This is a preview of subscription content, log in via an institution to check access.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Notes
- 1.
Ceres has now been re-classified as a dwarf planet. However, NASA and many textbooks still refer to it as an asteroid.
- 2.
Ceres , Vesta and Pallas are thought to be protoplanets that have survived the past 4.6 billion years.
- 3.
This shower is an enigma as its origin is currently unknown, and information about is sparse, as are observations.
- 4.
Due to the presence of a “horizontal branch” in the Hertzsprung-Russell diagram of M77, it is now classified as a relatively young (9–10 billion years), loosely concentrated globular cluster.
- 5.
The star has been observed to change slightly in brightness, possibly due to large flares, much bigger than those observed on the Sun. Thus, it has been classified as a type LC slow irregular variable star.
- 6.
As of July 2015, there are 1932 confirmed exoplanets, 1222 planetary systems and 484 multiple planets systems.
- 7.
As of July 2015, there are 10 Earth-sized exoplanets and 20 Super-Earths.
- 8.
The “odd” galaxy, NGC 7320 is a foreground object, about 40 million light years away, much closer than the others in the group, lying 290 million light years distant. It is accepted that it is a just a foreground object in the field of view.
Author information
Authors and Affiliations
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2015 Springer International Publishing Switzerland
About this chapter
Cite this chapter
Inglis, M. (2015). September. In: Inglis, M. (eds) Patrick Moore’s Observer’s Year: 366 Nights of the Universe. The Patrick Moore Practical Astronomy Series. Springer, Cham. https://doi.org/10.1007/978-3-319-18678-8_9
Download citation
DOI: https://doi.org/10.1007/978-3-319-18678-8_9
Publisher Name: Springer, Cham
Print ISBN: 978-3-319-18677-1
Online ISBN: 978-3-319-18678-8
eBook Packages: Physics and AstronomyPhysics and Astronomy (R0)