Astrophyzix Observatory PHA & NEO Asteroid News

Daily Asteroid Bulletin · NASA NeoWs catalogue · UTC

Near-Earth Object (NEO) and Potentially Hazardous Asteroid Report: October 4, 2026

Catalogued Earth close-approaches across a 7-day window from the NASA NeoWs feed (JPL small-body solutions; cached at source). This bulletin is a catalogue report, not a live CNEOS CAD/Scout stream. Live Multi-watch CAD/Scout/Sentry tracker.

On October 4, 2026 (UTC), screening of the NASA NeoWs catalogue resolves 46 near-Earth object close approaches across the report window. The single closest encounter is 2015 TS238, passing at approximately 4.72 lunar distances (1,813,910 km) with a relative velocity near 15.8 km/s. No listed object is on an impacting trajectory.

CLOSEST CATALOGUED APPROACH IN OBSERVATION WINDOW

2015 TS238

4.72 LD

1,813,910 km · 0.012125 au · v_rel 15.81 km/s

EARTH SURFACE19.5 LD (FILTER EDGE)

Encounter (UTC)

2026-Oct-08 17:12

Est. diameter

0.033 km (NeoWs)

Diameter range

0.022 - 0.049 km

Earth radii

285 R(E)

Close Approaches On Report Date

Object	Epoch (UTC)	Dist (LD)	Dist (km)	v_rel	Diameter	Status
2009 UD	2026-Oct-04 07:03	122.78	47,218,840	12.7	0.014	ROUTINE
2019 UM8	2026-Oct-04 11:49	161.15	61,974,605	18.2	0.008	ROUTINE
2017 WK15	2026-Oct-04 20:07	170.38	65,522,606	17.0	0.018	ROUTINE

Lead Object Orbital Dossier

2015 TS238

Heliocentric osculating elements from NeoWs, epoch JD 2461000.5. Dynamical class: APO (Near-Earth asteroid orbits which cross the Earth’s orbit similar to that of 1862 Apollo).

Semi-major axis a

1.1434 au

Eccentricity e

0.4994

Inclination i

3.324 deg

Orbital period

1.223 yr

Asc. node OM

190.989 deg

Arg. perihelion w

78.226 deg

JPL Small-Body Database record: https://ssd.jpl.nasa.gov/tools/sbdb_lookup.html#/?sstr=3730801

7-Day Forward Outlook - Scroll Left/Right

Object	Epoch (UTC)	Dist (LD)	Dist (km)	v_rel	Diameter	Status
2015 XX169	2026-Oct-05 03:10	89.22	34,312,498	5.3	0.013	ROUTINE
2001 SH276	2026-Oct-05 03:48	54.38	20,913,691	10.8	0.458	ROUTINE
2007 UW1	2026-Oct-05 10:14	32.97	12,677,806	4.7	0.115	ROUTINE
2017 SX20	2026-Oct-06 02:26	164.94	63,429,518	16.0	0.059	ROUTINE
2017 EJ3	2026-Oct-06 06:59	98.96	38,056,500	6.9	0.090	ROUTINE
2012 KT42	2026-Oct-06 07:01	87.82	33,774,141	11.7	0.006	ROUTINE
2018 TZ1	2026-Oct-06 12:34	113.51	43,654,128	13.8	0.040	ROUTINE
2010 SJ	2026-Oct-06 17:40	192.67	74,094,317	19.4	0.069	ROUTINE
2018 SL1	2026-Oct-06 19:16	122.09	46,951,512	12.2	0.024	ROUTINE
2018 AG12	2026-Oct-06 20:09	166.79	64,143,759	8.4	0.072	ROUTINE
2013 TH	2026-Oct-07 03:38	50.67	19,486,769	6.9	0.069	ROUTINE
2018 CH	2026-Oct-07 04:24	194.03	74,617,494	19.4	0.021	ROUTINE
1998 SL36	2026-Oct-07 04:47	154.97	59,595,365	22.5	0.359	PHA
660096 (1998 SL36	2026-Oct-07 04:47	154.97	59,595,365	22.5	0.358	PHA
2018 HK	2026-Oct-07 06:54	69.68	26,795,958	20.4	0.204	ROUTINE
2015 FD35	2026-Oct-07 19:14	70.91	27,269,809	17.4	0.287	ROUTINE
2005 TQ45	2026-Oct-07 23:08	149.34	57,430,728	19.4	0.030	ROUTINE
2013 HP11	2026-Oct-07 23:15	126.21	48,534,748	5.8	0.033	ROUTINE
2007 TH3	2026-Oct-08 07:39	131.11	50,420,385	14.7	0.046	ROUTINE
2009 UU1	2026-Oct-08 08:47	116.52	44,809,139	18.9	0.046	ROUTINE

Astrophyzix analysis · same clock as the feed

The window contains 46 catalogued Earth close-approaches (3 on the report date, 43 in the forward outlook). The nearest listed geometry is 2015 TS238 at 4.72 LD (non-PHA), relative velocity 15.8 km/s. 1 additional pass inside 5 LD. 4 objects in the window are flagged potentially hazardous (size and MOID criteria, not this week's miss distance). No listed object is on an impacting trajectory in this catalogue.

