Latest Asteroid News: Asteroid 2026 TB3

PHA and NEO Asteroid Close Approach Report 07 October 2026

Asteroid Object Bulletin · JPL SBDB & Close Approach Data · TDB

Near-Earth Object (NEO) Close-Approach Report: Asteroid 2026 TB3, October 7, 2026

Single-object report for asteroid 2026 TB (SPK-ID: 354660664) , compiled from the JPL Small-Body Database (orbit solution JPL 1) and JPL Close Approach Data, with size and risk fields derived by the Astrophyzix tracker. This bulletin is a catalogue report, not a live CNEOS CAD/Scout dataset. Track live using the Multi-watch CAD/Scout/Sentry Console.
(Image: Copyright © 2026 Astrophyzix 3D Orbital Viewer and Refinement System.)

On October 7, 2026 (UTC), JPL data resolve a close approach by 2026 TB3, an Apollo-class near-Earth asteroid roughly 7 m across. It passes Earth on 9 October 2026 at about 04:50 TDB (≈ 04:49 UTC), at approximately 1.675 lunar distances (643,858 km) with a relative velocity near 11.0 km/s. JPL also lists a pass of the Moon about eight hours later. No listed approach is on an impacting trajectory. (see full daily report)

Closest catalogued approach to Earth

2026 TB3 (SPK-ID: 54660664)

1.675 LD

643,858 km · 0.004304 au · v_rel 11.04 km/s

EARTH SURFACE19.5 LD (FILTER EDGE)

Encounter (TDB)

2026-Oct-09 04:50 ± 00:39

Est. diameter

0.007 km (H-derived)

Diameter range

0.005 – 0.012 km

Earth radii

101 R_E

Close Approaches (JPL CAD)

Body	Epoch (TDB)	Time ±	Nominal (au)	Min (au)	Max (au)	v_rel (km/s)
Earth	2026-Oct-09 04:50	00:39	0.00430	0.00423	0.00438	11.04
Moon	2026-Oct-09 12:57	00:42	0.00499	0.00490	0.00508	11.27

Source: JPL Close Approach Data. Distances are measured from each body; 1 au = 149,597,870.7 km.

Orbital Dossier

2026 TB3

Heliocentric osculating elements from the JPL Small-Body Database (solution JPL 1), epoch JD 2461319.5 (2026-Oct-06.0 TDB); ± values are 1-sigma. Dynamical class: APO (near-Earth asteroid orbits which cross the Earth’s orbit, similar to that of 1862 Apollo).

Semi-major axis a

1.8823 au · ±0.011

Eccentricity e

0.5313 ±0.0031

Inclination i

2.333 deg · ±0.010

Orbital period

2.583 yr · 943.3 d

Asc. node Ω

11.215 deg · ±0.0038

Arg. perihelion ω

53.254 deg · ±0.055

Perihelion q

0.8822 au · ±0.00065

Earth MOID

0.003399 au

Orbit quality: solved 2026-Oct-06 16:12:02 from 12 observations, all on 2026-10-06; condition code 8 (JPL scale 0–9, higher is less certain).

JPL Small-Body Database record: ssd.jpl.nasa.gov/tools/sbdb_lookup.html#/?sstr=54660664

Encounter & Physical Parameters

Relative velocity

11.04 km/s

Velocity at infinity

10.99 km/s

Miss-distance range

0.00423 – 0.00438 au

Encounter time uncertainty

± 00:39

Absolute magnitude H

28.535 σ 0.257

Diameter basis

H-derived

PHA class

No (derived)

Scout / Sentry

None in tracker

Astrophyzix Original Analysis · Same clock as the feed

2026 TB3 is an Apollo-class near-Earth asteroid roughly 7 m across (H 28.5; 5.2–11.7 m from the H-derived range). JPL lists its closest Earth pass at 1.675 LD at about 04:50 TDB on 9 October 2026, at 11.04 km/s, followed by a Moon pass at 12:57 TDB. It is not a PHA: H 28.5 is far fainter than the H 22 limit for that class, even though its Earth MOID is only 0.0034 au. Even the closest distance in JPL’s listed range (0.00423 au) is about 99 Earth radii from Earth’s centre, so no listed approach is on an impacting trajectory. The orbit rests on 12 observations from a single night, so the elements and the encounter time (±39 min) carry real uncertainty. This asteroid has an Astrophyzix Risk Index score of 42/100 (safe) at the time of this report. This score may change because Astrophyzix monitoring systems calculate ARI scores in real time based on live NASA observational data. (Refine orbit of this asteroid in real time)

ARI (risk index)

