2021ApJ...910L..27L

Query : 2021ApJ...910L..27L

2021ApJ...910L..27L - Astrophys. J., 910, L27-L27 (2021/April-1)

Rotational mass shedding from asteroid (6478) Gault.

LUU J.X., JEWITT D.C., MUTCHLER M., AGARWAL J., KIM Y., LI J. and WEAVER H.

Abstract (from CDS):

The ∼4 km diameter main belt asteroid 6478 Gault has ejected dust intermittently since at least 2013. The character of the emission, including its episodic nature and the low speed of the ejected particles (V ∼ 0.15 m s–1), is most consistent with mass loss from a body rotating near rotational breakup. Owing to dust contamination of the nucleus signal, this conclusion had not yet been confirmed. To test this idea, we have obtained new images of Gault in 2020 August in the absence of dust. Our photometry shows a lightcurve with a very small amplitude (maximum ∼0.05 mag) and a periodicity of 2.55 ± 0.10 hr. The new observations are consistent with a model in which Gault is rotating near breakup, with centrifugal forces responsible for its episodic mass loss. Approximated as a strengthless (fluid) spherical body, the implied density is ρ = 1700 kg m–3. We use the Froude number Fr, defined here as the ratio between centrifugal force and gravitational force, as a way to investigate mass-loss regimes in fast-spinning asteroids and find that mass shedding starts at Fr ∼ 0.5.

Abstract Copyright: © 2021. The American Astronomical Society. All rights reserved.

Journal keyword(s): Asteroids - Small Solar System bodies

Status at CDS : Large table(s) will be appraised for possible ingestion in VizieR.

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 Feige 11 HS* 01 04 21.6747168600 +04 13 37.054495956 10.847 11.826 12.065 12.183 12.324 sdB2VIHe4 136 0

Query : 2021ApJ...910L..27L

Basic data :
Feige 11 -- Hot Subdwarf
Other object types: otypes_help 		* (2020ApJS,HIP,...), HS* (1968ApJ), SB* (2008A&A,SBC9), blu (2019A&A,FB,...), UV (GALEX,PG), WD* (WD), NIR (2MASS), Opt (LAMOST)
ICRS coord. (ep=J2000) : 		01 04 21.6747168600 +04 13 37.054495956 (Optical) [ 0.0384 0.0294 90 ] A 2020yCat.1350....0G
FK4 coord. (ep=B1950 eq=1950) : 		01 01 46.5819849312 +03 57 33.980431186 [ 0.0384 0.0294 90 ]
Gal coord. (ep=J2000) : 		129.1054161585840 -58.4897953344696 [ 0.0384 0.0294 90 ]
Proper motions mas/yr : 		10.828 -29.553 [0.057 0.040 90] A 2020yCat.1350....0G
Radial velocity / Redshift / cz : 		V(km/s) 8.47 [0.34] / z(~) 0.000028 [0.000001] / cz 8.47 [0.34]
   A 2004A&A...424..727P
Parallaxes (mas): 		2.9344 [0.0464] A 2020yCat.1350....0G
Spectral type: 		sdB2VIHe4 B 2014yCat....1.2023S
Fluxes (9) :
U 10.847 [0.002] B 1992AJ....104..340L
B 11.826 [0.0007] B 2009AJ....137.4186L
V 12.065 [0.0007] B 2009AJ....137.4186L
R 12.183 [0.0007] B 2009AJ....137.4186L
G 12.025876 [0.002795] C 2020yCat.1350....0G
I 12.324 [0.0008] B 2009AJ....137.4186L
J 12.649 [0.028] C 2003yCat.2246....0C
H 12.756 [0.026] C 2003yCat.2246....0C
K 12.884 [0.024] C 2003yCat.2246....0C
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Identifiers (28) :
An access of full data is available using the icon Vizier near the identifier of the catalogue

HIP 5023 GEN# +6.20001011 PG 0101+039 UCAC2 33161546
CSI+03-01011 GSC 00022-00821 Renson 1630 uvby98 620001011
EPIC 220376019 HIC 5023 SBC9 2126 WD 0101+039
FB 13 LAMOST J010421.68+041336.5 TIC 344719037 [HMT98] AS 03-0
Feige 11 LAMOST J010421.67+041337.0 TYC 22-821-1 [TFW97] J010421.67+041337.26
FS 3 2MASS J01042167+0413369 UBV 1038 Gaia DR3 2551900379931546240
GALEX J010421.5+041340 PB 6252 UBV M 43300 Gaia DR2 2551900379931546240

References (136 between 1850 and 2026) (Total 136)
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 : 5    Distance : 3    Var : 2    Fe/H : 10    Plx : 4    PM : 4    SpT : 12   

   

Observing logs
IUE : 29   

   

External archives :

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

Link by name to the catalogue in VizieR :

HIP 5023 GALEX J010421.5+041340 GSC 00022-00821 HIC 5023 2MASS J01042167+0413369
PB 6252 PG 0101+039 TYC 22-821-1 UCAC2 33161546 uvby98 620001011
WD 0101+039 Gaia DR3 2551900379931546240 Gaia DR2 2551900379931546240

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