# 2023 DW

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Near-Earth asteroid discovered in 2023

2023 DW Discovery[1][2] Discovered by Georges Attard and Alain Maury Discovery site San Pedro de Atacama Discovery date 26 February 2023 Designations Alternative designations 3BP2721[2] Minor planet category NEO Aten Orbital characteristics[3] Epoch 2025-Nov-21 (JD 2461000.5) Uncertainty parameter 1 Observation arc 1118 days Aphelion 1.1450 AU (Q) Perihelion 0.4952 AU (q) Semi-major axis 0.8201 AU (a) Eccentricity 0.3962 (e) Orbital period (sidereal) 0.743 years (271 days) Mean anomaly 7.3° (M) Inclination 5.806° (i) Longitude of ascending node 326.09° (Ω) Time of perihelion 2022-Nov-26 Argument of perihelion 40.47° (ω) Earth MOID 0.00034 AU (51 thousand km) Venus MOID 0.03 AU (4.5 million km)[4] Jupiter MOID 4.31 AU (645 million km) Physical characteristics Mean diameter ≈47 m (150 ft)[5] 37–82 meters[a] Absolute magnitude (H) 24.3 (MPC)[4]

**2023 DW** is a [near-Earth asteroid](/source/Near-Earth_object) of the [Aten group](/source/Aten_asteroid). It is approximately 50 meters (160 feet) in diameter, roughly the size of the [asteroid](/source/Asteroid) that caused the [Tunguska event](/source/Tunguska_event),[a] and was discovered by [Georges Attard](https://en.wikipedia.org/w/index.php?title=Georges_Attard&action=edit&redlink=1) and [Alain Maury](/source/Alain_Maury), from the MAP (Maury/Attard/Parrott) asteroid search program in [San Pedro de Atacama](/source/San_Pedro_de_Atacama) on 26 February 2023, when it was 0.07 [AU](/source/Astronomical_unit) (10 million [km](/source/Kilometre)) from Earth.[1] On 28 February 2023, with an [observation arc](/source/Observation_arc) of 1.2 days, it was rated 1 on the [Torino scale](/source/Torino_scale) for a virtual impactor on 14 February 2046 at 21:36 [UTC](/source/Coordinated_Universal_Time).[6] The [nominal](/source/Curve_fitting) 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 the [waxing gibbous moon](/source/Lunar_phase#waxinggibbous).[7] On 14 March 2023 the [European Space Agency](/source/European_Space_Agency) was the first to drop to a Torino scale rating of 0.[8] [Sentry](/source/Sentry_(monitoring_system)) 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 the [Sun](/source/Sun) once every 271 days.[3] It came to [perihelion](/source/Perihelion) (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]

## Risk

With an observation arc of 13 days it peaked at a [Palermo scale](/source/Palermo_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.

2023 DW nominal approach for 14 February 2046 21:36 virtual impactor Solution Observation arc (in days) JPL Horizons nominal geocentric distance (AU) uncertainty region (3-sigma) Impact probability Torino scale Palermo scale (max) JPL #2 (2023-Feb-28) 2 (38 obs) 0.0165 AU (2.47 million km) ± 21 million km 1:830[12] 1 –2.28 JPL #5 (2023-Mar-03) 4 (55 obs) 0.0181 AU (2.71 million km) ± 18 million km 1:710[13] 1 –2.21 JPL #6 (2023-Mar-04) 6 (60 obs) 0.0095 AU (1.42 million km) ± 13 million km 1:543 1 –2.11 JPL #7 (2023-Mar-05) 6 (62 obs) 0.0124 AU (1.86 million km) ± 13 million km 1:613[14] 1 –2.16 JPL #8 (2023-Mar-06) 6 (62 obs) 0.0123 AU (1.84 million km) ± 13 million km 1:560[15] 1 –2.12 JPL #9 (2023-Mar-11) 13 (69 obs) 0.0121 AU (1.81 million km) ± 8 million km 1:420[16] 1 –1.98 JPL #10 (2023-Mar-12) 13 (77 obs) 0.0097 AU (1.45 million km) ± 7 million km 1:360[11] 1 –1.89 JPL #11 (2023-Mar-13) 15 (91 obs) 0.0186 AU (2.78 million km) ± 7 million km 1:670[17] 1 –2.18 JPL #12 (2023-Mar-14) 16 (99 obs) 0.0192 AU (2.87 million km) ± 7 million km 1:770[18] 1 –2.23 JPL #13 (2023-Mar-15) 17 (104 obs) 0.0198 AU (2.96 million km) ± 6 million km 1:1000[19] 1 –2.34 JPL #14 (2023-Mar-16) 17 (112 obs) 0.0216 AU (3.23 million km) ± 5 million km 1:3600[9] 0 –2.90 JPL #15 (2023-Mar-17) 18 (115 obs) 0.0214 AU (3.20 million km) ± 5 million km 1:3400[20] 0 –2.88 JPL #16 (2023-Mar-19) 20 (118 obs) 0.0303 AU (4.53 million km) ± 4 million km N/A[5][c] N/A N/A JPL #17 (2023-Mar-20) 21 (123 obs) 0.0317 AU (4.74 million km) ± 3 million km N/A[10] N/A N/A

2023 DW Earth approach on 14 February 2046 (about 8 hours before the impact scenario) Date & time Nominal distance 2046-Feb-14 13:15 ± 72 minutes 4730116 km[3]

### Risk corridor

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 the [Pacific Ocean](/source/Pacific_Ocean). At the time of the potential impactor, the asteroid is most likely to miss Earth by about 4.7 million km and has a [3-sigma](/source/3-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 over [Indonesia](/source/Indonesia) and the Pacific Ocean

		- Risk corridor over the Pacific Ocean and [Hawaii](/source/Hawaii)

