NASA SBDB Horizons Data · Astrophyzix Scientific Close‑Approach Report
Asteroid 2026 JH2 — Pre‑Close Approach Analysis · 16 May 2026 - (Image: Astrophyzix Orbital Viewer)
Key Takeaways of Asteroid 2026 JH2
- NASA JPL Solution: 2026-May-16 06:48:56 | SPK-ID 54629847
- Closest pass: 18 May 2026 at 21:23 UTC — 0.24 LD (~91,500 km), well inside GEO but with No current risk of impact reported.
- Size estimate: H = 27.3 → ~9–20 m diameter (albedo‑dependent), below radar detectability.
- Orbit class: Apollo NEO — highly eccentric (e = 0.582), period 3.76 years.
- Uncertainty: Condition code 7 from a 5‑day arc; short‑warning discovery (8 days).
- Risk context: Not a PHA; too small for hazard classification.
- Ignore clickbait, sensational videos and news reports which claim that "there is a big rock about to hit us" — that's simply not true. Follow the evidence, not the entertainment.
Scientific Consensus Snapshot of 2026 JH2
| Parameter | Status |
|---|---|
| Closest approach | 2026‑05‑18 21:23 UTC at 0.000611 AU |
| Nominal miss distance | 0.238 LD / 91,500 km |
| Largest uncertainty | Condition code 7 (47 obs, 5‑day arc) |
| PHA status | No (H > 22) |
| Hazard level | Non‑hazardous size; no impact geometry |
2026 JH2 Close‑Approach Overview
| Object | Class | PHA | Approach date | Miss (LD) | Miss (km) | Miss (AU) | Velocity (km/s) | Diameter (m) |
|---|---|---|---|---|---|---|---|---|
| 2026 JH2 | APO | No | 2026‑05‑18 | 0.238 | 91,500 | 0.000611 | 9.21 | 9–20 |
1. Asteroid 2026 JH2
Asteroid 2026 JH2 Encounter Geometry
| Parameter | Value |
|---|---|
| Approach date | 2026‑05‑18 21:23 UTC ±3 min |
| Miss distance | 0.238 LD — 91,500 km — 0.000611 AU |
| Relative velocity | 9.21 km/s |
| Orbit class | Apollo (APO) |
| Earth MOID | 0.00073 AU |
| Orbital period | 1,373 days (3.76 yr) |
Physical Characteristics of NEO 2026 JH2
| Parameter | Value |
|---|---|
| Diameter range | 9–20 m (albedo 0.25–0.05) |
| Absolute magnitude (H) | 27.3 |
| Rotation period | Unknown (no lightcurve) |
| Spectral type | Unknown (assumed S‑type) |
| PHA classification | No |
| Condition code | 7 |
Official Data Source — JPL SBDB:
https://ssd.jpl.nasa.gov/tools/sbdb_lookup.html#/?sstr=2026%20JH2
Astrophyzix Digital Observatory Interpretation and FAQ & Answers
1. What does the close‑approach distance tell us?
At 0.24 LD, JH2 passes inside the geostationary belt but remains ~14 Earth radii away. This is “close” astronomically, not dynamically. No gravitational keyhole exists at this geometry.
2. Why the size range?
Diameter is inferred from brightness (H). Without a measured albedo, the 9–20 m range brackets typical stony (0.25) to dark carbonaceous (0.05) surfaces.
3. Why did Astrophyzix see Asteroid 2026 JH2 before it showed up via the NeoWs API?
JH2 appeared in JPL’s CAD and Scout within hours of discovery, but the public NeoWs API lags 24–48 hours for new designations. Astrophyzix has several N-body engines which queries Horizons directly, bypassing the cache for timely, current and reliable data.
4. Will Asteroid 2026 JH2 be visible?
Yes — peaks at magnitude ~11.5 on 18 May, moving 3.5°/hour across southern constellations. The Virtual Telescope Project will stream it live from 20:30 UTC.
5. What happens next?
Post‑flyby astrometry (19–25 May) will reduce the condition code. The refined orbit will clarify its next return in 2029–2030.
Astrophyzix will publish an update once MPC incorporates new data.
Track live: Astrophyzix Live Orbital Viewer
Risk Assessment
No impact threat reported. 2026 JH2’s trajectory does not intersect Earth, and its nominal miss distance is large in dynamical terms despite being “close” astronomically.
Not a PHA. Its absolute magnitude (H = 27.3) places it far below the size threshold for Potentially Hazardous Asteroids. Objects under ~140 m are not classified as PHAs.
Short‑arc uncertainty. The condition code of 7 reflects a 5‑day observation arc. This is normal for newly discovered small NEOs. Post‑flyby astrometry will reduce uncertainty significantly.
Energy regime. At ~15 m average diameter, JH2 is below the Chelyabinsk scale and well below the Tunguska regime. Even in a hypothetical impact scenario, it would not pose a regional hazard.
Operational context. Passing inside GEO does not endanger satellites — the object’s inclination, geometry, and altitude differ completely from operational orbits.
Astrophyzix Digital Observatory Scientific Summary
Asteroid 2026 JH2 represents a textbook example of a small, short‑arc Apollo NEO making an extremely close but dynamically unremarkable flyby of Earth. Its 0.24 LD miss distance places it well inside the geostationary belt, yet its trajectory remains fully detached from any gravitational keyholes or impact corridors. Despite the dramatic proximity in astronomical terms, the encounter is classified as routine by planetary‑defence standards.
With an absolute magnitude H = 27.3, JH2 is a sub‑20‑metre object, far below the size threshold for Potentially Hazardous Asteroids. Its physical scale places it beneath the Chelyabinsk energy regime, and its low mass ensures negligible gravitational interaction with Earth.
The orbit — a high‑eccentricity Apollo with a 3.76‑year period — is typical of small inner‑Solar‑System NEOs.
The condition code of 7 reflects the short 5‑day observation arc and is expected to drop rapidly once post‑encounter astrometry is incorporated. This behaviour is normal for objects of this size and discovery cadence.
From a scientific standpoint, JH2 is valuable as a survey‑performance benchmark: a small, faint, fast‑moving NEO detected only days before a close pass. Its appearance in Scout and CAD before NeoWs highlights the latency differences between NASA’s public and internal pipelines, and demonstrates the utility of the Astrophyzix direct‑Horizons querying architecture.
Overall, 2026 JH2 is a safe, well‑characterised, and scientifically routine close approach. Its primary value lies in orbit refinement, survey calibration, and public education — not in hazard assessment. The object will be re‑evaluated after its 2026 flyby, with its next dynamical window expected in the 2029–2030 timeframe.