42/100 SAFE

Earth miss distance

1.675 LD

Relative velocity

11.04 km/s

Est. diameter

7.0 m

Absolute magnitude

28.535

Earth MOID

0.0034 au

Orbit class

Apollo (APO)

Condition code

8 12 obs

Data Provenance - Click to View

Report

Layout

Astrophyzix-NEO-Daily/2.2.0 (single-object report)

Object

2026 TB3 (SPK-ID 54660664)

Generated (UTC)

2026-10-07 00:55:01 UTC

Report date

7 October 2026

Analysis

Closest object

2026 TB3 at 1.675 LD

ARI

42/100 (SAFE)

PHA class

No (below PHA-class threshold, derived)

Orbit condition code

8 (12 observations)

Source 1 – JPL Small-Body Database Lookup

Endpoint

ssd.jpl.nasa.gov/tools/sbdb_lookup.html#/?sstr=54660664

Orbit solution

JPL 1, epoch JD 2461319.5 (2026-Oct-06.0 TDB), solved 2026-Oct-06 16:12:02

Ephemerides

DE441 / SB441-N16

Retrieved

7 October 2026

Source 2 – JPL Close Approach Data

Listing

2 entries (Earth, Moon), as shown in the SBDB Lookup table

Retrieved

7 October 2026

Source 3 – Astrophyzix tracker record

Record

Source CAD; derived fields (size, PHA class, ARI)

Docs

Dual-watch PHA and NEO Tracking System

Retrieved

7 October 2026

Constants

Astronomical unit

149,597,870.7 km (IAU 2012 Resolution B2)

Lunar distance

384,400 km (JPL/IAU nominal mean)

Earth mean radius

6,371 km (IUGG)

TT − UTC

69.184 s (37 leap seconds + 32.184 s), valid 2026

Methods

Time scale

Close-approach epochs are TDB; UTC ≈ TDB − 69.184 s

Diameter self-test

D[km] = 1329 / sqrt(pv) × 10^(−H/5), pv 0.25–0.05 (Bowell)

Trajectory integration

None (catalogue report)

Live data

Dual-watch PHA and NEO Tracking System

Primary references: JPL Small-Body Database (ssd.jpl.nasa.gov), NASA CNEOS (cneos.jpl.nasa.gov). Object hazard status should be verified against the CNEOS Sentry table. For live CNEOS Scout and JPL Close Approach Data use the Dual-watch PHA and NEO Tracking System.

Astrophyzix Observatory. (2026). Astrophyzix Digital Observatory Daily Close Approach Report: Methods, Provenance and Limitations Documentation (Version 1). Astrophyzix Digital Observatory. https://doi.org/10.5281/zenodo.22868834

Astrophyzix Observatory. (2026). Astrophyzix Risk Index - A Heuristic Scoring System for Near-Earth Object Close Approach Visualisation (Version 2.0). Astrophyzix. https://doi.org/10.5281/zenodo.22240223

Attribution & Usage

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Newly Discovered NEO Asteroid 2026SC Close Approach Report, Analysis and Complete Official Data Profile - Astrophyzix Digital Observatory

Astrophyzix Scientific Close-Approach & Orbital Report NEO 2026SC Official Data

Asteroid 2026 SC — Small Aten NEO Close-Approach & Orbital Profile · JPL CAD confirmed

✅ Data source: JPL Close-Approach Data (CAD) · confirmed solution, 6-day arc

Top-down schematic. Orbit size and shape are drawn from the published elements (a, e, q, Q); the orientation of the orbit and the marked encounter point are approximate. Note how small and Earth-like this orbit is compared with 2026 SY2's — 2026 SC is an Aten, spending most of its time inside Earth's orbit. 

Copyright © 2026 Astrophyzix - All images, original calculations and analysis are the digital property of Astrophyzix. No distribution without proper attribution 

