Sigma Hydrids
Celestial map of Hydra
Parent body	Unknown C/2023 P1 (Nishimura)?
Radiant
Constellation	Hydra
Right ascension	8^h 19^m 60^s
Declination	+02° 00′ 00″
Properties
Occurs during	November 22 to January 4^[1]
Date of peak	December 7
Velocity	58.8^[1] km/s
Zenithal hourly rate	3-7
See also: List of meteor showers

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.^[1]

Sigma hydrids were discovered by Richard E. McCrosky and Annette Posen.^[2]

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)^[3] that have had time to spread out over the comets orbit.^[4]

References

^ ^a ^b ^c "2023 Meteor Shower List". American Meteor Society (AMS). Retrieved 2023-09-10.
^ [1] archive:[2]
^ Tp = 2302476.6 converts to 1591.
^ Green, Daniel. "Electronic Telegram No. 5290: COMET C/2023 P1 (NISHIMURA)". Central Bureau for Astronomical Telegrams. Harvard University. Retrieved 29 August 2023.

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.

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Related topics	American Meteor Society Earth-grazing fireball International Meteor Organization Meteor procession North American Meteor Network Population index Radiant Zenithal Hourly Rate
See also List of meteor showers