Home » Eventos » Blood Moon: longest eclipse in a century (versión en ingles)
27
Julio
2018
Blood Moon: longest eclipse in a century
(versión en ingles)

ESA Space Science Image of the week

CESAR team witnessed and recorded, on 27th July 2018, the longer lunar eclipse in a century, from its location at ESAC (European Space Astronomy Center). A moon eclipse happens when the moon passes into Earth's shadow. Unlike with solar eclipses, you need no special equipment to observe lunar eclipses. You can safely view the eclipse directly with the naked eye.

The eclipse started in ESAC at 21:30 local time, with the Moon just on the horizon already in full umbra. The eclipse progressed for 1h42min in umbra until 23:13 CEST. At 00:19 the Moon left completely the umbra, and at 01:28 the eclipse ended.

 

The eclipse as seen from ESAC (images Manuel Castillo). Canon EOS550D (1sec exposure, ISO1600). Telescope CG8 20 cm aperture.

 

Eclipse timelapse.

 

Steady context cameras with Moon and Mars rising. Left: with Solar Helios dome in front (images Konstantin Karchev). Right: with ESAC D-building (courtesy of Cedric Pereira)

 

But the Moon does not go fully black during eclipse. It turns deep red because some of the sunlight passing Earth's atmosphere is refracted around our planet's limb and hits the moon's surface. Earth's air also scatters more shorter-wavelength light (in colors such as green or blue); what's left is the longer-wavelength, redder end of the spectrum. It is the same phenomena responsible for sunrises and sunsets: actually the Moon's blood color comes from all the sunrises and sunsets taking place at the same time around the world along the terminator line (day-night boundary).

What is an eclipse? (ESA infography)

 

For the event, the CESAR team set up several cameras and telescopes:

- 1 newtonian telescope CG8 20 cm aperture with a Canon EOS550D camera

- the white visible Solar dome telescope (9cm aperture) was modified into a Moon catcher, with a new color camera QHY-IIC, and a the solar filter removed.

- Canon XF200 pro-camera for livestream

- Fixed DSLR cameras for context images

The event was streamed live in a experimental set-up. You can re-watch the event in our youtube channel.

The event was twitted by ESA comms and ESAC-Spain comms (thanks Arantxa Alonso, Beatriz Arias and Emmet Fletcher @ ESAC, Emily Baldwin @ ESTEC). CESAR worked on several news around the event :

 

The observing team at CESAR's Solar dome Helios, ESAC

 

The ESAC astronomy club organized an event with 50+ people attendance (a sample timelapse from Wouter van Reeven is found here). 

Eventos relacionados
Total Solar Eclipse 2019 (en)
The CESAR team completed successfully their observation plans for the Total Eclipse 2019 Leer más
02
Julio
2019
Lunar eclipse from ESAC, 21 Jan 2019 (en)
Total lunar eclipse from ESAC Leer más
21
Enero
2019
Eclipse total 2017
El 21 de agosto de 2017, miembros del equipo ESA CESAR hicieron una emocionante expedición para observar el eclipse solar total, visible desde Estados Unidos. Leer más
21
Agosto
2017
La ISS cruzando la Luna
¿Has visto alguna vez la Estación Espacial Internacional cruzando la Luna? El equipo CESAR lo ha fotografiado para ti. Leer más
14
Enero
2017
Super Blood Moon eclipse (en)
CESAR Team take videos and photos from ESAC and other places during early morning Leer más
18
Septiembre
2015