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6645 Arcetri

asteroid
Thing asteroid Q653315

Facts

25 properties
Instance of
asteroid
Follows
6644 Jugaku[4]
Followed by
6646 Churanta[5]
Absolute magnitude
+12.9, +13.03[17][18]
Albedo
+0.125[36]
Apoapsis
+3.756, +3.754408040143533[27][28]
Argument of periapsis
+29.95990, +28.98359588138368[31][32]
Diameter
+11.894[35]
Discoverer or inventor
Eleanor F. Helin[1]
Epoch
November 21, 2025[37]
Longitude of ascending node
+24.65545, +24.64306266955906[23][24]
Mean anomaly
+61.93291, +130.0518761234005[33][34]
Minor planet group
asteroid belt[6]
Named after
Arcetri Observatory[3]
Orbital eccentricity
0.2 (0.2–0.2, n=3)[14][15][16]
Orbital inclination
+0.78874, +0.785870563137731[19][20]
Orbital period
+5.54, +2023.166333124145[21][22]
Parent astronomical body
Sun[7]
Periapsis
+2.5051717, +2.506713063210403[29][30]
Provisional designation
1978 QJ1, 1978 SR3, 1984 UC3, 1991 AR1[8][9][10][11]
Semi-major axis of an orbit
+3.1305564, +3.130560551676968[25][26]
Significant event
naming[13]
Site of astronomical discovery
Palomar Observatory[2]
Time of discovery or invention
January 11, 1991[12]
Show all 25 facts +1
Time of periapsis
+2460269.620618521[38]
🏷️ Also known as
en Arcetri de (6645) Arcetri de 1991 AR1 fa سیارک ۶۶۴۵ ru 1978 SR3 ru 1978 QJ1 ru 1984 UC3 ru (6645) 1991 AR1 uk 6645 Арсетрі zh 小行星6645
🔖 Identifiers · 3
Freebase ID
/m/03y0tly
JPL Small-Body Database SPK-ID
20006645
Minor Planet Center body ID
6645

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References

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

Direct Wikidata claims

  1. [1] ↑ . Minor Planet Center 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] ↑ . Minor Planet Center database. wikidata.org.
  5. [5] ↑ . Minor Planet Center database. wikidata.org.
  6. [6] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  7. [7] ↑ . 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] ↑ . wikidata.org.
  14. [14] ↑ . wikidata.org.
  15. [15] ↑ . minorplanetcenter.net. minorplanetcenter.net. Provenance: wikidata.org.
  16. [16] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  17. [17] ↑ . minorplanetcenter.net. minorplanetcenter.net. Provenance: wikidata.org.
  18. [18] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  19. [19] ↑ . minorplanetcenter.net. minorplanetcenter.net. Provenance: wikidata.org.
  20. [20] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  21. [21] ↑ . minorplanetcenter.net. minorplanetcenter.net. Provenance: wikidata.org.
  22. [22] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  23. [23] ↑ . minorplanetcenter.net. minorplanetcenter.net. Provenance: wikidata.org.
  24. [24] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  25. [25] ↑ . minorplanetcenter.net. minorplanetcenter.net. Provenance: wikidata.org.
  26. [26] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  27. [27] ↑ . minorplanetcenter.net. minorplanetcenter.net. Provenance: wikidata.org.
  28. [28] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  29. [29] ↑ . minorplanetcenter.net. minorplanetcenter.net. Provenance: wikidata.org.
  30. [30] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  31. [31] ↑ . minorplanetcenter.net. minorplanetcenter.net. Provenance: wikidata.org.
  32. [32] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  33. [33] ↑ . minorplanetcenter.net. minorplanetcenter.net. Provenance: wikidata.org.
  34. [34] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  35. [35] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  36. [36] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  37. [37] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  38. [38] ↑ . 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). 6645 Arcetri. Retrieved November 1, 2026, from https://4ort.xyz/entity/6645-arcetri
MLA “6645 Arcetri.” 4ort.xyz Knowledge Graph, 4ort.xyz, 1 Nov. 2026, https://4ort.xyz/entity/6645-arcetri.
BibTeX @misc{4ortxyz_6645-arcetri_2026, author = {{4ort.xyz Knowledge Graph}}, title = {{6645 Arcetri}}, year = {2026}, url = {https://4ort.xyz/entity/6645-arcetri}, note = {Accessed: 2026-11-01}}
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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. 4d ago · AbzalM · 2026-10-31 view diff on Wikidata ↗
    Periapsis → {'unit': 'Q1811', 'amount': '+2.5051717'}, {'unit': 'Q1811', 'amount': '+2.506713063210403'}
    Orbital period → {'unit': 'Q577', 'amount': '+5.54'}, {'unit': 'Q573', 'amount': '+2023.166333124145'}
    Wikipedia languages → ['arz', 'ce', 'de', 'en', 'eo', 'es', 'fa', 'fi', 'fr', 'hu', 'hy', 'it', 'kaa',
    Instance of → asteroid
    + 29 other properties edited (see Wikidata diff for full list)
    "/* wbeditentity-update-languages-and-other-short:0||kaa */ kaawiki sitelink"
Live feed via Wikidata EventStreams. New edits appear within minutes of being made on Wikidata.