Ultra-cool dwarfs: new discoveries, proper motions, and improved spectral typing from SDSS and 2MASS photometric colors

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Volume 497 / No 2 (April II 2009)

A&A, 497 2 (2009) 619-633

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Table 3:

Seven objects with SDSS spectra matched in UKIDSS.
SDSS Name	UKIDSS Y	UKIDSS J	UKIDSS H	UKIDSS K	Proper motion^a	Proper motion
					( $^{\prime\prime}$ yr^-1)	Angle^b
SDSS J012052.58+151827.3	17.11 $\pm$ 0.02	16.09 $\pm$ 0.01	15.50 $\pm$ 0.01	14.92 $\pm$ 0.01	0.04 $\pm$ 0.02	105 $\pm$ 36
SDSS J084751.48+013811.0	17.38 $\pm$ 0.02	16.09 $\pm$ 0.01	15.22 $\pm$ 0.01	14.45 $\pm$ 0.01	0.03 $\pm$ 0.02	242 ...
SDSS J090347.55+011446.0	17.58 $\pm$ 0.02	...	15.59 $\pm$ 0.01	14.96 $\pm$ 0.01	0.03 $\pm$ 0.02	259 ...
SDSS J091714.76+314824.8	...	16.36 $\pm$ 0.01	...	...	0.03 $\pm$ 0.03	345 ...
SDSS J100817.07+052312.9	...	...	16.36 $\pm$ 0.02	15.89 $\pm$ 0.03	0.21 $\pm$ 0.03	139 $\pm$ 10
SDSS J154502.87+061807.8	17.35 $\pm$ 0.02	16.21 $\pm$ 0.01	15.62 $\pm$ 0.01	15.07 $\pm$ 0.01	0.14 $\pm$ 0.04	251 $\pm$ 25
SDSS J155215.38+065041.5	...	...	15.93 $\pm$ 0.01	15.32 $\pm$ 0.01	0.02 $\pm$ 0.04	356 ...

^a SDSS-UKIDSS data-base proper motions - found by dividing the difference between the SDSS and UKIDSS coordinates (from the respective databases) by the observational epoch difference. Standard errors are calculated using the major axes of the position error ellipses from SDSS and UKIDSS; ^b error ellipses of SDSS and UKIDSS overlap for some objects for which position angle errors are not meaningful.

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