Guest star (astronomy)
Ancient Chinese term for a transient star, now linked to novae and supernovae.
In Chinese astronomy, a guest star refers to a star that unexpectedly appears in a location where none was previously seen and later fades from view. The name comes directly from the ancient Chinese term "kèxīng." Today, astronomers understand these events as cataclysmic variable stars, specifically novae and supernovae. The label "guest star" is reserved for historical records, as classifying these ancient events relies on interpreting old texts and making inferences rather than on direct observation.
Ancient Chinese astronomers grouped transient bright objects into three categories: guest stars; comets with tails, called "broom stars"; and tailless comets, known as "fuzzy stars." (In modern astronomy, all comets are simply called comets.) The earliest recorded guest star appears in the *Han Shu*, the history of the Han dynasty, and every subsequent dynastic history continued this practice. One of the clearest early descriptions consistent with a supernova is attributed to the year AD 185, now identified as a supernova remnant. European chronicles from the same period are less precise regarding supernova candidates. Astronomers have noted, for instance, that the remnant linked to a Chinese guest star observed in AD 1054 has no clear counterpart in European records, though whether this is due to weather or other factors remains unclear.
Quick Facts
- P
- kèxīng
- J
- haak3 sing1
- Wgn
- khaq7 sin1
- Mi
- k · e · 4 · - · x · ing · 1
- Ci
- h · aak · 3 · - · s · ing · 1
- Mc
- khaek seng (Baxter)
Facts from the source article.
Lore & Background
In ancient Chinese astronomy, guest stars were one of three types of highly transient bright heavenly bodies. The other two were comets with tails (彗星, literally 'broom star') and comets without tails (孛星, literally 'fuzzy star'), with the former term used for all comets in modern astronomy. The earliest Chinese record of guest stars is contained in the Han Shu, the history of the Han dynasty (206 BC – AD 220), and all subsequent dynastic histories had such records. These contain one of the clearest early descriptions consistent with a supernova, posited to be left over by object SN 185, thus identified as a supernova remnant of the exact year AD 185. Chronicles of contemporary Europeans are more vague when consulted for supernovae candidates. Astronomers have questioned why the remnant attributed to Chinese observations of a guest star in AD 1054 (see SN 1054) is missing from European records, whether due to weather or other reasons.
Reader's Guide
The term 'guest star' is notable because it preserves a precise observational tradition from ancient Chinese astronomy, providing some of the earliest clear descriptions of supernovae. Modern astronomy recognizes these events as cataclysmic variable stars—novae and supernovae—but the classification of each ancient record remains interpretive, based on inference rather than direct observation. The Chinese records, contained in dynastic histories from the Han onward, offer a continuous archive that contrasts with the vagueness of contemporary European chronicles. For example, the guest star of AD 1054 (SN 1054) is well documented in Chinese sources, yet its remnant is missing from European records, a discrepancy that astronomers have noted but not fully explained. This legacy underscores the value of ancient Chinese astronomy in identifying transient celestial phenomena and highlights the challenges of reconstructing historical astronomical events from incomplete records.
Did You Know?
- The term 'guest star' is a literal translation from ancient Chinese astronomical records.
- Guest stars are now recognized as manifestations of cataclysmic variable stars: novae and supernovae.
More in Variable Stars 1-24
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