2019AJ....157..173K

Query : 2019AJ....157..173K

2019AJ....157..173K - Astron. J., 157, 173-173 (2019/May-0)

Stellar occultation by Comet 67P/Churyumov-Gerasimenko observed with Rosetta's Alice far-ultraviolet spectrograph.

KEENEY B.A., STERN S.A., FELDMAN P.D., A'HEARN M.F., BERTAUX J.-L., FEAGA L.M., KNIGHT M.M., MEDINA R.A., NOONAN J., PARKER J.W., PINEAU J.P., SCHINDHELM R.N., STEFFL A.J., VERSTEEG M., VERVACK R.J. and WEAVER H.A.

Abstract (from CDS):

Following our previous detection of ubiquitous H2O and O2 absorption against the far-ultraviolet continuum of stars located near the nucleus of Comet 67P/Churyumov-Gerasimenko, we present a serendipitously observed stellar occultation that occurred on 2015 September 13, approximately one month after the comet's perihelion passage. The occultation appears in two consecutive 10-minute spectral images obtained by Alice, Rosetta's ultraviolet (700-2100 Å) spectrograph, both of which show H2O absorption with column density >1017.5 cm–2 and significant O2 absorption (O2/H2O ≃ 5%-10%). Because the projected distance from the star to the nucleus changes between exposures, our ability to study the H2O column density profile near the nucleus (impact parameters <1 km) is unmatched by our previous observations. We find that the H2O and O2 column densities decrease with increasing impact parameter, in accordance with expectations, but the O2 column decreases ∼3 times more quickly than H2O. When combined with previously published results from stellar appulses, we conclude that the O2 and H2O column densities are highly correlated, and O2/H2O decreases with the increasing H2O column.

Abstract Copyright: © 2019. The American Astronomical Society. All rights reserved.

Journal keyword(s): comets: individual: 67P - ultraviolet: planetary systems

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 - 2026 		#notes
1 * eta Phe dS* 00 43 21.2101237138 -57 27 47.028593879   4.350 4.361     A0IV 100 0

Query : 2019AJ....157..173K

Basic data :
* eta Phe -- delta Sct Variable
Other object types: otypes_help 		* (*,CPC,...), dS* (2019ApJ), UV (TD1), NIR (2MASS)
ICRS coord. (ep=J2000) : 		00 43 21.2101237138 -57 27 47.028593879 (Optical) [ 0.0930 0.0942 90 ] A 2020yCat.1350....0G
FK4 coord. (ep=B1950 eq=1950) : 		00 41 06.7024295803 -57 44 13.201632030 [ 0.0930 0.0942 90 ]
Gal coord. (ep=J2000) : 		305.0821438759671 -59.6314241274870 [ 0.0930 0.0942 90 ]
Proper motions mas/yr : 		6.136 11.628 [0.131 0.114 90] A 2020yCat.1350....0G
Radial velocity / Redshift / cz : 		V(km/s) 16.18 [1.80] / z(spectroscopic) 0.000054 [0.000006] / cz 16.18 [1.80]
   (Opt) B 2022yCat.1355....0G
Parallaxes (mas): 		12.4614 [0.1232] A 2020yCat.1350....0G
Spectral type: 		A0IV C 1975MSS...C01....0H
Fluxes (6) :
B 4.350 [0.014] D 2000A&A...355L..27H
V 4.361 [0.009] D 2000A&A...355L..27H
G 4.321069 [0.003049] C 2022yCat.1355....0G
J 4.160 [0.290] D 2003yCat.2246....0C
H 4.354 [0.076] C 2003yCat.2246....0C
K 4.308 [0.027] C 2003yCat.2246....0C
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Identifiers (37) :
An access of full data is available using the icon Vizier near the identifier of the catalogue

* eta Phe GJ 31.1 A N30 147 UBV 587
** HJ 3391A GJ 9023 A PLX 137 UBV M 7601
CCDM J00434-5728A GSC 08469-01596 PPM 330455 uvby98 100004150 A
CPC 20 211 HD 4150 Renson 1130 WDS J00434-5728A
CPD-58 42 HIC 3405 SACS 10 WEB 602
CSI-58 42 41 HIP 3405 SAO 232162 Gaia DR2 4908022136034353152
FK5 23 HR 191 SKY# 1133 Gaia DR3 4908022136034353152
GC 866 IDS 00389-5801 A TD1 402
GCRV 397 JP11 412 TIC 281703963
GEN# +1.00004150A 2MASS J00432123-5727470 TYC 8469-1596-1

References (100 between 1850 and 2026) (Total 100)
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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Collections of Measurements Description of Measurements

Velocities : 9    Distance : 2    Rot : 8    Fe/H : 3    Plx : 4    PM : 6    SpT : 8   

   

External archives :

Archive data at HEASARC - High-Energy Astrophysics Science Archive Research Center

Link by name to the catalogue in VizieR :

CCDM J00434-5728A CPD-58 42 FK5 23 GJ 31.1 A GJ 9023 A
GSC 08469-01596 HD 4150 HIC 3405 HIP 3405 HR 191
2MASS J00432123-5727470 PLX 137 PPM 330455 SAO 232162 TD1 402
TYC 8469-1596-1 uvby98 100004150 A WDS J00434-5728A Gaia DR2 4908022136034353152 Gaia DR3 4908022136034353152

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