2023 DW is anear-Earth asteroid of theAten group. It is approximately 50 meters (160 feet) in diameter, roughly the size of theasteroid that caused theTunguska event,^[a] and was discovered byGeorges Attard andAlain Maury, from the MAP (Maury/Attard/Parrott) asteroid search program inSan Pedro de Atacama on 26 February 2023, when it was 0.07 AU (10 million km) from Earth.^[1] On 28 February 2023, with anobservation arc of 1.2 days, it was rated 1 on theTorino scale for a virtual impactor on 14 February 2046 at 21:36UTC.^[6] Thenominal approach is expected to occur about eight hours before the impact scenario at 14 February 2046 13:15 ± 72 minutes.^[3] Between 5–8 March, the asteroid was not observed as it was within 40 degrees of thewaxing gibbous moon.^[7] On 14 March 2023 theEuropean Space Agency was the first to drop to a Torino scale rating of 0.^[8]Sentry dropped to a Torino scale rating of 0 on 16 March 2023.^[9] It was completely removed from both risk tables on 20 March 2023.^[10]

2023 DW currently orbits theSun once every 271 days.^[3] It came toperihelion (closest approach to the Sun) on 26 November 2022, and then approached Earth from the direction of the Sun making closest Earth approach on 18 February 2023 at distance of about 8.7 million km.^[3]

With an observation arc of 13 days it peaked at aPalermo scale rating of –1.89^[11] with the odds of impact then being about 78 times less than the background hazard level.^[b] It was removed from the risk table on 20 March 2023.

Risk corridor as it was known on 3 March 2023 with a 4-day observation arc and 55 observations. The asteroid would have most likely impacted thePacific Ocean. At the time of the potential impactor, the asteroid is most likely to miss Earth by about 4.7 million km and has a3-sigma uncertainty region of± 3 million km.^[21] As the uncertainty region gets smaller the probability of impact can increase and then suddenly drop to 0.

• 
  Risk corridor overIndonesia and the Pacific Ocean
• 
  Risk corridor over the Pacific Ocean andHawaii
• 
  Risk corridor overMexico and theUnited States
• 
  Diagram showing why as the uncertainty region gets smaller the probability of impact can increase and then suddenly drop to 0.

  This article'sfactual accuracy isdisputed. Relevant discussion may be found onTalk:Torino scale. Please help to ensure that disputed statements arereliably sourced.(February 2025) (Learn how and when to remove this message)

• 2023 DW atNeoDyS-2, Near Earth Objects—Dynamic Site
  • Ephemerides · Observation prediction · Orbital info · MOID · Proper elements · Observational info · Close approaches · Physical info · Orbit animation
• 2023 DW atESA–space situational awareness
  • Ephemerides · Observations · Orbit · Physical properties · Summary
• 2023 DW at theJPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit viewer · Orbit parameters · Physical parameters
• LOV (uncertainty region):5000 clones calculated in SOLEX 12.1. Based on 60 observations through March 4 /5000 clones, SOLEX 12.1, 69 observations through March 11 /5000 clones, SOLEX 12.1, 104 observations through March 15 (ptastro1)
• Risk Corridor Calculations:Piero_Sicoli andStevearenoBR
• Discovery circumstances:Alain Maury's blog

• Aten asteroids
• Minor planet object articles (unnumbered)
• Near-Earth objects removed from the Sentry Risk Table
• Near-Earth objects in 2023
• Astronomical objects discovered in 2023

• Accuracy disputes from February 2025
• All accuracy disputes
• Articles with short description
• Short description is different from Wikidata
• Use dmy dates from March 2023
• JPL Small-Body Database ID same as Wikidata