Hubble image archive
Neptune Dark Spot
Hubble Uncovers a Pair of Dark Vortices on NeptuneThis Hubble Space Telescope snapshot of the dynamic blue-green planet Neptune reveals a monstrous dark storm [top center] and the emergence of a smaller dark spot nearby [top right].The giant vortex, which is wider than the Atlant...
- Date
- Jan 1, 2020
- Mission
- Hubble Space Telescope
- Archive ID
- hubblesite-images-2020-59-4787-image
Hubble Uncovers a Pair of Dark Vortices on Neptune
This Hubble Space Telescope snapshot of the dynamic blue-green planet Neptune reveals a monstrous dark storm [top center] and the emergence of a smaller dark spot nearby [top right].
The giant vortex, which is wider than the Atlantic Ocean, was traveling south toward certain doom by atmospheric forces at the equator when it suddenly made a U-turn and began drifting back northward.
Hubble's Wide Field Camera 3 captured this visible-light image on Jan. 7, 2020, the same time a slightly smaller dark spot mysteriously appeared nearby. That spot then vanished a few months later. The smaller feature may have been a piece of the giant storm that broke off as the larger vortex approached the equator.
Hubble uncovered the giant storm in September 2018 in Neptune's northern hemisphere. The feature is roughly 4,600 miles across. The estimated width of the smaller spot is 3,900 miles.
The large storm is the fourth transient dark spot Hubble has observed since 1993. NASA's Voyager 2 spacecraft first imaged two dark features in Neptune's southern hemisphere in 1989 as Voyager flew by the distant planet. Those storms had disappeared by the time Hubble looked at Neptune in 1994. However, Hubble detected two new dark spots in the planet's northern hemisphere in 1994 and 1996.
It's unclear how these storms form. Their clouds may be rising to higher altitudes, compared to surrounding regions in the gas giant's atmosphere.
Neptune's predominant blue color is due to the absorption of red light by the distant planet's methane-rich atmosphere.
Credits
NASA, ESA, STScI, M.H. Wong (University of California, Berkeley) and L.A. Sromovsky and P.M. Fry (University of Wisconsin-Madison)Image Details
| About The Object | |
|---|---|
| Object Name | Neptune |
| Object Description | Neptune with two dark spots |
| Distance | Neptune was approximately 2.83 billion miles from Earth at the time of observations |
| About The Data | |
| Data Description | The HST observations include those from program (M.Wong) |
| Instrument | WFC3/UVIS |
| Exposure Dates | 07 January 2020, 08 January 2020 |
| Filters | F467M, F547M, F763M |
| About The Image | |
| Color Info | These images are a composite of separate exposures acquired by the WFC3 instrument on the Hubble Space Telescope. Several filters were used to sample medium wavelength ranges. The color results from assigning different hues (colors) to each monochromatic (grayscale) image associated with an individual filter. In this case, the assigned colors are:Blue: F467MGreen: F547MRed: F763MTo enhance the contrast between dark features and their surroundings, many individual Hubble exposures were combined, and an average background map was subtracted to remove the geometrical effect of limb darkening. |
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Source
Image and source material are credited to the official mission archive linked below.
View on NASA.gov