Approaches in window

On report date

PHA in window

Inside 1 LD

Inside 5 LD

Median miss

122.44 LD

Fastest v_rel

40.5 km/s

Closest object

2015 TS238

Methodology

Close-approach geometry is taken from NASA NeoWs, which is fed by the Jet Propulsion Laboratory Solar System Dynamics small-body solutions that also underpin CNEOS. No local trajectory integration is performed; the report consumes NASA solutions directly to preserve the authoritative state. The analysis block is a deterministic summary of those same records.

Source choice. JPL CNEOS CAD and SBDB (ssd-api.jpl.nasa.gov) cannot be called from a browser (NASA CORS), so this bulletin uses NeoWs (api.nasa.gov) — the same JPL small-body solutions, CORS-enabled. Live CAD/Scout/Sentry is a separate console: Multi-watch tracker.
Time scale. NeoWs reports close-approach epochs on the UTC civil scale. For reference the BCRS dynamical offset is TT - UTC = 69.184 s for 2026 (37 leap seconds plus the 32.184 s TAI-to-TT constant).
Distance units. Miss distance is taken from NeoWs in astronomical units and lunar distances (1 au = 149,597,871 km, 1 LD = 384,400 km, IAU 2012).
Size estimate. Diameter uses the NeoWs estimated_diameter bracket (derived from absolute magnitude H with standard albedo bounds); the geometric mean is reported.
Analysis. Counts, medians and the narrative are computed from the Float64 state after validation, in the same pipeline tick as render. The analysis is never stored separately from the feed, so it cannot disagree with the tables.
Validation. Every record is range-checked (0 < dist ≤ 1 au; 0.05 ≤ v_rel ≤ 100 km/s; -5 ≤ H ≤ 40) and a diameter-from-H constant self-test runs each build. Result: PASS (H=22 -> 0.106-0.237 km); flagged records: 0.

Data Provenance

Module: Astrophyzix-NEO-Daily/2.2.0
Generated (UTC): 2026-10-04T00:32:04.082Z
Cache state: HIT (age 20 min)
Analysis digest: 46 approaches (3 today / 43 outlook); closest 2015 TS238 @ 4.72 LD; PHA 4; sub-lunar 0; notable 1; median miss 122.44 LD; anomalies 0
Analysis generated (UTC): 2026-10-04T00:32:04.082Z
Source 1: NASA NeoWs feed
  endpoint: https://api.nasa.gov/neo/rest/v1/feed?start_date=2026-10-04&end_date=2026-10-11&api_key=***
  docs: https://api.nasa.gov/
  retrieved: 2026-10-04T00:12:12.374Z
Source 2: NASA NeoWs lookup
  endpoint: https://api.nasa.gov/neo/rest/v1/neo/3730801?api_key=***
  docs: https://api.nasa.gov/
  retrieved: 2026-10-04T00:12:13.913Z
Constants:
  - AU = 149597870.7 km (IAU 2012 Resolution B2)
  - Lunar distance = 384400 km (JPL/IAU nominal mean)
  - Earth mean radius = 6371 km (IUGG)
  - TT - UTC = 69.184 s (37 leap seconds + 32.184 s), valid 2026
  - Diameter self-test: D[km] = 1329 / sqrt(pv) * 10^(-H/5), pv 0.25-0.05 (Bowell)
Source note: For live CNEOS Scout and JPL Close Approach Data use the Dual-watch PHA and NEO Tracking System: https://www.astrophyzix.com/p/live-asteroid-tracker-v9.html
Pipeline trace: INIT@1750ms -> CACHE_LOOKUP@1751ms -> PARSE@2003ms -> COMPUTE@2006ms -> VALIDATE@2006ms -> ANALYSE@2007ms -> RENDER@2009ms

Primary references: NASA NeoWs / api.nasa.gov (api.nasa.gov), NASA CNEOS (cneos.jpl.nasa.gov). Object hazard status should be verified against the CNEOS Sentry table.

Data are reproducible using the Astrophyzix Orbital Refinement System.

Methodology documents