emamajek on 21-Jan-2019 07:36:45 GMT about HD 18143A
Spectral type:
K2V
1935ApJ....81..187A
(Adams classified both the primary and secondary; dwarf luminosity class appended by Skiff in compendium of MK classifications, but consistent with absolute magnitude)
Also, Gray classified it as K2IV (2003AJ....126.2048G) and does not list a classification of the secondary, but should have resolved the primary of this 5.5" binary (secondary is 2.3 magnitudes fainter).
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View annotation on HD 18143A object