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![Halley's Comet](http://upload.wikimedia.org/wikipedia/commons/thumb/2/2a/Lspn_comet_halley.jpg/80px-Lspn_comet_halley.jpg)
the only known short-period comet that is consistently visible to the naked eye from Earth, appearing every 72–80 years. It last appeared in the inner
![Apparent magnitude](http://upload.wikimedia.org/wikipedia/commons/thumb/8/87/65Cyb-LB3-apmag.jpg/80px-65Cyb-LB3-apmag.jpg)
Venus at −4.2 or Sirius at −1.46. The faintest stars visible with the naked eye on the darkest night have apparent magnitudes of about +6.5, though this
![UY Scuti](http://upload.wikimedia.org/wikipedia/commons/thumb/9/97/UY_Scuti_zoomed_in%2C_DSS2_survey%2C_2003.png/80px-UY_Scuti_zoomed_in%2C_DSS2_survey%2C_2003.png)
magnitude 8.29 and a minimum of magnitude 10.56, which is too dim for naked-eye visibility. It is considered to be one of the largest known stars, with
![Sigma Octantis](http://upload.wikimedia.org/wikipedia/commons/thumb/7/76/Octans_IAU.svg/80px-Octans_IAU.svg.png)
equinoxes. At magnitude +5.42, Sigma Octantis is barely visible to the naked eye, making it unusable for navigation, especially by comparison with the
![Comet NEOWISE](http://upload.wikimedia.org/wikipedia/commons/thumb/b/ba/Comet_2020_F3_%28NEOWISE%29_on_Jul_14_2020_aligned_to_stars.jpg/80px-Comet_2020_F3_%28NEOWISE%29_on_Jul_14_2020_aligned_to_stars.jpg)
enough to be visible to the naked eye. Under dark skies, it could be seen with the naked eye and remained visible to the naked eye throughout July 2020. By