Tau Herculids

Tau Herculids
Radiant of the Tau Herculids in 2022 near Arcturus / 9 Boo
Parent body	73P/Schwassmann–Wachmann
Radiant
Constellation	Boötes^[1]
Right ascension	13^h 56^m
Declination	+28°
Properties
Occurs during	May 19 – June 19
Date of peak	May 31^[1]
Velocity	16^[1] km/s
Zenithal hourly rate	variable (Class III)
See also: List of meteor showers

The Tau Herculids (TAH #0061) are a meteor shower that when discovered in 1930 appeared to originate from the star Tau Herculis. The parent comet of the Tau Herculids is periodic comet Schwassmann-Wachmann 3 with a 5.4 year orbital period. This meteor shower occurs from May 19 - June 19. The meteor shower was first observed by the Kwasan Observatory in Kyoto, Japan in May 1930. The Tau Herculids' average radiant was α=236°, δ=+41°.^[2] Due to orbital perturbations of the meteor streams by Jupiter, 2022 activity will have a radiant of R.A. = 13:56 (209), Decl. = +28 (North-West of the star Arcturus in the constellation Boötes).^[1] The meteors are relatively slow moving making atmospheric entry at around 16 km/s (36,000 mph).

On 31 May 1930 the comet passed about 0.062 AU (9.3 million km; 5.8 million mi) from Earth,^[3] on 9 June 1930 a meteor outburst with a zenithal hourly rate of around 100 was observed,^[4] and then the comet passed perihelion (closest approach to the Sun) on 14 June 1930.

On 30–31 May 2022 (31 May 4:00-5:00 UT) there was a modest meteor shower generated by fragments from the 1995 break-up of the parent comet 73P.^[5]^[6] This required that fragments had been migrating ahead of the comet for the last 27 years.^[7] The parent comet has 69 known fragments^[8] and does not come to perihelion (0.97 AU from the Sun) until 25 August 2022.^[9] On 30 May 2022 comet 73P/Schwassmann–Wachmann was 1.5 AU from the Sun and 1.4 AU (210 million km) from Earth.^[10] The next notable appearances of the Tau Herculids are expected in 2033^[6] and 2049.^[4]

References

^ ^a ^b ^c ^d Peter Jenniskens (30 May 2022). "Anticipating a meteor outburst: Global CAMS video network detects first 2022 tau Herculids". Meteor News. Retrieved 2022-05-30.
^ "Meteor Showers Online". Archived from the original on 18 July 2018.
^ "Horizons Batch for 73P [1930] (90000728) Earth approach on 1930-05-31" (r is distance from the Sun and delta is the distance from Earth). JPL Horizons. Retrieved 2022-06-05.
^ ^a ^b Weigert, P.A.; Brown, P.G.; Vaubaillon, J.; Schijns, H. (2005). "The τ Herculid meteor shower and Comet 73P/Schwassmann-Wachmann 3". Monthly Notices of the Royal Astronomical Society. 361 (2): 638–644. Bibcode:2005MNRAS.361..638W. doi:10.1111/j.1365-2966.2005.09199.x.
^ Joe Rao (2022-05-26). "Update on a Possible Outburst of Meteors". Sky & Telescope. Retrieved 2022-05-29.
^ ^a ^b Robert Lunsford (2022-06-06). "Observed Meteor Outburst of tau-Herculids!". International Meteor Organization. Retrieved 2022-06-07.
^ Lee Mohon (2022-05-27). "New meteor shower? How many meteors will I see, really?". NASA. Retrieved 2022-05-29.
^ "JPL Small-Body Database Browser: 73P/Schwassmann–Wachmann (69 objects)". Retrieved 2022-05-29.
^ "73P/Schwassmann-Wachmann Orbit". Minor Planet Center. Retrieved 2022-05-29.
^ "Horizons Batch for 73P (90000733) on 2022-05-30" (r is distance from the Sun and delta is the distance from Earth). JPL Horizons. Retrieved 2022-05-29.

http://aquarid.physics.uwo.ca/~pbrown/taus.pdf

External links

tau Herculids as seen by the Global Meteor Network cameras (30 May 2022 Denis Vida)
Radio Meteor Observations (peaking around 4:00 UT 31 May)
Tau Herculids Meteors over Kitt Peak Telescopes (Astronomy Picture of the Day accumulated over 2.5 hours very late on May 30)

v t e Meteor showers
By name	Andromedids Antihelion Source Aquariids eta Aquariids kappa Aquariids North delta Aquariids North iota Aquariids South iota Aquariids Southern Delta Aquariids tau Aquariids Aquilids South June Aquilids Arietids Daytime eps. Arietids Daytime May Arietids Aurigids alpha Aurigids delta Aurigids Nov. iota Aurigids Bootids (June Bootids) Canis-Minorids Cancrids (delta Cancrids) Capricornids alpha Capricornids Daytime Capri.-Sagitt. Carinids (eta Carinids) Cassiopeids (beta Cassiopeids) Centaurids alpha Centaurids theta Centaurids omicron Centaurids Cetids omega Cetids pi Cetids Comae Berenicids Cygnids (kappa Cygnids) Doradids (gamma Doradids) Draconids Eridanids (eta Eridanids) Geminids (epsilon Geminids) Herculids (tau Herculids) Hydrids (sigma Hydrids) Leonids Leonis Minorids (Dec. Leonis Minorids) Lyrids eta Lyrids June Lyrids Monocerotids alpha Monocerotids Normids (gamma Normids) Orionids Pegasids Perseids Daytime zeta Perseids September epsilon Perseids Phoenicids (July Phoenicids) Piscis Austrinids Puppids (pi Puppids) Puppid-Velids Quadrantids Scorpiids alpha Scorpiids North omega Scorpiids South omega Scorpiids Serpentids (kappa Serpentids) Sextantids (Daytime Sextantids) Taurids Daytime beta Taurids Northern Taurids Southern Taurids Ursids Virginids alpha Virginids gamma Virginids eta Virginids theta Virginids iota Virginids lambda Virginids mu Virginids pi Virginids psi Virginids March Virginids
By peak date	January 4 February 8 February 10 March 14 April 17 April 22–23 April 26 May 6 June 7 June 27 July 13 July 28–29 July 30 July 31 – August 1 August 13 September 1 October 8 October 10 October 21 October 22 November 9 November 12 November 18 November 21–22 December 5–6 December 13–14 December 15 December 22
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

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