2011A&A...531A..11S

Query : 2011A&A...531A..11S

2011A&A...531A..11S - Astronomy and Astrophysics, volume 531A, 11-11 (2011/7-1)

Frozen to death? detection of comet Hale-Bopp at 30.7 AU.

SZABO GY.M., SARNECZKY K. and KISS L.L.

Abstract (from CDS):

Comet Hale-Bopp (C/1995 O1) has been the most interesting comet ever encountered by modern astronomy, which continued to display significant activity at a solar distance of 25.7AU. It is unclear when and how this activity will finally cease. We present new observations with the ESO 2.2m telescope at La Silla to monitor the activity of Hale-Bopp at 30.7AU solar distance. On 2010-12-04, 26 CCD images were taken with 180 s exposure times for photometry and morphology. The comet was detected in R and had a total brightness of 23.3±0.2mag, which corresponds to an absolute brightness of R(1,1,0)=8.3.mag The profile of the coma was star-like at a seeing of 1.9", without any evidence of a coma or tail extending farther than 2.5" (=55000km in projection) and exceeding 26.5mag/arcsec2 surface brightness. The measured total brightness corresponds to a relative total reflecting surface, aRC, of 485km2, nine times less than three years before. The calculated aRC value would imply a nucleus with 60-65km radius assuming 4% albedo. This size estimate contradicts significantly the previous results scattering around 35km. We propose that the comet may still be in a low level of activity, despite the lack of a prominent coma. Alternatively, if the nucleus is already dormant, the albedo should be as high as 13%, assuming a radius of 35km. With this observation, Hale-Bopp has become the most distant comet ever observed, far beyond the orbit of Neptune.

Abstract Copyright: ∼

Journal keyword(s): comets: individual: glutag{Viz.comet "C/1995 O1"|Hale-Bopp} - techniques: photometric

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 - 2024 		#notes
1 UCAC2 32632 * 00 39 51.1707134952 -86 32 26.943664128       13.21 12.42 ~ 1 0

Query : 2011A&A...531A..11S

Basic data :
UCAC2 32632 -- Star
Origin of the objects types :

(Ref) Object type as listed in the reference "Ref"
(acronym) Object type linked to the acronym according to the original reference
() Anterior to 2007, before we can link the objet type to a reference, or given by the CDS team in some particular cases

Other object types: 		* (UCAC2,UCAC3,...), NIR (DENIS,2MASS)
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
ICRS coord. (ep=J2000) : 		00 39 51.1707134952 -86 32 26.943664128 (Optical) [ 0.0130 0.0131 90 ] A 2020yCat.1350....0G
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) : 		00 40 37.8032426830 -86 48 54.200259036 [ 0.0130 0.0131 90 ]
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) : 		303.1348297416492 -30.5828694914177 [ 0.0130 0.0131 90 ]
Syntax of proper motions is : "pm-ra pm-dec [error ellipse] quality bibcode"
  • pm-ra : mu-ra*cos(dec) (expressed in the ICRS system in mas/yr)
  • pm-dec : mu-dec (expressed in the ICRS system in mas/yr)
  • [error ellipse] : error major axis and minor axis (in mas), orientation angle (in deg)
  • quality : flag of quality (A=best quality -> E=worst quality, {� } =unknown quality)
  • bibcode : bibcode of the proper motion reference
Proper motions mas/yr : 		11.486 0.768 [0.017 0.020 90] A 2020yCat.1350....0G
Syntax of parallax is : 'value quality [error] bibcode'
  • value : parallax value
  • quality : flag of quality (A=best quality -> E=worst quality, {� } =unknown quality)
  • [error] : mean error
  • bibcode : bibcode of the parallax reference
Parallaxes (mas): 		0.402 [0.0143] A 2020yCat.1350....0G
Syntax of fluxes (or magnitudes) is : "filter-name (System) flux-value [error] quality MultVarFlags bibcode"
  • filter-name : U, B, V, R, I, G, J, H, K, u, g, r, i, z
  • (System) : may be AB (default is Vega)
  • flux-value : value of flux or magnitude
  • [error] : error value
  • quality : flag of quality of the flux value ( A=best quality -> E=worst quality, {� } =unknown quality)
  • MultVarFlags : Mult is zero or one char (J) for joined photometry ; Var can be zero or two chars (V[0-4])
  • bibcode : bibcode of the flux reference
Fluxes (6) :
R 13.21 [~] C 2003yCat.1289....0Z
G 13.274412 [0.002759] C 2020yCat.1350....0G
I 12.42 [0.02] C 2005yCat.2263....0D
J 11.556 [0.022] C 2003yCat.2246....0C
H 10.990 [0.025] C 2003yCat.2246....0C
K 10.859 [0.020] C 2003yCat.2246....0C
SIMBAD within arcmin
', {sourceSize:12, color:'#30a090'})); aladin.on('objectClicked', function(object) { var objName=object.data.MAIN_ID; aladin.showPopup(object.ra,object.dec,'',''+ objName+''); });" title="Show Simbad objects"> Overlay Simbad points in this preview
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The search radius has to be specified by the user. It is currently limited to a maximum of 30 arcsec. It depends mostly on the precision or quality of the coordinates (SIMBAD and VizieR catalogs), the resolution of the images from which the sources were extracted, source extent, and source crowding.
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The link on the acronym of the identifiers give access to the information for this acronym in the dictionary of nomenclature.
Identifiers (10) :
An access of full data is available using the icon Vizier near the identifier of the catalogue

UCAC2 32632 DENIS J003951.1-863226 TIC 405457177 Gaia DR3 4616230407360979584
DENIS J003951.0-863226 DENIS J003951.1-863227 UCAC3 7-422
DENIS J003951.0-863227 2MASS J00395120-8632270 Gaia DR2 4616230407360979584

References (1 between 1850 and 2024) (Total 1)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).
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distance : 2    PLX : 2    PM : 2   

   

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UCAC2 32632 DENIS J003951.0-863226 DENIS J003951.0-863227 DENIS J003951.1-863226 DENIS J003951.1-863227
2MASS J00395120-8632270 UCAC3 7-422 Gaia DR2 4616230407360979584 Gaia DR3 4616230407360979584

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