Mic using the VLT. Fast spot evolution on a young K-dwarf star
We study the short-term evolution of starspots on the ultrafast-rotatingstar HD 197890 (“Speedy Mic” = BO Mic, K 0-2 V,Prot=0.380 d) based on two Doppler images taken about 13stellar rotations apart. Each image is based on spectra densely samplinga single stellar rotation. The images were reconstructed by our Dopplerimaging code CLDI (Clean-like Doppler imaging) from line profilesextracted by spectrum deconvolution. Our Doppler images constructed fromtwo independent wavelength ranges agree well on scales down to 10°on the stellar surface. In conjunction with nearly parallel V-bandphotometry our observations reveal a significant evolution of the spotpattern during as little as two stellar rotations. We suggest that sucha fast spot evolution demands care when constructing Doppler images ofhighly active stars based on spectral time series extending over severalstellar rotations. The fast intrinsic spot evolution on BO Mic impedesthe determination of a surface differential rotation; in agreement withearlier results by other authors we determine an upper limit of |α | < 0.004 ± 0.002.

Secondary standards for H-beta photometry in the Southern Hemisphere (second series).
Not Available

UBV (RI)c standard stars in the E- and F-regions and in the Magellanic Clouds - a revised catalogue.
Not Available

Photometric reductions and the lightcurve of (51) NEMAUSA
The light curve of the minor planet (51) Nemausa is derived on the basisof 1779 photoelectric (B and V) observations and a photometric reductionusing a rigorous least squares method. Separate light curves are givenfor the B and V observations, respectively. An absolute B-V magnitudefor (51) Nemusa of 0.787 + or - 0.004 mag was estimated. A detaileddescription of the least squares method is presented.

UBV photometry of E region standard stars of intermediate brightness
Photometry data are given for 335 stars in the nine E regions.Observations were made using a photometer and filters on the 47 cmreflector at Cape Town. The stellar dispersions are summarized. Data arepresented in tabular form.

Photometric standard stars for the UBV and (RI)KC systems.
Not Available

Fainter Standards for VRI Photometry in the E Regions
Not Available

A photoelectric UBV sequence in the region of the wing of the Small Magellanic Cloud
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1978A&AS...33..107J&db_key=AST

Carina arm studies I. Deep photoelectric UBV sequences in Vela, Carina and Crux
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1973A&AS...12..365L&db_key=AST

Standard magnitudes in the E regions.
Not Available

Submit a new article


Related links

  • - No Links Found -
Submit a new link


Member of following groups:

Observation and Astrometry data

Constellation:Sagittaire
Right ascension:20h18m56.55s
Declination:-44°31'28.0"
Apparent magnitude:7.539
Distance:216.92 parsecs
Proper motion RA:4.8
Proper motion Dec:6.5
B-T magnitude:8.766
V-T magnitude:7.641

Catalogs and designations:
Proper Names
HD 1989HD 192844
TYCHO-2 2000TYC 7960-2048-1
USNO-A2.0USNO-A2 0450-38782883
HIPHIP 100152
→ Request more catalogs and designations from VizieR