87 Sylvia

outer main-belt asteroid

Place asteroid Q107673

Facts

33 properties

Identity

Instance of: asteroid

More facts +32

Follows: 86 Semele^[5]
Followed by: 88 Thisbe^[6]
Absolute magnitude: +6.94^[20]
Albedo: +0.043, +0.046
Apoapsis: +3.813239824242936
Apparent magnitude: +12.87^[19]
Argument of periapsis: +265.8265584708386
Asteroid spectral type: P-type asteroid, X-type asteroid^[15]^[16]
Child astronomical body: Romulus, Remus^[10]^[11]
Density: +1.2^[23]
Diameter: +253.051
Discoverer or inventor: N. R. Pogson^[2]
Epoch: November 21, 2025
Longitude of ascending node: +73.01146030211659^[28]
Mass: +14780000000000000000^[24]
Mean anomaly: +94.95962368177054
Minor planet group: asteroid belt, outer asteroid belt^[7]^[8]
Named after: Rhea Silvia^[4]
Orbital eccentricity: +0.09433757215082976^[18]
Orbital inclination: +10.855, +10.87247390226396^[21]^[22]
Orbital period: +2375.81511806563^[26]
Parent astronomical body: Sun^[9]
Periapsis: +3.155797740186711
Provisional designation: A909 GA, A866 KA^[12]^[13]
Rotation period: +5.184^[27]
Semi-major axis of an orbit: +3.484518782214823
Significant event: naming^[17]
Site of astronomical discovery: Madras Observatory^[3]
Surface gravity: +0.0729
Temperature: +151^[25]
Time of discovery or invention: May 16, 1866^[14]
Time of periapsis: +2460373.815251253

🏷️ Also known as

en (87) Sylvia en Sylvia en 87 Sylvia ar 87 سيلفيا de A909 GA el 87 Σύλβια es 87 silvia es Silvia fa سیارک ۸۷ fa سیارک 87 fr (87) Sylvia II Rémus fr (87) Sylvia I Romulus fr Sylvia he 87 סילביה ja シルヴィア ko 87 실비아 nl (87) Sylvia pl Sylvia pt 87 Sílvia pt Sylvia

🔖 Identifiers · 10

Image (Wikimedia Commons): ESO - 87 Sylvia-2 (by).jpg ↗
Bing entity ID: 78781a20-8d0c-6a0f-ffb0-101f77c3433e
DAMIT asteroid ID: 132
Fandom article ID: thesolarsystem:87_Sylvia
Freebase ID: /m/0370sq
JPL Small-Body Database SPK-ID: 20000087
Minor Planet Center body ID: 87
SpaceReference.org celestial object ID: asteroid/87-sylvia-a866-ka
Topic's main category: Category:87 Sylvia
Wolfram Language entity code: Entity["MinorPlanet", "Sylvia"]

