"Anchor" zviyero zvinotsanangura MK kupatsanura grid nokuda O-mhando huru-kutevedzana nyeredzi, i.e. avo mitemo kuti havana kuchinja kubvira pakutanga kwezana remakore rechi20, vari 15 Monocerotis (O7 V) uye 10 Lacertae (O9 V).The Morgan<unk>Keenan<unk>Kellerman (MKK) "Yerkes" atlas kubva 1943 akanyorwa O-mhando zviyero pakati O5 uye O9, asi chete kupatsanura luminosity nokuda O9s makirasi. The zviviri MKK O9 V mitemo vaiva Iota Orionis uye 10 Lacertae. The dzakaongororwa Yerkes mitemo ("MK") dzakarongwa muna Johnson & Morgan (1953) hapana kuchinja kune O5 kuna O8 mhando, uye 5 O9 VHD mitemo (HD 46202, 5226, 5768, 14 HD, 10 Lacertae) uye 3 O9 V5 (O078, 34 V) mitemo. "Reference" zvakare rakanyorwa nokuda O9 mhando zviyero pakati O5 uye O9 makirasi.
MKK O9 V