Great January comet of 1910

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C/1910 A1 (Great January comet)
Discovery
Discovered by: Multiple observers
Discovery date: January 13, 1910
Alternate designations: 1910 I
1910a
Orbital characteristics A
Epoch: January 9, 1910 (JD 2418680.5)
Aphelion distance: 51600 AU
Perihelion distance: 0.128975 AU
Semi-major axis: 25800 AU
Eccentricity: 0.999995
Inclination: 138.7812°
Last perihelion: January 17, 1910

The Great January comet of 1910 or Great Daylight comet was a Great comet that in January 1910 upstaged the much-anticipated appearance of Halley's Comet in May of the same year. It was already visible to the naked eye when it was first noticed, and many people independently 'discovered' the comet. At its brightest, it was brighter than the planet Venus.

When Halley's Comet returned again in 1986, many older people's accounts of having seen it in 1910 clearly referred instead to the Great Daylight Comet.

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