Cepheid 4 NGC 4603

Harvard Observatory astronomer Henrietta S. Leavitt makes the first crucial step in establishing the distances to nearby "spiral nebulae." Studying variable stars in the Magellanic Clouds, she discovers the presence of rhythmically pulsating stars, known as Cepheid variables, which brighten and dim over a period of days. By observing the relationship between a Cepheid's brightness and its pulsation rate, astronomers can calculate how much light it emits and then use that number to estimate its distance.

Credit:

NASA & ESA

About the Image

NASA press release
NASA caption
Id:opo9919g
Type:Observation
Release date:25 May 1999, 17:00
Size:255 x 255 px

About the Object

Name:Cepheids, IRAS 12382-4042, NGC 4603
Type:• Local Universe : Star : Type : Variable
• Local Universe : Galaxy : Type : Spiral
• X - Galaxies Images/Videos
Distance:120 million light years

Colours & filters

BandWavelengthTelescope
Optical
V
555 nm Hubble Space Telescope
WFPC2
Infrared
I
814 nm Hubble Space Telescope
WFPC2

Image Formats

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Screensize JPEG
146.3 KB

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