TY - JOUR
T1 - Photoelectric discovery of a 52-Hr periodicity in the nuclear activity of P/Halley
AU - Leibowitz, Elia M.
AU - Brosch, Noah
N1 - Funding Information:
This work is partiallys upportebdy a grantf romthe Adler Foundationfo r Space ResearchA. stronomical observationast the Wise Observatorayr e supported by the Basic ResearchB rancho f the Israeli Academy of Sciencesa ndby the Ministryo f Sciencea ndDevel-opmentW. e thank Mr. Ezra Mashal for his valuable assistancien securingth eo bservationWs. e are grateful to Dr. M. F. A'Hearn for providingth e Wise Ob-servatoryw ith the set of filtersu sedin this work. We acknowledgues eof reductionp rogramws rittenb y Dr. T. Mazeh.
PY - 1986/12
Y1 - 1986/12
N2 - Intermediate band photemetric observations of P/Halley performed in November and December 1985 at the Wise Observatory reveal a cycle of 52 hr in the lightcurve emitted from the near-nucleus zone. Significant periodic variations have been found in the color index M(5140)-M(7000), i.e., the magnitude difference between measurements through two bandpass filters centered around emission lines of C2 and of H2O+, respectively. There is no apparent cyclic variation in either the blue or the red continuum radiation from the same region. The periodic line variation is interpreted by us as the modulation of the molecular density of the two species in the inner coma caused by variation in mass ejection from the spinning nucleus of the comet.
AB - Intermediate band photemetric observations of P/Halley performed in November and December 1985 at the Wise Observatory reveal a cycle of 52 hr in the lightcurve emitted from the near-nucleus zone. Significant periodic variations have been found in the color index M(5140)-M(7000), i.e., the magnitude difference between measurements through two bandpass filters centered around emission lines of C2 and of H2O+, respectively. There is no apparent cyclic variation in either the blue or the red continuum radiation from the same region. The periodic line variation is interpreted by us as the modulation of the molecular density of the two species in the inner coma caused by variation in mass ejection from the spinning nucleus of the comet.
UR - http://www.scopus.com/inward/record.url?scp=17044392809&partnerID=8YFLogxK
U2 - 10.1016/0019-1035(86)90048-5
DO - 10.1016/0019-1035(86)90048-5
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AN - SCOPUS:17044392809
SN - 0019-1035
VL - 68
SP - 418
EP - 429
JO - Icarus
JF - Icarus
IS - 3
ER -