Investigation of Relationships between Known Meteor Streams and Recently Recovered NEOs

Details Investigation of Relationships between Known Meteor Streams and Recently Recovered NEOs Investigation of Relationships between Known Meteor Streams and Recently Recovered NEOs

Sep 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009dps....41.4308m&link_type=abstract

American Astronomical Society, DPS meeting #41, #43.08

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Scientific paper

In the past few years we recovered many single-opposition NEOs. A few of these objects are thought to be associated with known meteor streams, but the linkage is often unconfirmed because of a lack of precise orbital information on the parent object.
The addition of a second opposition to the observed orbital arc greatly improves the predictability of their past motion, allowing us to back-integrate their orbital evolution long enough to extract meaningful predictions of associated meteoric activity.
In this work we will present the results of this type of analysis on a few of these objects.
The most interesting case is probably the recently recovered 2001 HA4, tentatively associated by Peter Jenniskens with the annual stream known as ω-Piscids (OPC, IAU code #217). The present radiant of the stream does not match the asteroidal orbit very well, with a declination discrepancy close to 20 degrees. With our integration we tested if old particles released in the past could match the present radiant: the discrepancy cannot be reduced by more than a few degrees, also assuming unreasonably large ejection velocities and radiation pressure effects.
We also investigated the possibility of a different stream at the other node, and we found a reasonable match with the Daytime q-Pegasids (QPE, IAU code #130).
Another object recovered by our team is 1997 QK1, proposed by Jenniskens as parent for the July Centaurids (JCE, IAU code #179). We checked if a compact meteor cloud associated with the object could have hit the Earth in 1896, explaining a short lived outburst observed that year from Sydney. The outburst radiant could be matched only by old and dispersed particle clouds, but not with compact recently ejected material.
Acknowledgement: our observations were funded by grant AST 0709500 from the U.S. National Science Foundation.

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