Aten NEO6-Day Data Arc30 ObservationsARI 42 / 100NO IMPACT RISK — Not on Sentry

Key Takeaways of Asteroid 2026 SC

• Close approach: predicted for 25 Sep 2026 at 13:47 TDB (timing uncertainty ± 4 minutes), confirmed in the JPL CAD record. The miss distance is 1.705 LD (≈ 655,383 km, 0.00438 au).
• Speed: 7.75 km/s relative to Earth (≈ 27,900 km/h) — much slower than 2026 SY2's 25.1 km/s; v∞ 7.68 km/s.
• Orbit class: Aten NEO — a = 0.832 au, e = 0.322, i = 4.66°, orbital period ≈ 277 days (0.76 years). Unlike an Apollo, an Aten spends most of its orbit inside Earth's.
• Earth MOID: 0.0034 au (≈ 509,000 km). This pass, at 0.00438 au, is about 30% farther than the geometric MOID — not the tightest approach this orbit allows.
• Size estimate: absolute magnitude H = 26.159, giving a diameter of about 21 m (range 15.6–34.9 m, albedo-dependent). The size is H-derived, not measured.
• Orbit quality: the solution rests on a 6-day data arc with 30 observations — a longer baseline than a 1-day discovery arc, but still short enough that the elements are provisional.
• Risk context: not a Potentially Hazardous Asteroid (H is above the H ≤ 22 PHA threshold), not on the Sentry watchlist, and no Scout entry.
• Keep it in proportion: a lunar-distance-class flyby from a ~20 m object is a routine, expected detection for current sky surveys. This one is tracked, confirmed and shows no impact geometry.

Approach Scale

Scientific Consensus Snapshot of 2026 SC

Parameter	Status
Orbit class	Aten NEO (a < 1 au, Q > 0.983 au — Earth-crossing, orbit mostly interior to Earth's)
Semi-major axis (a)	0.832 au
Eccentricity (e)	0.322
Perihelion distance (q)	0.564 au
Aphelion distance (Q)	1.10 au
Inclination (i)	4.66°
Orbital period	≈ 277 days (0.76 years)
Earth MOID	0.0034 au (≈ 509,000 km)
Tisserand parameter (TJ)	≈ 7.0 † — well above 3, firmly asteroidal
Absolute magnitude (H)	26.159 (very small object)
Estimated diameter	≈ 21 m (15.6–34.9 m), H-derived
Observations / data arc	30 observations over 6 days
Sentry / Scout	Not on Sentry watchlist · no Scout entry
Hazard level	Non-hazardous size; not PHA-class

† Derived by Astrophyzix from a, e and i. All other values are taken from the JPL CAD/SBDB record.

2026 SC Close-Approach Overview

Date/Time (TDB)	Body	Nominal distance	Min–Max distance (au)	Vrel (km/s)
2026-09-25 13:47 ± 00:04	Earth	0.00438 au 1.705 LD	0.00437 – 0.00440	7.75

1. Asteroid 2026 SC

Small Aten NEO on a compact, Earth-orbit-hugging path, with a lunar-distance flyby predicted for 25 September 2026 and a tight Earth MOID — a routine, well-characterised approach with no impact geometry in current solutions.

Asteroid 2026 SC Orbital Geometry

Parameter	Value
Orbit class	Aten (ATE) — Earth-crossing NEO
Semi-major axis (a)	0.832 au
Eccentricity (e)	0.322
Perihelion distance (q)	0.564 au
Aphelion distance (Q)	1.10 au
Inclination (i)	4.66°
Longitude of node (Ω)	180°
Argument of perihelion (ω)	325°
Mean anomaly (M)	103°
Mean motion (n)	≈ 1.30 deg/day †
Orbital period	≈ 277 days (0.76 years)
Earth MOID	0.0034 au (≈ 509,000 km)
Data arc	6 days
Observations used	30

Physical Characteristics of NEO 2026 SC

Parameter	Value
Absolute magnitude (H)	26.159
Estimated diameter	≈ 15.6–34.9 m (nominal 20.8 m, assuming albedo 0.25–0.05)
Size source	H-derived (no radar or thermal measurement)
Rotation period	Not published
Spectral type	Unknown (no published taxonomy)
PHA classification	No — below PHA-class threshold (derived)

2026 SC is a small Aten NEO whose orbit lies almost entirely inside Earth's, ranging from 0.564 au at perihelion (between Mercury's and Venus's distances) out to 1.10 au at aphelion, just beyond Earth's own orbit. That small overshoot at aphelion is what makes it Earth-crossing and gives it a tight MOID of 0.0034 au. At an estimated 15–35 m across, it is in the same general size class as the 2013 Chelyabinsk fireball (about 18–20 m), though it is passing at a safe distance with no impact geometry in current solutions.

Interpretation of the Predicted Approach

The 6-day data arc and 30 observations give a noticeably firmer orbit than a bare 1-day discovery arc, but the elements are still short-arc and will tighten further as more astrometry comes in before and after the 25 September pass.

Because the approach distance (0.00438 au) sits somewhat above the orbit's Earth MOID (0.0034 au), this particular encounter is not the closest geometry the orbit permits — a useful reminder that MOID describes the orbits' closest possible separation, not any single flyby.