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

🔗 Connections

Asteroid spectral type 2

P-type asteroid, X-type asteroid

Child astronomical body 2

Romulus, Remus

← Parent astronomical body 2

Romulus, Remus

Discoverer or inventor 1

N. R. Pogson

Epoch 1

November 21, 2025

Follows 1

86 Semele

Instance of 1

asteroid

Minor planet group 1

asteroid belt

Named after 1

Rhea Silvia

Parent astronomical body 1

Sun

Preceded by (successor) 1

86 Semele

Site of astronomical discovery 1

Madras Observatory

← FactGrid item ID 1

Bousseviller

Press Enter · cited answer in seconds

Summary

87 Sylvia is an asteroid^[1].

References

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

Direct Wikidata claims

[2] ↑ 87 Sylvia — discoverer or inventor (P61): N. R. Pogson. Minor Planet Center database. Retrieved 2024-01-24. ssd.jpl.nasa.gov. Provenance: wikidata.org.
[3] ↑ 87 Sylvia — site of astronomical discovery (P65): Madras Observatory. JPL Small-Body Database. Retrieved 2024-01-24. ssd.jpl.nasa.gov. Provenance: wikidata.org.
[4] ↑ 87 Sylvia — named after (P138): Rhea Silvia. Dictionary of Minor Planet Names (Sixth Revised and Enlarged Edition). wikidata.org.
[5] ↑ 87 Sylvia — follows (P155): 86 Semele. Minor Planet Center database. wikidata.org.
[6] ↑ 87 Sylvia — followed by (P156): 88 Thisbe. Minor Planet Center database. wikidata.org.
[7] ↑ 87 Sylvia — minor planet group (P196): asteroid belt. JPL Small-Body Database. Retrieved 2023-10-16. ssd.jpl.nasa.gov. Provenance: wikidata.org.
[8] ↑ 87 Sylvia — minor planet group (P196): outer asteroid belt. JPL Small-Body Database. Retrieved 2024-01-24. ssd.jpl.nasa.gov. Provenance: wikidata.org.
[9] ↑ 87 Sylvia — parent astronomical body (P397): Sun. wikidata.org.
[10] ↑ 87 Sylvia — child astronomical body (P398): Romulus. wikidata.org.
[11] ↑ 87 Sylvia — child astronomical body (P398): Remus. wikidata.org.
[12] ↑ 87 Sylvia — provisional designation (P490): A909 GA. JPL Small-Body Database. Retrieved 2023-10-16. ssd.jpl.nasa.gov. Provenance: wikidata.org.
[13] ↑ 87 Sylvia — provisional designation (P490): A866 KA. JPL Small-Body Database. Retrieved 2023-10-16. ssd.jpl.nasa.gov. Provenance: wikidata.org.
[14] ↑ 87 Sylvia — time of discovery or invention (P575): May 16, 1866. JPL Small-Body Database. Retrieved 2023-10-16. ssd.jpl.nasa.gov. Provenance: wikidata.org.
[15] ↑ 87 Sylvia — asteroid spectral type (P720): P-type asteroid. JPL Small-Body Database. Retrieved 2023-10-16. ssd.jpl.nasa.gov. Provenance: wikidata.org.
[16] ↑ 87 Sylvia — asteroid spectral type (P720): X-type asteroid. JPL Small-Body Database. Retrieved 2024-01-24. ssd.jpl.nasa.gov. Provenance: wikidata.org.
[17] ↑ 87 Sylvia — significant event (P793): naming. wikidata.org.
[18] ↑ 87 Sylvia — orbital eccentricity (P1096): 0.09433757215082976. JPL Small-Body Database. Retrieved 2025-10-01. ssd.jpl.nasa.gov. Provenance: wikidata.org.
[19] ↑ 87 Sylvia — apparent magnitude (P1215): 12.87. wikidata.org.
[20] ↑ 87 Sylvia — absolute magnitude (P1457): 6.94. JPL Small-Body Database. Retrieved 2025-09-30. ssd.jpl.nasa.gov. Provenance: wikidata.org.
[21] ↑ 87 Sylvia — orbital inclination (P2045): 10.855 degree. wikidata.org.
[22] ↑ 87 Sylvia — orbital inclination (P2045): 10.87247390226396 degree. JPL Small-Body Database. Retrieved 2025-10-01. ssd.jpl.nasa.gov. Provenance: wikidata.org.
[23] ↑ 87 Sylvia — density (P2054): 1.2 gram per cubic centimetre. wikidata.org.
[24] ↑ 87 Sylvia — mass (P2067): 14,780,000,000,000,000,000 kg. JPL Small-Body Database. wikidata.org.
[25] ↑ 87 Sylvia — temperature (P2076): 151 K. wikidata.org.
[26] ↑ 87 Sylvia — orbital period (P2146): 2375.81511806563 day. JPL Small-Body Database. Retrieved 2025-10-01. ssd.jpl.nasa.gov. Provenance: wikidata.org.
[27] ↑ 87 Sylvia — rotation period (P2147): 5.184 hour. JPL Small-Body Database. Retrieved 2023-10-16. ssd.jpl.nasa.gov. Provenance: wikidata.org.
[28] ↑ 87 Sylvia — longitude of ascending node (P2213): 73.01146030211659 degree. JPL Small-Body Database. Retrieved 2025-10-01. ssd.jpl.nasa.gov. Provenance: wikidata.org.

Class ancestry

[1] ↑ 87 Sylvia is an instance of asteroid (Q3863) [P31, primary]. 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). 87 Sylvia. Retrieved November 6, 2026, from https://4ort.xyz/entity/87-sylvia

MLA “87 Sylvia.” 4ort.xyz Knowledge Graph, 4ort.xyz, 6 Nov. 2026, https://4ort.xyz/entity/87-sylvia.

BibTeX

@misc{4ortxyz_87-sylvia_2026, author = {{4ort.xyz Knowledge Graph}}, title = {{87 Sylvia}}, year = {2026}, url = {https://4ort.xyz/entity/87-sylvia}, note = {Accessed: 2026-11-06}}

LLM prompt

According to 4ort.xyz Knowledge Graph (aggregator of Wikidata, Wikipedia, and authoritative open-data sources): 87 Sylvia — https://4ort.xyz/entity/87-sylvia (retrieved 2026-11-06)

Canonical URL: https://4ort.xyz/entity/87-sylvia · Last refreshed: November 6, 2026

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.

23d ago · ~2026-54707-92 · 2026-10-15 view diff on Wikidata ↗

Mass → {'unit': 'Q11570', 'amount': '+14780000000000000000'}

Instance of → —

Orbit diagram → Орбита астероида 87 (наклон).png, Орбита астероида 87.png

Named after → Rhea Silvia

+ 35 other properties edited (see Wikidata diff for full list)

"/* wbsetclaim-create:2||1 */ Orbit diagram: Орбита астероида 87 (наклон).png"

Live feed via Wikidata EventStreams. New edits appear within minutes of being made on Wikidata.