2008ApJ...683L.199T

Diameters and albedos of three subkilometer near-earth objects derived from Spitzer observations.

TRILLING D.E., MUELLER M., HORA J.L., FAZIO G., SPAHR T., STANSBERRY J.A., SMITH H.A., CHESLEY S.R. and MAINZER A.K.

Near-Earth objects (NEOs) are fragments of remnant primitive bodies that date from the era of solar system formation. At present, the physical properties and origins of NEOs are poorly understood. We have measured thermal emission from three NEOs–(6037) 1988 EG, 1993 GD, and 2005 GL–with Spitzer's IRAC instrument at 3.6, 4.5, 5.8, and 8.0 µm (the last object was detected only at 5.8 and 8.0 µm). The diameters of these three objects are 400, 180, and 160 m, respectively, with uncertainties of around 20% (including both observational and systematic errors). For all three the geometric albedos are around 0.30, in agreement with previous results that most NEOs are S-class asteroids. For the two objects detected at 3.6 and 4.5 µm, diameters and albedos based only on those data agree with the values based on modeling the data in all four bands. This agreement, and the high sensitivity of IRAC, shows the promise of the Spitzer Warm Mission for determining the physical parameters for a large number of NEOs.

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	HD 165459	*	18 02 30.7405607784	+58 37 38.159882076		6.98	6.86		6.70	A1V	54	0

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`HD 165459`	`GEN# +1.00165459`	`PPM 36333`	`uvby98 100165459`
`AG+58 1104`	`GSC 03915-01288`	`SAO 30711`	`YZ 58 9605`
`AGKR 16101`	`HIC 88349`	`SKY# 32728`	`Gaia DR3 2152139190687051008`
`AP J18023073+5837381`	`HIP 88349`	`TD1 21621`	`Gaia DR2 2152139190687051008`
`BD+58 1781`	`2MASS J18023073+5837381`	`TIC 383623835`
`GC 24604`	`PMC 90-93 4258`	`TYC 3915-1288-1`

`HD 165459`	`AG+58 1104`	`AP J18023073+5837381`	`BD+58 1781`	`GSC 03915-01288`
`HIC 88349`	`HIP 88349`	`2MASS J18023073+5837381`	`PPM 36333`	`SAO 30711`
`TD1 21621`	`TYC 3915-1288-1`	`uvby98 100165459`	`Gaia DR3 2152139190687051008`	`Gaia DR2 2152139190687051008`