Jump to content
 







Main menu
   


Navigation  



Main page
Contents
Current events
Random article
About Wikipedia
Contact us
Donate
 




Contribute  



Help
Learn to edit
Community portal
Recent changes
Upload file
 








Search  

































Create account

Log in
 









Create account
 Log in
 




Pages for logged out editors learn more  



Contributions
Talk
 



















Contents

   



(Top)
 


1 Description  



1.1  Close approaches  







2 Physical characteristics  





3 PalomarLeiden survey  





4 Numbering and naming  





5 References  





6 External links  














6344 P-L






Español
Français
Bahasa Indonesia
Minangkabau

Sunda
Svenska

 

Edit links
 









Article
Talk
 

















Read
Edit
View history
 








Tools
   


Actions  



Read
Edit
View history
 




General  



What links here
Related changes
Upload file
Special pages
Permanent link
Page information
Cite this page
Get shortened URL
Download QR code
Wikidata item
 




Print/export  



Download as PDF
Printable version
 
















Appearance
   

 






From Wikipedia, the free encyclopedia
 


6344 P-L
Discovery [1][2]
Discovered byC. J. van Houten
I. van Houten-G.
T. Gehrels
Discovery sitePalomar Obs.
Discovery date24 September 1960
Designations

MPC designation

6344 P-L

Alternative designations

2007 RR9

Minor planet category

Apollo · NEO · PHA[1][2]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc47.36 yr (17,298 days)
Aphelion4.6754 AU
Perihelion0.9332 AU

Semi-major axis

2.8043 AU
Eccentricity0.6672

Orbital period (sidereal)

4.70 yr (1,715 days)

Mean anomaly

31.506°

Mean motion

0° 12m 35.64s / day
Inclination4.7249°

Longitude of ascending node

183.57°

Argument of perihelion

234.13°
Earth MOID0.0286 AU (11.1 LD)
Physical characteristics

Mean diameter

250 m (generic at 0.20)[3]
460 m (generic at 0.06)[3]

Absolute magnitude (H)

20.4[1]

6344 P-L is an unnumbered, sub-kilometer asteroid and suspected dormant comet, classified as near-Earth object and potentially hazardous asteroid of the Apollo group that was first observed on 24 September 1960, by astronomers and asteroid searchers Tom Gehrels, Ingrid van Houten-Groeneveld, and Cornelis Johannes van Houten during the Palomar–Leiden surveyatPalomar Observatory.[2]

Description[edit]

Since 6344 P-L is still unnumbered, the discoverers have not yet been officially determined. Last seen in 1960, it was lost, but rediscovered in 2007 as 2007 RR9.[4] In other words, it was a lost asteroid from 1960 until it was recovered and recognized as the same object by Peter Jenniskens in 2007.[5] It was again observed from 19 July 2021 to 4 August 2021 by Astronomical Research Observatory, Westfield, and Calar Alto-Schmidt (see Minor Planet Center MPS 1525704).

It is either an asteroid or dormant comet nucleus, and it has a 4.7-year orbit around the Sun.[5] The orbit goes out as far as Jupiter's but then back in, passing as close as 0.07 AU to the Earth, making it a collision risk.[5]

Close approaches[edit]

The minor planet classifies as a potentially hazardous object with an Earth minimum orbit intersection distance of 0.0286 AU (4,280,000 km), equivalent to 11.1 lunar distances.[1] Although it was not outgassing at the time of its recovery, its orbit indicates that it is probably a dormant comet.[5]

Physical characteristics[edit]

Based on a generic magnitude-to-diameter conversion, 6344 P-L measures between 250 and 460 meters for an assumed albedo between 0.20 and 0.06.[3] As of 2018, no rotational lightcurve has been obtained. The body's rotation period, shape and pole remains unknown.[1][6]

Palomar–Leiden survey[edit]

The survey designation "P-L" stands for Palomar–Leiden, named after Palomar Observatory and Leiden Observatory, which collaborated on the fruitful Palomar–Leiden survey in the 1960s. Tom Gehrels used Palomar's 48-inch Samuel Oschin telescope and shipped the photographic plates to the van Houten's at Leiden Observatory, where astrometry was carried out. The trio are credited with more than 4600 minor planet discoveries.[7]

Numbering and naming[edit]

As of 2021, this minor planet has neither been numbered nor named and still remains provisionally designated (see list of unnumbered minor planets).

References[edit]

  1. ^ a b c d e f "JPL Small-Body Database Browser: (6344 P-L)" (2008-02-03 last obs.). Jet Propulsion Laboratory. Retrieved 23 January 2018.
  • ^ a b c "6344 P-L". Minor Planet Center. Retrieved 23 January 2018.
  • ^ a b c "Asteroid Size Estimator". CNEOS NASA/JPL. Retrieved 12 November 2017.
  • ^ Mohit Joshi (10 May 2007). "Long-lost 'Potentially Hazardous Asteroid' re-located". TopNews. Retrieved 20 August 2016.
  • ^ a b c d "Long-Lost, Dangerous Asteroid Is Found Again". ScienceDaily. 15 October 2007. Retrieved 1 June 2016.
  • ^ "LCDB Data for (6344)". Asteroid Lightcurve Database (LCDB). Retrieved 23 January 2018.
  • ^ "Minor Planet Discoverers". Minor Planet Center. 6 December 2017. Retrieved 23 January 2018.
  • External links[edit]


    Retrieved from "https://en.wikipedia.org/w/index.php?title=6344_P-L&oldid=1196885230"

    Categories: 
    Apollo asteroids
    Minor planet object articles (unnumbered)
    Discoveries by Tom Gehrels
    Discoveries by Ingrid van Houten-Groeneveld
    Discoveries by Cornelis Johannes van Houten
    Discoveries by the PalomarLeiden survey
    Extinct comets
    Potentially hazardous asteroids
    Astronomical objects discovered in 1960
    Hidden categories: 
    Use dmy dates from February 2018
    JPL Small-Body Database ID different from Wikidata
    Articles with JPL SBDB identifiers
    Articles with MPC identifiers
     



    This page was last edited on 18 January 2024, at 19:55 (UTC).

    Text is available under the Creative Commons Attribution-ShareAlike License 4.0; additional terms may apply. By using this site, you agree to the Terms of Use and Privacy Policy. Wikipedia® is a registered trademark of the Wikimedia Foundation, Inc., a non-profit organization.



    Privacy policy

    About Wikipedia

    Disclaimers

    Contact Wikipedia

    Code of Conduct

    Developers

    Statistics

    Cookie statement

    Mobile view



    Wikimedia Foundation
    Powered by MediaWiki