Vega Island: Landsat shows Antarctic snow and exposed ice
NASA released 2025 and 2026 Vega Island imagery on 30 October. Snow, ice and rock require careful attention to season and acquisition date.
RockGeo Editorial · Published on
Event date: 10/10/2026 · Source date: 10/30/2026
Sources accessed on 10/30/2026, 15:02 GMT
NASA Earth Observatory / Lauren Dauphin; Landsat / USGS · NASA Media Usage Guidelines — informational/editorial use
NASA Earth Observatory released an orbital comparison of Vega Island, east of the Antarctic Peninsula in the Weddell Sea, on 30 October 2026. Lindsey Doermann’s report brings together Landsat 9 scenes from 22 March 2025 and 10 October 2026. They record the start of austral autumn and spring, respectively.
The March scene shows snow cover; October contains areas of darker exposed ice. According to glaciologist Mauri Pelto’s interpretation cited by NASA, above-average winter temperatures, limited snow accumulation, sublimation and wind scouring contributed to October’s appearance. The comparison does not show the same month in consecutive years.
OLI observes radiation in visible, near-infrared and shortwave-infrared bands. Technical documentation specifies 30 m spatial resolution for multispectral bands and 15 m for the panchromatic band, across a 185 km swath. These values describe the sensor and should not be confused with the display size of an image on a screen.
The report identifies a nunatak, a lateral moraine and Bahía del Diablo Glacier among features resembling a face in profile. The resemblance is visual; geoscientific interest lies in relationships between rock, sediment and ice. Pelto notes that bare ice, darker than snow, absorbs more solar energy. The isolated image does not provide a mass-loss rate.
Continuity of Landsat measurements supports image classification, land-cover change detection and environmental mapping, according to OLI documentation. Calibration and band registration are part of that work. Here, the 10 October file is preserved in full, including labels and scale; its acquisition date remains distinct from the news publication date.