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HD 31685


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Astrophysics in 2000
It was a year in which some topics selected themselves as importantthrough the sheer numbers of papers published. These include theconnection(s) between galaxies with active central engines and galaxieswith starbursts, the transition from asymptotic giant branch stars towhite dwarfs, gamma-ray bursters, solar data from three major satellitemissions, and the cosmological parameters, including dark matter andvery large scale structure. Several sections are oriented aroundprocesses-accretion, collimation, mergers, and disruptions-shared by anumber of kinds of stars and galaxies. And, of course, there are theusual frivolities of errors, omissions, exceptions, and inventories.

Astrophysics in 1999
The year 1999 saw the arrival of a star with three planets, a universewith three parameters, and a solar corona that could be heated at leastthree ways. In addition, there were at least three papers on everyquestion that has ever been asked in astrophysics, from ``Will theUniverse expand forever?'' to ``Does mantle convection occur in one ortwo layers?'' The answers generally were, ``Yes,'' ``No,'' and ``None ofthe above,'' to each of the questions. The authors have done their bestto organize the richness around centers defined by objects, methods, andmadnesses.

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Osservazione e dati astrometrici

Costellazione:Lepre
Ascensione retta:04h56m58.04s
Declinazione:-22°02'17.1"
Magnitudine apparente:8.619
Distanza:280.899 parsec
Moto proprio RA:4
Moto proprio Dec:-4.5
B-T magnitude:10.165
V-T magnitude:8.747

Cataloghi e designazioni:
Nomi esatti
HD 1989HD 31685
TYCHO-2 2000TYC 5912-777-1
USNO-A2.0USNO-A2 0675-01793377
HIPHIP 23009

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