When did Richard A. Proctor discover the Ursa Major moving group?
Richard A. Proctor discovered the Ursa Major moving group in 1869 when he noticed that most stars in the Big Dipper moved toward a single point in Sagittarius.
Questions about Ursa Major moving group
Short answers, pulled from the story.
How old is the Ursa Major moving group and how far away is it from Earth?
The Ursa Major Moving Group formed from a protostellar nebula about 500 million years ago with its core lying approximately 80 light-years away from our solar system.
Which stars are members of the Ursa Major moving group and what are their spectral classes?
Fourteen primary stars form the dense core including Alioth with spectral type A0p and Mizar which displays spectral class A2V while none exceed spectral class A.
What constellations contain the wide stream of fainter stars belonging to the Ursa Major moving group?
A wide stream of fainter stars extends from Cepheus to Triangulum Australe across multiple constellations including Leo, Lepus, and Serpens.
Why do Dubhe and Alkaid not belong to the Ursa Major moving group?
Dubhe and Alkaid remain outside the group due to differing distances and velocities compared to the other fourteen primary stars that share the same kinematic signature.