Janssen may refer to:

Astronomy

Janssen (lunar crater) Janssen is an ancient impact crater located in the highland region near the southeastern lunar limb. The entire structure has been heavily worn and is marked by many lesser crater impacts. The outer wall is breached in multiple locations, but ...

Janssen (Martian crater) Janssen Crater is an impact crater in the Arabia quadrangle on Mars at 2.7° N and 322.4° W. and is 154 km in diameter. Its name was approved in 1973, and refers to French astronomer Pierre Janssen. Some close up images of the crater r ...

Janssen (planet) 55 Cancri e (abbreviated 55 Cnc e), formally named Janssen , is an exoplanet orbiting a Sun-like host star, 55 Cancri A. The mass of the exoplanet is about eight Earth masses and its diameter is about twice that of the Earth. 55 Cancri e was d ...

, an exoplanet also known as 55 Cancri e

Other

Janssen (surname) Janssen () is a Dutch patronymic surname cognate to the English surname Johnson. It is the 7th most common name in the Netherlands and the most common (over 131,000 people), when combined with the spelling variant Jansen. Geographical distributi ...

is a common Dutch surname, cognate of "Johnson" *

Janssen Pharmaceuticals Johnson & Johnson Innovative Medicine (formerly Janssen Pharmaceuticals) is a Belgian pharmaceutical company headquartered in Beerse, Belgium, and wholly owned by Johnson & Johnson. It was founded in 1953 by Paul Janssen. In 1961, Janssen Ph ...

, a Belgian company **

Janssen Biotech Johnson & Johnson Innovative Medicine (formerly Janssen Pharmaceuticals) is a Belgian pharmaceutical company headquartered in Beerse, Belgium, and wholly owned by Johnson & Johnson. It was founded in 1953 by Paul Janssen. In 1961, Janssen Ph ...

, an American subsidiary **

Janssen COVID-19 vaccine The Janssen COVID19 vaccine, (Ad26.COV2.S) sold under the brand name Jcovden, is a COVID19 vaccine that was developed by Janssen Vaccines in Leiden, Netherlands, and its Belgium, Belgian parent company Janssen Pharmaceuticals, a subsidiary o ...

* , World War II US Navy destroyer escort *

E. Janssen Building The E. Janssen Building at 422 First Street, Eureka, California, is a two-story Italianate commercial building. It was built in 1875 to be a hardware and general merchandise store. In 1973, it was the first building in Eureka to be placed on the ...

, a historic building in Eureka, California

Astronomy

Other

See also