To Survive in the Universe    
Services
    Why to Adopt     Top Contributors     천체사진     컬렉션     포럼     Blog New!     질문및답변     로그인  
→ Adopt this star  

HD 153993


내용

사진

사진 업로드

DSS Images   Other Images


관련 글

New periodic variables from the Hipparcos epoch photometry
Two selection statistics are used to extract new candidate periodicvariables from the epoch photometry of the Hipparcos catalogue. Theprimary selection criterion is a signal-to-noise ratio. The dependenceof this statistic on the number of observations is calibrated usingabout 30000 randomly permuted Hipparcos data sets. A significance levelof 0.1 per cent is used to extract a first batch of candidate variables.The second criterion requires that the optimal frequency be unaffectedif the data are de-trended by low-order polynomials. We find 2675 newcandidate periodic variables, of which the majority (2082) are from theHipparcos`unsolved' variables. Potential problems with theinterpretation of the data (e.g. aliasing) are discussed.

Radial velocities. Measurements of 2800 B2-F5 stars for HIPPARCOS
Radial velocities have been determined for a sample of 2930 B2-F5 stars,95% observed by the Hipparcos satellite in the north hemisphere and 80%without reliable radial velocity up to now. Observations were obtainedat the Observatoire de Haute Provence with a dispersion of 80Ä,mm(-1) with the aim of studying stellar and galactic dynamics.Radial velocities have been measured by correlation with templates ofthe same spectral class. The mean obtained precision is 3.0 km s(-1)with three observations. A new MK spectral classification is estimatedfor all stars. Based on observations made at the Haute ProvenceObservatory, France and on data from The Hipparcos Catalogue, ESA.Tables 4, 5 and 6 are only available in electronic form at the CDS viaanonymous ftp to cdsarc.u-strasbg.fr or viahttp://cdsweb.u-strasbg.fr/Abstract.htm

새 글 등록


관련 링크

  • - 링크가 없습니다. -
새 링크 등록


다음 그룹에 속해있음:


관측 및 측정 데이터

별자리:헤르쿨레스자리
적경:17h02m01.39s
적위:+19°03'29.2"
가시등급:8.424
거리:252.525 파섹
적경상의 고유운동:-4.8
적위상의 고유운동:-4.1
B-T magnitude:8.577
V-T magnitude:8.437

천체목록:
일반명
HD 1989HD 153993
TYCHO-2 2000TYC 1530-23-1
USNO-A2.0USNO-A2 1050-08305905
HIPHIP 83345

→ VizieR에서 더 많은 목록을 가져옵니다.