Couldn't find element LayerAd

Error finding content

All Star Line Up: 40 Eridani B - Windows to the Universe

Shop Windows to the Universe

Please help support Windows to the Universe, and our activities to help Earth and space science teachers, with a tax-exempt donation today!
This drawing compares the Earth to the star, 40 Eridani B. Eridani B is a white dwarf in the constellation, Eridanus, "The River". It is very heavy for its size.
Travis Metcalfe

40 Eridani B - Burnt-Out Cinder

What's in a Name: Star designated 40 in the constellation Eridanus.
Claim to Fame: One of the first white dwarfs found. A white dwarf is the exposed extremely hot core of a star that has blown off its outer layers. Made of extremely dense material. A piece the size of a marble would weigh as much as an elephant.
Type of Star: Blue-White Color. Small hot white dwarf (Spectral Class DA4).
How Far Away: 16 light years
How Big:1/70 sun's radius (1.5 times the Earth's radius). About 1/2 the sun's mass.
How Bright:1/300 times the sun's visible brightness
Where to View: In the constellation of Auriga. Not visible to the unaided eye.
When to View: Best viewed from the Northern hemisphere during November-January.

Last modified January 31, 2005 by Travis Metcalfe.

Shop Windows to the Universe Science Store!

The Summer 2010 issue of The Earth Scientist, available in our online store, includes articles on rivers and snow, classroom planetariums, satellites and oceanography, hands-on astronomy, and global warming.

Windows to the Universe Community

News

Opportunities

You might also be interested in:

Cool It! Game

Check out our online store - minerals, fossils, books, activities, jewelry, and household items!...more

White Dwarfs

When stars like our own sun die they will become White Dwarfs. As a star like our sun is running out of fuel in its center it grows into a red giant. This will happen to our sun in 5 Billion years. The...more

Gamma Ray Bursts - The Most Powerful Objects in the Universe?

Satellites in the 1960's looked for a type of light called Gamma Rays. They found bursts of Gamma Rays coming from outer space! They can't hurt you. They are stopped by the Earth's atmosphere. We have...more

Galaxies - Star Cities

When we look up at the night sky, we notice that there are many stars in our sky. Stars must like to live together in star cities - galaxies. Our city of stars is called the Milky Way, and it is home to...more

Neutron Stars

Neutron Stars form when really big stars die. When such a star runs out of fuel its center begins to collapse under gravity. When the center collapses the entire star collapses. The surface of the star...more

Spiral Galaxies

Spiral galaxies may remind you of a pinwheel that blows in the breeze. Like a pinwheel, a spiral galaxy is rotating, and it has spiral arms. Through a telescope or binoculars,a spiral galaxy may look...more

Algol

What's in a Name: Arabic for "head of the demon" Claim to Fame: Represents Medusa's eye in Perseus. A special variable star that "winks" every 3 days. Type of Star: Blue-white Main Sequence Star, and...more

Sirius B - Bizarre White Dwarf Companion of Sirius A

What's in a Name: Nicknamed the "Pup" because it is the companion to Sirius, "the Dog Star" Claim to Fame: Highly compressed white dwarf remnant. Density about 50,000 times that of water. It has approximately...more

Windows to the Universe, a project of the National Earth Science Teachers Association, is sponsored in part by the National Science Foundation and NASA, our Founding Partners (the American Geophysical Union and American Geosciences Institute) as well as through Institutional, Contributing, and Affiliate Partners, individual memberships and generous donors. Thank you for your support! NASA AGU AGI NSF