2005A&A...437.1093N


C.D.S. - SIMBAD4 rel 1.7 - 2021.04.19CEST09:03:59

2005A&A...437.1093N - Astronomy and Astrophysics, volume 437, 1093-1108 (2005/7-3)

Some characteristics of the outer Oort cloud as inferred from observations of new comets.

NESLUSAN L. and JAKUBIK M.

Abstract (from CDS):

We study the outer Oort cloud (OC) by numerical integration of 126600 orbits of hypothetical comets representing this cometary reservoir. We determine the distribution of the semi-major axis a for 4.6≲log(a)≲5, and estimate its population and total mass, as well as some other characteristics. The distribution of the semi-major axis is found initially by assuming a constant log(a) distribution and then identifying the theoretically predicted log(a) distribution of new comets with their observed log(a) distribution. The semi-major axis of outer-OC comets ranges from log(a)≃4.35 to typically log(a)≃5 on the decadic-logarithm scale. The relative distribution of this element can, however, be roughly determined only for log(a)≳4.55: dN∝a–sda, where 0.6≲s≲0.8. The perihelion distribution of new comets with log(a)≲4.55 is not constant in the zone of visibility (ZV) and a bias due to the observational selection cannot be eliminated. The lower limit of the outer OC population is 1x1011 to 2x1011. The currently available cometary data do not allow us to give a more exact lower estimate or an average estimate of the population. The OC has also been depleted by the combined Galactic-tide-planetary (GTP) perturbation with a local maximum rate at log(a)≃4.5. The ratio of these comets that are lost from the outer OC and of new comets that enter into the ZV in the same time frame is ≃2.5. The distributions of the angular elements of new comets at their previous perihelion passage are used to evaluate the correctness of our model of the outer OC. Specifically, we calculated the root of mean squares between the corresponding theoretical and observed distributions of ω, Ω, and cos (i) resulting in 2-5% unexplained residua.

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Journal keyword(s): comets: general - Oort cloud - planets and satellites: formation

Simbad objects: 1

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Number of rows : 1

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 NAME Galactic Center gam 17 45 39.60213 -29 00 22.0000           ~ 12110 0

    Equat.    Gal    SGal    Ecl

C.D.S. - SIMBAD4 rel 1.7 - 2021.04.19CEST09:03:59

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NAME Galactic Center -- gamma-ray source
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    • D : 1-10" (and some old data)
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    • B : 0.01-0.1" + 2MASS, Tyc
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ICRS coord. (ep=J2000) :
17 45 39.60213 -29 00 22.0000 (Gamma-ray) [ ] E 2018A&A...612A...1H
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
  • ra dec : right ascension and declination (unit and frame defined according to your Output Options)
    Grey values are increasing the original precision due to the computation of frame transformations
  • (wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
  • [error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
    position angle (in degrees North celestial pole to East)
  • quality : flag of quality
    • E ≥ 10"
    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
  • bibcode : bibcode of the coordinates reference
FK4 coord. (ep=B1950 eq=1950) :
17 42 28.87566 -28 59 12.3570 [ ]
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
  • ra dec : right ascension and declination (unit and frame defined according to your Output Options)
    Grey values are increasing the original precision due to the computation of frame transformations
  • (wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
  • [error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
    position angle (in degrees North celestial pole to East)
  • quality : flag of quality
    • E ≥ 10"
    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
  • bibcode : bibcode of the coordinates reference
Gal coord. (ep=J2000) :
359.94487501 -00.04391769 [ ]
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GAL 000.0+00.0 NAME Gal Centre NAME Gal Center TeV J1745-290
HESS J1745-290 NAME Galactic Centre NAME Galactic Center VER J1745-290

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