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128 Nemesis

main-belt asteroid
Place asteroid Q137541
128 Nemesis
NASA/JPL · Public Domain · Wikimedia

Facts

28 properties
Instance of
asteroid
Follows
127 Johanna[5]
Followed by
129 Antigone[6]
Absolute magnitude
7.67[15]
Albedo
0.05, 0.067
Apoapsis
3.099237270933
Argument of periapsis
302.8129137024323
Asteroid spectral type
C-type asteroid[12]
Diameter
162.515
Different from
Nemesis[16]
Discoverer or inventor
James Craig Watson[2]
Epoch
November 21, 2025
Longitude of ascending node
76.16029676552017
Mean anomaly
231.8896520770643
Minor planet group
asteroid belt[7]
Named after
Nemesis[4]
Orbital eccentricity
0.1270063895583919[14]
Orbital inclination
6.254, 6.246829388245652[17][18]
Orbital period
1665.678187935098[19]
Parent astronomical body
Sun[8]
Periapsis
2.400708957672519
Provisional designation
1952 HW1, A872 WA[9][10]
Rotation period
38.9325[20]
Semi-major axis of an orbit
2.74997311430276
Show all 28 facts +4
Significant event
naming[13]
Site of astronomical discovery
Detroit Observatory[3]
Time of discovery or invention
November 25, 1872[11]
Time of periapsis
2461593.251700511
🏷️ Also known as
en 128 Nemesis en (128) 1952 HW1 en (128) Nemesis en Nemesis de 128 Némésis el 128 Νέμεσις fa سیارک ۱۲۸ fr (128) 1952 HW1 fr (128) Némésis fr 128 Némésis fr Némésis ja 128 ネメシス ja ネメシス ko 네메시스 pt (128) Nemesis pt (128) 1952 HW1 pt 128 Nêmesis ru (128) Nemesis ru (128) Немезида ru 1952 HW1
🔖 Identifiers · 4
Freebase ID
/m/037f42
JPL Small-Body Database SPK-ID
20000128
Minor Planet Center body ID
128
Wolfram Language entity code
Entity["MinorPlanet", "Nemesis"]

Report an error or request removal Lineage (PROV-JSON)

🔗 Connections
Asteroid spectral type 1
C-type asteroid
Different from 1
Nemesis
Discoverer or inventor 1
James Craig Watson
Epoch 1
November 21, 2025
Followed by 1
129 Antigone
Followed by (predecessor) 1
129 Antigone
Follows 1
127 Johanna
Instance of 1
asteroid
Minor planet group 1
asteroid belt
Named after 1
Nemesis
Named after 1
Nemesis family
Parent astronomical body 1
Sun
Preceded by (successor) 1
127 Johanna
Site of astronomical discovery 1
Detroit Observatory
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Summary

128 Nemesis is an asteroid[1].

Body

Cultural Significance

Things named for 128 Nemesis include Nemesis family[21], an asteroid family[22].

Why It Matters

Entities named for it include Nemesis family[21], an asteroid family[22].

Related Entities

James Craig Watson

References

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

Direct Wikidata claims

  1. [2] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  2. [3] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  3. [4] ↑ . Dictionary of Minor Planet Names (Sixth Revised and Enlarged Edition). wikidata.org.
  4. [5] ↑ . Minor Planet Center database. wikidata.org.
  5. [6] ↑ . Minor Planet Center database. wikidata.org.
  6. [7] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  7. [8] ↑ . wikidata.org.
  8. [9] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  9. [10] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  10. [11] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  11. [12] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  12. [13] ↑ . wikidata.org.
  13. [14] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  14. [15] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  15. [16] ↑ . wikidata.org.
  16. [17] ↑ . wikidata.org.
  17. [18] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  18. [19] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.
  19. [20] ↑ . JPL Small-Body Database. Retrieved . ssd.jpl.nasa.gov. Provenance: wikidata.org.

Inverse relationships (entities pointing at this one)

  1. [21] ↑ . wikidata.org. → on this site

Inline context (facts about related entities)

  1. [22] ↑ . Wikidata. wikidata.org. → on this site

Class ancestry

  1. [1] ↑ . Wikidata. wikidata.org.

📑 Cite this page

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). 128 Nemesis. Retrieved November 5, 2026, from https://4ort.xyz/entity/128-nemesis
MLA “128 Nemesis.” 4ort.xyz Knowledge Graph, 4ort.xyz, 5 Nov. 2026, https://4ort.xyz/entity/128-nemesis.
BibTeX @misc{4ortxyz_128-nemesis_2026, author = {{4ort.xyz Knowledge Graph}}, title = {{128 Nemesis}}, year = {2026}, url = {https://4ort.xyz/entity/128-nemesis}, note = {Accessed: 2026-11-05}}
LLM prompt According to 4ort.xyz Knowledge Graph (aggregator of Wikidata, Wikipedia, and authoritative open-data sources): 128 Nemesis — https://4ort.xyz/entity/128-nemesis (retrieved 2026-11-05)

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