References
- (http://www.unmuseum.org/halleycomet.htm)
- (http://www.astrosociety.org/edu/publications/tnl/06/06.html)
- (http://www.tenfactsabout.co.uk/0013halleyscomet.htm)
- (D. W. Hughes et al. (1987). "The History of Halley's Comet")
- (Nakano (2001). "OAA computing sectioncircular". Oriental Astronomical Association.)
- ("NEO Close-Approaches Between 1900 and 2200 (sorted by relative velocity" NASA/JPL Near-Earth Object Program).
- (A. Morbidelli (2005). "Origin and dynamical evolution of comets and their reservoirs")
- (https://astronomy.swin.edu.au/cosmos/H/Halley-type+comets).
- (http://www.geocities.com/lauferworld.geo/haleyhome.html)
- (http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=1P;orb=0;cov=0;log=0;cad=1#cad)
- (D. I. Olsson-Steel (1987). "The dynamical lifetime of comet P/Halley")
- (D. K. Yeomans, P. W. Chodas, G. Sitarski, S. Szutowicz, and M. Królikowska. "Cometary Orbit Determination and Nongravitational Forces")
- (B.V. Chirikov and V.V. Vecheslavov (1989). "Chaotic dynamics of comet Halley")
- (D. C. Jewitt (2002). "From Kuiper Belt Object to Cometary Nucleus: The Missing Ultrared Matter".)
- ("Orionids Meteor Shower Lights Up the Sky" http://phys.org/news175364339.html)
- (https://solarsystem.nasa.gov/planets/orionids.cfm)
- (G. Kronk (1999). Cometography, vol.1. Cambridge University Press. p. 14)
- (https://solarsystem.nasa.gov/planets/orionids.cfm)