(21857) 1999 TJ154

asteroid

Place asteroid Q5192415

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(21857) 1999 TJ154

Summary

(21857) 1999 TJ154 is an asteroid^[1].

Key Facts

(21857) 1999 TJ154 is credited with the discovery of Lincoln Near-Earth Asteroid Research^[2].
(21857) 1999 TJ154's instance of is recorded as asteroid^[3].
(21857) 1999 TJ154's site of astronomical discovery is recorded as Experimental Test Site^[4].
(21857) 1999 TJ154's follows is recorded as 21856 Heathermaria^[5].
(21857) 1999 TJ154's followed by is recorded as 21858 Gosal^[6].
(21857) 1999 TJ154's minor planet group is recorded as asteroid belt^[7].
(21857) 1999 TJ154's parent astronomical body is recorded as Sun^[8].
(21857) 1999 TJ154's provisional designation is recorded as 1994 TA7^[9].
(21857) 1999 TJ154's provisional designation is recorded as 1999 TJ154^[10].
(21857) 1999 TJ154's time of discovery or invention is recorded as +1999-10-07T00:00:00Z^[11].
(21857) 1999 TJ154's JPL Small-Body Database SPK-ID is recorded as 20021857^[12].
(21857) 1999 TJ154's orbital eccentricity is recorded as {'unit': '1', 'amount': '+0.07'}^[13].
(21857) 1999 TJ154's orbital eccentricity is recorded as {'unit': '1', 'amount': '+0.0692502'}^[14].
(21857) 1999 TJ154's orbital eccentricity is recorded as {'unit': '1', 'amount': '+0.07350899054047971'}^[15].
(21857) 1999 TJ154's absolute magnitude is recorded as {'unit': '1', 'amount': '+13.9'}^[16].
(21857) 1999 TJ154's absolute magnitude is recorded as {'unit': '1', 'amount': '+14.05'}^[17].
(21857) 1999 TJ154's orbital inclination is recorded as {'unit': 'http://www.wikidata.org/entity/Q28390', 'amount': '+2.45621'}^[18].
(21857) 1999 TJ154's orbital inclination is recorded as {'unit': 'http://www.wikidata.org/entity/Q28390', 'amount': '+2.457859669232775'}^[19].
(21857) 1999 TJ154's orbital period is recorded as {'unit': 'http://www.wikidata.org/entity/Q577', 'amount': '+4.82'}^[20].
(21857) 1999 TJ154's orbital period is recorded as {'unit': 'http://www.wikidata.org/entity/Q573', 'amount': '+1757.096718671184'}^[21].
(21857) 1999 TJ154's longitude of ascending node is recorded as {'unit': 'http://www.wikidata.org/entity/Q28390', 'amount': '+152.85547'}^[22].
(21857) 1999 TJ154's longitude of ascending node is recorded as {'unit': 'http://www.wikidata.org/entity/Q28390', 'amount': '+152.7009316881198'}^[23].
(21857) 1999 TJ154's semi-major axis of an orbit is recorded as {'unit': 'http://www.wikidata.org/entity/Q1811', 'amount': '+2.8522767'}^[24].
(21857) 1999 TJ154's semi-major axis of an orbit is recorded as {'unit': 'http://www.wikidata.org/entity/Q1811', 'amount': '+2.849693557552517'}^[25].
(21857) 1999 TJ154's apoapsis is recorded as {'unit': 'http://www.wikidata.org/entity/Q1811', 'amount': '+3.050'}^[26].

Body

Designation and Status

(21857) 1999 TJ154's instance of is recorded as asteroid^[3].

⭐ Popularity Graph

0/100 long tail

Quick Facts

Instance of asteroid

Follows 21856 Heathermaria

Followed by 21858 Gosal

Properties

Absolute magnitude unit: 1, amount: +13.9, unit: 1, amount: +14.05

Albedo unit: 1, amount: +0.248

Apoapsis unit: www.wikidata.org, amount: +3.050, unit: www.wikidata.org, amount: +3.059171654317911

Argument of periapsis unit: www.wikidata.org, amount: +175.40941, unit: www.wikidata.org, amount: +175.5628522361837

Diameter unit: www.wikidata.org, amount: +4.852

Discoverer or inventor Lincoln Near-Earth Asteroid Research

Epoch November 21, 2025

Imported from wholeness_audit_2026-05-02

Longitude of ascending node unit: www.wikidata.org, amount: +152.85547, unit: www.wikidata.org, amount: +152.7009316881198

