Rangarira ndima iri pasi apa uye ipapo pindura mubvunzo gare gare mumutauro mumwe chetewo sechikamu:  Passage: "Anchor" zviyero zvinotsanangura MK classification grid yeO-mhando huru-yekuteedzana nyeredzi, kureva izvo zviyero zvisina kuchinja kubvira kutanga kwezana ramakore rechi20, ndeye 15 Monocerotis (O7 V) uye 10 Lacertae (O9 V).The Morgan<unk>Keenan<unk>Kellerman (MKK) "Yerkes" atlas kubva muna 1943 yakanyorwa O-mhando zviyero pakati peO5 neO9, asi yakakamurwa chete kupenya makirasi eO9s. Zviratidzo zviviri zvaMKK O9 V zvaiva Iota Orionis na10 Lacertae. Maitiro akavandudzwa aYerkes ("MK") akaratidzwa akanyorwa muJohnson & Morgan (1953) haana kupa shanduko kune O5 kusvika kuO8 mhando, uye akanyorwa 5 O9 V zviyero (HD 46202, HD 52266, HD 57682, 14 Cephei, 10 Lacertae) uye 3 O9.5 V zviyero (HD 34078, Sigma Orionis, Zeta Ophiuchi). Ongororo inokosha pamusoro pekugoverwa kwechiedza naMorgan & Keenan (1973) yakanyorwa "yakadzokororwa MK" zviyero zveO4 kusvika kuO7, asi zvakare pasina kupatsanurwa kwezviyero nemakirasi ekupenya. Kuongorora uku kwakaratidzawo "zviyero zvechipfuramabwe" zveO9 V ye10 Lacertae uye O9.5 V yeSigma Orionis.  Mubvunzo: Nheyo dzeIota Orionis ne10 Lacartae dzaishandisirwei?
MKK O9 V