Astronomy:Sigma Hydrids

Short description: Meteor shower

Sigma Hydrids
Celestial map of Hydra
Parent body	Unknown C/2023 P1 (Nishimura)?
Radiant
Constellation	Hydra
Right ascension	8h 19m 60s
Declination	+02° 00′ 00″
Properties
Occurs during	November 22 to January 4
Date of peak	December 7
Velocity	58.8 km/s
Zenithal hourly rate	3-7

Sigma Hydrids are a faint, minor (Class II) meteor shower that peak around 7 December. The ZHR is 3-7 and population index is 3. They are active from November 22 to January 4.

Sigma hydrids were discovered by Richard E. McCrosky and Annette Posen.

2023

Long-period comet C/2023 P1 (Nishimura) has been suggested to be the parent body of the meteor shower and came to perihelion (closest approach to the Sun) in September 2023. There is a chance of increased activity during the 2023 meteor shower if Earth passes through older meteoroid streams (such as 1591) that have had time to spread out over the comets orbit.

References

• P. Clay Sherrod; Thomas L. Koed (2012). A Complete Manual of Amateur Astronomy: Tools and Techniques for Astronomical Observations. Courier Corporation. p. 59. ISBN 978-0-486-15216-5. https://books.google.com/books?id=CjTDAgAAQBAJ&pg=PT100.