Eta Cassiopeiae

Encyclopedia : E : ET : ETA : Eta Cassiopeiae

|- style="vertical-align: top;" | B-V color index | |- style="vertical-align: top;" | U-B color index | |- style="vertical-align: top;" | Variable type |

|- ! style="background-color: #FFFFC0;" colspan="2" | Visual binary orbit |- style="vertical-align: top;" | Companion | Gl 34B |- style="vertical-align: top;" | Period (P) | 480 years |- style="vertical-align: top;" | Semimajor axis (a) | 11.99" |- style="vertical-align: top;" | Eccentricity (e) | 0.497 |- style="vertical-align: top;" | Inclination (i) | 34.76° |- style="vertical-align: top;" | Node (Ω) | 98.42° |- style="vertical-align: top;" | Periastron epoch (T) | 88.59

|- ! style="background-color: #FFFFC0;" colspan="2" | Details |- |style="vertical-align: baseline;" | Mass | M_☉ |- |style="vertical-align: baseline;" | Radius | R_☉ |- |style="vertical-align: baseline;" | Luminosity | L_☉ |- |style="vertical-align: baseline;" | Temperature | K |- |style="vertical-align: baseline;" | Metallicity | |- |style="vertical-align: baseline;" | Rotation | |- |style="vertical-align: baseline;" | Age | })<()or(}})=()and(}})<())}}} years

|- ! style="background-color: #FFFFC0;" colspan="2" | Other designations |- | colspan="2" |

The primary star in the η Cassiopeiae system is a yellow dwarf (main sequence) star of spectral type G3 V, putting it in the same spectral class as our Sun, which is of spectral type G2V. It therefore resembles what our Sun might look like if we were to observe it from η Cassiopeiae. The star is of apparent magnitude 3.45. The star has a cooler and dimmer (magnitude 7.51) orange dwarf companion of spectral type K7V. The system is an RS Canum Venaticorum type variable star and its brightness varies by 0.05 magnitudes.

There are six dimmer optical components listed in the Washington Double Star Catalog. However, none of them are related to the η Cassiopeiae system and are in reality more distant stars.

In fiction

• In the Star Trek science fiction franchise, the planet Terra Nova, also known as Eta Cassiopeia III (note spelling), is located in the η Cassiopeiae system.

External links

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