Mean anomaly unit: www.wikidata.org, amount: +73.88419, unit: www.wikidata.org, amount: +204.8630737077259

Minor planet group asteroid belt

Orbital eccentricity unit: 1, amount: +0.07, unit: 1, amount: +0.0692502, unit: 1, amount: +0.07350899054047971

Orbital inclination unit: www.wikidata.org, amount: +2.45621, unit: www.wikidata.org, amount: +2.457859669232775

Orbital period unit: www.wikidata.org, amount: +4.82, unit: www.wikidata.org, amount: +1757.096718671184

Parent astronomical body Sun

Periapsis unit: www.wikidata.org, amount: +2.6547559, unit: www.wikidata.org, amount: +2.640215460787123

Provisional designation 1994 TA7, 1999 TJ154

Semi-major axis of an orbit unit: www.wikidata.org, amount: +2.8522767, unit: www.wikidata.org, amount: +2.849693557552517

Site of astronomical discovery Experimental Test Site

Time of discovery or invention October 7, 1999

Time of periapsis unit: www.wikidata.org, amount: +2461757.6960670357

External References (4)

Google knowledge graph id /g/11g236dqqq

Jpl small-body database spk-id 20021857

Minor planet center body id 21857

Wolfram language entity code Entity["MinorPlanet", "MinorPlanet21857Provisional1999TJ154"]

🌐 Available in 4 languages

ar(21857) 1999 TJ154 arz(21857) 1999 TJ154 (كويكب) fr(21857) 1999 TJ154 pt(21857) 1999 TJ154