Astrophyzix Assessment:

Astrophyzix confirms that it's predicted 25 September 2026 approach is safe, non-hazardous and a good target for follow-up astrometry. Astrophyzix Orbital calculations are consistent with NASA and no impact risk is suggested. Its Aten orbit and short period make it a candidate for early recovery in future apparitions.

Astrophyzix Risk Index (ARI)

42 / 100 for 2026 SC — close to the ARI recorded for 2026 SY2 (43) despite a much slower, more distant pass, reflecting its somewhat larger estimated size.

ARI is an Astrophyzix composite index used to rank close approaches at a glance. It is not an official NASA, ESA or IAU hazard rating; the authoritative impact-risk sources are Sentry and Scout.

PHA NEO Asteroid Near-Earth Object Close-Approach Report: June 17, 2026 - Official NASA CAD & NeoWs Data

ASTROPHYZIX // PLANETARY Defence Asteroid News

Near-Earth Object Close-Approach Report: June 17, 2026

Near-Earth object encounters catalogued across a 7-day window, reported on the UTC civil time scale. NO IMPACT THREAT REPORTED 

On June 17, 2026,  screening of the NASA NeoWs catalogue resolves 37 near-Earth object close approaches across the report window. The single closest encounter reported by NASA NEOWS is 2003 LN6, passing at approximately 3.68 lunar distances (1,417,040 km) with a relative velocity near 3.9 km/s. Its order-of-magnitude kinetic energy, for scale only, is near 0 Mt TNT equivalent; no listed object is on an impacting trajectory. Screening of Live NASA JPL CAD shows only routine safe approaches. The next closest encounter reported by NASA CAD is 2026 LO1 at just over 14 lunar distances as shown below with five objects which are approaching shortly after.  A seven day outlook from NASA’s NeoWs is included for comprehensive coverage from both NASA data sets. 

Next Asteroid Close Approaches (NASA CAD Data - Live at time of writing) 

(2026 LO1)JPL CAD

2026-06-17 01:09 TDB

Safe

Miss Distance

14.090 LD

Velocity

7.47 km/s

Est. Size (H-derived)

40 m

Abs. Mag (H)

24.8

Distance Band

3-sig band: 0.03615 - 0.03625 AU

Time Uncertainty

CA time unc.: < 00:01

ARI (Astrophyzix Risk Index)

16

(2018 KH1)JPL CAD

2026-06-17 07:35 TDB

Safe

Miss Distance

73.008 LD

Velocity

13.38 km/s

Est. Size (H-derived)

145 m

Abs. Mag (H)

21.9

Distance Band

3-sig band: 0.18760 - 0.18760 AU

Time Uncertainty

CA time unc.: < 00:01

ARI (Astrophyzix Risk Index)

19

(2021 JZ1)JPL CAD

2026-06-17 07:47 TDB

Safe

Miss Distance

76.363 LD

Velocity

8.56 km/s

Est. Size (H-derived)

52 m

Abs. Mag (H)

24.2

Distance Band

3-sig band: 0.16086 - 0.23251 AU

Time Uncertainty

CA time unc.: 4_00:13

ARI (Astrophyzix Risk Index)

12

(2026 LD2)JPL CAD

2026-06-18 08:20 TDB

Safe

Miss Distance

8.702 LD

Velocity

8.04 km/s

Est. Size (H-derived)

18 m

Abs. Mag (H)

26.5

Distance Band

3-sig band: 0.02227 - 0.02245 AU

Time Uncertainty

CA time unc.: < 00:01

ARI (Astrophyzix Risk Index)

22

(2002 WX12)JPL CAD

2026-06-18 12:14 TDB

Safe

Miss Distance

53.981 LD

Velocity

18.53 km/s

Est. Size (H-derived)

349 m

Abs. Mag (H)

20.0

Distance Band

3-sig band: 0.13871 - 0.13871 AU

Time Uncertainty

CA time unc.: < 00:01

ARI (Astrophyzix Risk Index)

30

(2026 MA)JPL CAD

2026-06-18 18:06 TDB

Safe

Miss Distance

5.163 LD

Velocity

8.75 km/s

Est. Size (H-derived)

15 m

Abs. Mag (H)

26.9

Distance Band

3-sig band: 0.01324 - 0.01330 AU

Time Uncertainty

CA time unc.: < 00:01

ARI (Astrophyzix Risk Index)

30

Live Nasa CAD Data Provenance: relay=allorigins-get / allorigins-get | CAD v1.5 | Scout v1.3 | source=CAD + SCOUT | fetched=Wed, 17 Jun 2026 23:04:01 UTC | window(TDB)=2026-06-17..2026-06-23 | dist-max=0.2056AU | validation=PASS