Lambda Serpentis (λ Ser, λ Serpentis) is a star in the constellation Serpens, in its head (Serpens Caput). It has an apparent visual magnitude of 4.43,2 making it visible to the naked eye. Based upon parallax measurements from the Hipparcos satellite, this star lies at a distance of about 38.3 light-years (11.7 parsecs) from Earth. This star is larger and more massive than the Sun, although it has a similar stellar classification. It is shining with nearly double the Sun's luminosity and this energy is being radiated from the star's outer atmosphere at an effective temperature of 5,884 K.
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In Space Opera
- Blue Planet (1997, 2000), two releases of a pencil-and-paper role playing game designed by Jeff Barber et al, and published by Biohazard Games (v1) and Fantasy Flight Games (v2). Just before a worldwide ecological catastrophe devastates the Earth, space explorers discover that Lambda Serpentis II is a habitable ocean planet; they give it the name Poseidon. One major colony ship is sent before civilization collapses on Earth.
- Halo? (2001–), video game franchise created by Bungie and published by Microsoft Game Studios. The Lambda Serpentis system is home to the human colony planet Jericho VII?.
- Acquisition? (2002), episode of Star Trek: Enterprise? written by Rick Berman? and Brannon Braga?, as part of the film, television, and print franchise originated by Gene Roddenberry?. The episode makes reference to the planet Stameris?. The fictional reference book Star Trek Star Charts? (2002) depicts Lambda Serpentis as a binary star with two class G components, and identifies it as the location of Stameris.
- Location of the planet Margrave in the Known Space Universe.