References

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

Direct Wikidata claims

[3] ↑ (21857) 1999 TJ154 — instance of (P31): asteroid. JPL Small-Body Database. Retrieved 2024-03-22. ssd.jpl.nasa.gov. Provenance: wikidata.org.
[2] ↑ (21857) 1999 TJ154 — discoverer or inventor (P61): Lincoln Near-Earth Asteroid Research. JPL Small-Body Database. Retrieved 2024-03-22. ssd.jpl.nasa.gov. Provenance: wikidata.org.
[4] ↑ (21857) 1999 TJ154 — site of astronomical discovery (P65): Experimental Test Site. JPL Small-Body Database. Retrieved 2024-05-02. ssd.jpl.nasa.gov. Provenance: wikidata.org.
[5] ↑ (21857) 1999 TJ154 — follows (P155): 21856 Heathermaria. wikidata.org.
[6] ↑ (21857) 1999 TJ154 — followed by (P156): 21858 Gosal. wikidata.org.
[7] ↑ (21857) 1999 TJ154 — minor planet group (P196): asteroid belt. JPL Small-Body Database. Retrieved 2024-03-22. ssd.jpl.nasa.gov. Provenance: wikidata.org.
[8] ↑ (21857) 1999 TJ154 — parent astronomical body (P397): Sun. wikidata.org.
[9] ↑ (21857) 1999 TJ154 — provisional designation (P490): 1994 TA7. JPL Small-Body Database. Retrieved 2024-03-22. ssd.jpl.nasa.gov. Provenance: wikidata.org.
[10] ↑ (21857) 1999 TJ154 — provisional designation (P490): 1999 TJ154. JPL Small-Body Database. Retrieved 2024-03-22. ssd.jpl.nasa.gov. Provenance: wikidata.org.
[11] ↑ (21857) 1999 TJ154 — time of discovery or invention (P575): +1999-10-07T00:00:00Z. JPL Small-Body Database. Retrieved 2024-03-22. ssd.jpl.nasa.gov. Provenance: wikidata.org.
[12] ↑ (21857) 1999 TJ154 — JPL Small-Body Database SPK-ID (P716): 20021857. JPL Small-Body Database. Retrieved 2024-03-22. wikidata.org.
[13] ↑ (21857) 1999 TJ154 — orbital eccentricity (P1096): {'unit': '1', 'amount': '+0.07'}. wikidata.org.
[14] ↑ (21857) 1999 TJ154 — orbital eccentricity (P1096): {'unit': '1', 'amount': '+0.0692502'}. minorplanetcenter.net. minorplanetcenter.net. Provenance: wikidata.org.
[15] ↑ (21857) 1999 TJ154 — orbital eccentricity (P1096): {'unit': '1', 'amount': '+0.07350899054047971'}. JPL Small-Body Database. Retrieved 2025-12-24. ssd.jpl.nasa.gov. Provenance: wikidata.org.
[16] ↑ (21857) 1999 TJ154 — absolute magnitude (P1457): {'unit': '1', 'amount': '+13.9'}. minorplanetcenter.net. minorplanetcenter.net. Provenance: wikidata.org.
[17] ↑ (21857) 1999 TJ154 — absolute magnitude (P1457): {'unit': '1', 'amount': '+14.05'}. JPL Small-Body Database. Retrieved 2025-12-24. ssd.jpl.nasa.gov. Provenance: wikidata.org.
[18] ↑ (21857) 1999 TJ154 — orbital inclination (P2045): {'unit': 'http://www.wikidata.org/entity/Q28390', 'amount': '+2.45621'}. minorplanetcenter.net. minorplanetcenter.net. Provenance: wikidata.org.
[19] ↑ (21857) 1999 TJ154 — orbital inclination (P2045): {'unit': 'http://www.wikidata.org/entity/Q28390', 'amount': '+2.457859669232775'}. JPL Small-Body Database. Retrieved 2025-12-24. ssd.jpl.nasa.gov. Provenance: wikidata.org.
[20] ↑ (21857) 1999 TJ154 — orbital period (P2146): {'unit': 'http://www.wikidata.org/entity/Q577', 'amount': '+4.82'}. minorplanetcenter.net. minorplanetcenter.net. Provenance: wikidata.org.
[21] ↑ (21857) 1999 TJ154 — orbital period (P2146): {'unit': 'http://www.wikidata.org/entity/Q573', 'amount': '+1757.096718671184'}. JPL Small-Body Database. Retrieved 2025-12-24. ssd.jpl.nasa.gov. Provenance: wikidata.org.
[22] ↑ (21857) 1999 TJ154 — longitude of ascending node (P2213): {'unit': 'http://www.wikidata.org/entity/Q28390', 'amount': '+152.85547'}. minorplanetcenter.net. minorplanetcenter.net. Provenance: wikidata.org.
[23] ↑ (21857) 1999 TJ154 — longitude of ascending node (P2213): {'unit': 'http://www.wikidata.org/entity/Q28390', 'amount': '+152.7009316881198'}. JPL Small-Body Database. Retrieved 2025-12-24. ssd.jpl.nasa.gov. Provenance: wikidata.org.
[24] ↑ (21857) 1999 TJ154 — semi-major axis of an orbit (P2233): {'unit': 'http://www.wikidata.org/entity/Q1811', 'amount': '+2.8522767'}. minorplanetcenter.net. minorplanetcenter.net. Provenance: wikidata.org.
[25] ↑ (21857) 1999 TJ154 — semi-major axis of an orbit (P2233): {'unit': 'http://www.wikidata.org/entity/Q1811', 'amount': '+2.849693557552517'}. JPL Small-Body Database. Retrieved 2025-12-24. ssd.jpl.nasa.gov. Provenance: wikidata.org.
[26] ↑ (21857) 1999 TJ154 — apoapsis (P2243): {'unit': 'http://www.wikidata.org/entity/Q1811', 'amount': '+3.050'}. minorplanetcenter.net. minorplanetcenter.net. Provenance: wikidata.org.

Class ancestry

[1] ↑ (21857) 1999 TJ154 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). (21857) 1999 TJ154. Retrieved May 3, 2026, from https://4ort.xyz/entity/-21857-1999-tj154

MLA “(21857) 1999 TJ154.” 4ort.xyz Knowledge Graph, 4ort.xyz, 3 May. 2026, https://4ort.xyz/entity/-21857-1999-tj154.

BibTeX

@misc{4ortxyz_-21857-1999-tj154_2026, author = {{4ort.xyz Knowledge Graph}}, title = {{(21857) 1999 TJ154}}, year = {2026}, url = {https://4ort.xyz/entity/-21857-1999-tj154}, note = {Accessed: 2026-05-03}}

LLM prompt

According to 4ort.xyz Knowledge Graph (aggregator of Wikidata, Wikipedia, and authoritative open-data sources): (21857) 1999 TJ154 — https://4ort.xyz/entity/-21857-1999-tj154 (retrieved 2026-05-03)

Canonical URL: https://4ort.xyz/entity/-21857-1999-tj154 · Last refreshed: May 3, 2026