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1999 XU4

asteroid
Thing Asteroid Q15191719

Facts

21 properties
Instance of
asteroid
Follows
1995 WP32[3]
Followed by
(77262) 2001 FS49[4]
Absolute magnitude
15.46[11]
Apoapsis
2.782820767052653 au[16]
Argument of periapsis
299.9032272329839°[18]
Discoverer or inventor
Lincoln Near-Earth Asteroid Research[1]
Epoch
November 21, 2025[20]
Longitude of ascending node
219.9882749949737°[14]
Mean anomaly
47.36130893989385°[19]
Minor planet group
asteroid belt[5]
Orbital eccentricity
0.09094243328723618[10]
Orbital inclination
5.32891714591103°[12]
Orbital period
1,488.070573979967 day[13]
Parent astronomical body
Sun[6]
Periapsis
2.318861378846532 au[17]
Provisional designation
2001 FR49, 1999 XU4[7][8]
Semi-major axis of an orbit
2.550841072949593 au[15]
Site of astronomical discovery
Experimental Test Site[2]
Time of discovery or invention
March 18, 2001[9]
Time of periapsis
2,460,804.7306383927 Julian day[21]
🏷️ Also known as
ru 1999 XU4 ru 2001 FR49 zh 小行星77261
🔖 Identifiers · 2
JPL Small-Body Database SPK-ID
20077261
Minor Planet Center body ID
77261

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References

Programmatic citations — every numbered marker resolves to a verifiable graph row below.

Direct Wikidata claims

  1. [1] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  2. [2] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  3. [3] ↑ . wikidata.org.
  4. [4] ↑ . wikidata.org.
  5. [5] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  6. [6] ↑ . wikidata.org.
  7. [7] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  8. [8] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  9. [9] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  10. [10] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  11. [11] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  12. [12] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  13. [13] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  14. [14] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  15. [15] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  16. [16] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  17. [17] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  18. [18] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  19. [19] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  20. [20] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  21. [21] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.

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Use these citations when quoting this entity in research, articles, AI prompts, or wherever provenance matters. We aggregate Wikidata + Wikipedia + authoritative open-data sources; the stitched, scored, cross-referenced view is what 4ort.xyz contributes.

APA 4ort.xyz Knowledge Graph. (2026). 1999 XU4. Retrieved October 29, 2026, from https://4ort.xyz/entity/q15191719
MLA “1999 XU4.” 4ort.xyz Knowledge Graph, 4ort.xyz, 29 Oct. 2026, https://4ort.xyz/entity/q15191719.
BibTeX @misc{4ortxyz_q15191719_2026, author = {{4ort.xyz Knowledge Graph}}, title = {{1999 XU4}}, year = {2026}, url = {https://4ort.xyz/entity/q15191719}, note = {Accessed: 2026-10-29}}
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Edit History

Rolling log of changes to this entity's Wikidata record. Values shown reflect the current state of each edited property — follow the history link to see the precise diff for any edit.

  1. 22w ago · LiMrBot bot · 2026-06-07 view diff on Wikidata ↗
    Absolute magnitude → 15.46
    Apoapsis → 2.782821 astronomical unit
    Semi-major axis of an orbit → 2.550841 astronomical unit
    Parent astronomical body → Sun
    + 20 other properties edited (see Wikidata diff for full list)
    "Removed claim: Absolute magnitude: 15.47"
Live feed via Wikidata EventStreams. New edits appear within minutes of being made on Wikidata.