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天樞(Celestial pivot[1]),喺星官北極之下第五粒星,所以又叫北極五。天樞嘅意思,係天旋嘅中樞,皆因佢曾經極近天球北極。因為歲差嘅原因,喺唐之後代替HD 11112做北極星。又因為歲差嘅原因,到咗大清,就畀勾陳一替咗佢個位[2]。所以,因為天樞做過北極星,所以佢嘅星官就叫北極。
天樞喺西洋天文來講,就喺鹿豹座嘅範圍。天樞光等只有5.3等,所以西洋來講唔係咁注重。佢嘅HD號碼係HD 112028。
天樞離地球約莫300光年。光譜為A1IIIShell。
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