A'Hearn. M. F. et al Icarus 118, 223-270, 1995
"The Ensemble Properties of Comets: Results from Narrowband Photometry
of 85 Comets, 1976-1992"
Data for a complete apparition
log Q(CN)/Q(OH) = -2.62
log Q(C2)/Q(OH) = -2.37
log Q(C3)/Q(OH) = -4.26
log Q(NH)/Q(OH) = -2.27
log Q(OH) max = 27.47 at 1.41au ==> log Q(H2O) = 27.9 max at perihelion
based on derived active area
=====
Campins, H. and Schleicher, D. G. 27th DPS Abstracts, p. 59, 1995
"Comet d'Arrest: A Small and Rapidly Rotating Nucleus?"
Observations obtained with IRTF on 2-5 August 1995
Nucleus is non-spherical
Mean radius = 3.5 +/- 0.15km (assuming an isothermal latitude model)
Mean radius = 2.3 +/- 0.10km (assuming a standard thermal model)
Lightcurve amplitude is 25%
Period less than 5 hours [Note: D. Schleicher says ~3 hours with 1 day
precession]
=====
Osip, D. J. et al Icarus 98, 115-124, 1992
"Comets: Groundbased Observations of Spacecraft Mission Candidates"
Photometry of d'Arrest in 1976, 1982 with individual
observations on many dates. Produced Q(OH) and Afrho normalized to 1.5au.
Q(OH) = 9.8E27
Afrho = 100
Then produced production rate ratios:
Q(OH)/Q(CN) = 575 +/- 310
Q(CN)/Q(C2) = 0.79 +/- 0.2
Q(CN)/Q(C3) = 30.35 +/- 25.9
Q(CN)/Q(NH) = 0.45 +/- 0.13
=====
Festou et al 1992, ACM91 pp 177-182
"The Gas Production Rate of Periodic Comet d'Arrest"
Gives IUE OH measures and ground-based C2 and CN from 1982 apparition.
Lightcurve: brightness maxima occur 40 +/- 20 days after perihelion and
has not changed much since discovery
Q(H2O)= 1.2-3.0e28 mol/sec (factor of 10 below above Copernicus data)
Afrho = 190 cm (1/10 Halley) --> dust does not contribute much to the coma
conclude that much of the surface may be active (half of nucleus?)
but may have a strong seasonal effect
=====
Carusi, A. et al 1991 A&A 252, 377-384
"Observations of Periodic Comet d'Arrest in 1678 and Implications for its
Evolutionary History"
Argues a linkage of comet d'Arrest with comet La Hire in 1678.
d'Arrest "does not exhibit any secular fading but has the most pronounced
recurrent asymmetry of the light curve among all short-period comets."
steep increase 3-4 weeks post-perihelion, followed by an almost constant
brightness level persisting over one to two months.
Almost no change in absolute magnitude over three centuries
Argues that the main active area is situated near one of the rotation poles.
=====
Cochran, A. L. 1987 AJ 92, 231-238
"Another Look at Abundance Correlations Among Comets"
1AU production rates
14 Oct 1982 R=1.34
log Q(CN) = 25.02
log Q(C3) = 24.40
log Q(C2) = 25.24
=====
Festou, M. C. et al ApJ 265, 925-932, 1983
"Lyman-Alpha Observations of Comets West 1976 VI and P/d'Arrest 1976 XI
with Copernicus"
Observations of d'Arrest were obtained on 19 Sep and 3 Oct 1976 when
d'Arrest was at R=1.27 and 1.34au and delta=0.31 and 0.43au.
The doppler shift was not sufficient to separate the cometary and
geocoronal Ly alpha lines so they were modeled. Values
for the cometary Ly alpha brightness of 1.2 and 3.4 kR were derived.
Hydrogen production rates (scaled to 1au) of 0.8e29 and 3.3e29 were
derived (within a factor of 2 or 3 of west).
[editorial comment: these results seem implausible with the production
rate so high. Inconsistent with the CN production rate using normal
ratios. Suspect the geocoronal was improperly modeled]
=====
A'Hearn, M. F. et al AJ 84, 570-579, 1979
"Gas and Dust in Some Recent Periodic Comets"
(Perihelion on 12 Aug 1976)
Date R delta log Q(CN) log Q(C2) diaphram (arcsec)
12 Aug 76 1.164 0.151 25.12 25.60 109/78
13 Aug 76 1.164 0.151 25.10 25.49 78
14 Aug 76 1.164 0.152 25.14 25.47 78
19 Aug 76 1.167 0.158 25.23 25.63 78
31 Aug 76 1.189 0.204 25.26 25.66 155
14 Sep 76 1.238 0.285 25.49 25.97 155
20 Oct 76 1.447 0.566 25.38 25.83 155
=====
Fay, T. D. and Wisniewski, W. Icarus 34, 1-9, 1978
"The Light Curve of the Nucleus of Comet d'Arrest"
Obtained photometry on 4,5, and 6 August 1976, just prior to perihelion.
First two nights in a V filter and last night in a continuum only filter.
Also obtained colors.
Derive a period of 5.17 +/- 0.01 hr (sort of double peaked) which
is the same on all 3 nights. Agreement good.
Color never changes.
Aperture = 16 arcsec = 1000km so includes some coma.
Amplitude 0.15 +/- 0.02 mag.
=====
Webber, J. C. and Snyder, L. E. ApJ 214, L45-L46, 1977
"Detection of Radio OH in Periodic Comet d'Arrest"
The first detection of radio OH in a short-period comet.
Found the 1665MHz feature in emission and the 1667MHz feature in absorption
but argue they are real anyway.
Derive Q=3.1e27 mol/sec
=====