		- Risk corridor over [Mexico](/source/Mexico) and the [United States](/source/United_States)

		- Diagram showing why as the uncertainty region gets smaller the probability of impact can increase and then suddenly drop to 0. This article's factual accuracy is disputed. Relevant discussion may be found on Talk:Torino scale. Please help to ensure that disputed statements are reliably sourced. (February 2025) (Learn how and when to remove this message)

## Notes

1. ^ [***a***](#cite_ref-Tunguska_6-0) [***b***](#cite_ref-Tunguska_6-1) The [Tunguska asteroid](/source/Tunguska_event) is estimated to have been a common stony asteroid about 50–60 meters in diameter and similar in size to 2023 DW. The [Chelyabinsk meteor](/source/Chelyabinsk_meteor) was only about 18 meters in diameter. [Meteor Crater](/source/Meteor_Crater) was created by a relatively rare [(only 5% of the population) iron-nickel meteor](/source/Iron_meteorite#Occurrence) about 50 meters in diameter.

1. **[^](#cite_ref-background_13-0)** "Background risk" is defined as the average risk posed by objects of the same size or larger over the years until the date of the potential impact. A [Palermo scale](/source/Palermo_Technical_Impact_Hazard_Scale) rating of 0 would be equal to the background risk.

1. **[^](#cite_ref-3sigma_23-0)** The risk of impact dropped significantly as the [3-sigma](/source/3-sigma) uncertainty region became smaller than the [nominal](/source/Curve_fitting) approach distance.

## References

1. ^ [***a***](#cite_ref-MPEC2023-D71_1-0) [***b***](#cite_ref-MPEC2023-D71_1-1) ["MPEC 2023-D71 : 2023 DW"](https://www.minorplanetcenter.net/mpec/K23/K23D71.html). IAU Minor Planet Center. 27 February 2023. Retrieved 5 March 2023. (K23D00W)

1. ^ [***a***](#cite_ref-Maury_2-0) [***b***](#cite_ref-Maury_2-1) ["2023 DW"](https://www.spaceobs.com/en/Alain-Maury-s-Blog/2023-DW). *Alain Maury's Blog*. Retrieved 11 March 2023.

1. ^ [***a***](#cite_ref-jpldata_3-0) [***b***](#cite_ref-jpldata_3-1) [***c***](#cite_ref-jpldata_3-2) [***d***](#cite_ref-jpldata_3-3) [***e***](#cite_ref-jpldata_3-4) ["JPL Small-Body Database Browser: (2023 DW)"](https://ssd.jpl.nasa.gov/tools/sbdb_lookup.html#/?sstr=2023%20DW&view=OPC). [Jet Propulsion Laboratory](/source/Jet_Propulsion_Laboratory). Retrieved 20 March 2023.

1. ^ [***a***](#cite_ref-MPC-object_4-0) [***b***](#cite_ref-MPC-object_4-1) ["2023 DW Orbit"](https://www.minorplanetcenter.net/db_search/show_object?object_id=2023+DW). *Minor Planet Center*. Retrieved 5 March 2023.

1. ^ [***a***](#cite_ref-Sentry20_5-0) [***b***](#cite_ref-Sentry20_5-1) ["Archive of Sentry Risk Table: 2023 DW (20.3 day arc)"](https://cneos.jpl.nasa.gov/sentry/details.html%23?des=2023%20DW). NASA JPL [CNEOS](/source/Center_for_Near-Earth_Object_Studies).{{[cite web](https://en.wikipedia.org/wiki/Template:Cite_web)}}: CS1 maint: deprecated archival service ([link](https://en.wikipedia.org/wiki/Category:CS1_maint:_deprecated_archival_service))

1. **[^](#cite_ref-Sentry1_7-0)** ["Archive of Sentry Risk Table: 2023 DW (1.2 day arc)"](https://cneos.jpl.nasa.gov/sentry/details.html%23?des=2023%20DW). NASA JPL [CNEOS](/source/Center_for_Near-Earth_Object_Studies).{{[cite web](https://en.wikipedia.org/wiki/Template:Cite_web)}}: CS1 maint: deprecated archival service ([link](https://en.wikipedia.org/wiki/Category:CS1_maint:_deprecated_archival_service))

1. **[^](#cite_ref-moon_8-0)** ["JPL Horizons: 2023 DW Target-Observer-Moon (lunar elongation) for 4–10 March 2023"](https://ssd.jpl.nasa.gov/horizons_batch.cgi?batch=1&COMMAND=%272023+DW%27&START_TIME=%272023-03-04%27&STOP_TIME=%272023-03-10%27&STEP_SIZE=%271%20day%27&QUANTITIES=%279,25%27). JPL Horizons.

1. **[^](#cite_ref-esa-risk20230314_9-0)** ["Archive (14 March 2023): ESA Risk List"](https://web.archive.org/web/20230314044240/https://neo.ssa.esa.int/risk-list). [European Space Agency](/source/European_Space_Agency) near-earth objects coordination centre. Archived from [the original](https://neo.ssa.esa.int/risk-list) on 14 March 2023.

1. ^ [***a***](#cite_ref-Sentry17B_10-0) [***b***](#cite_ref-Sentry17B_10-1) ["Archive of Sentry Risk Table: 2023 DW (17.7 day arc)"](https://cneos.jpl.nasa.gov/sentry/details.html%23?des=2023%20DW). NASA JPL [CNEOS](/source/Center_for_Near-Earth_Object_Studies).{{[cite web](https://en.wikipedia.org/wiki/Template:Cite_web)}}: CS1 maint: deprecated archival service ([link](https://en.wikipedia.org/wiki/Category:CS1_maint:_deprecated_archival_service))

1. ^ [***a***](#cite_ref-removed_11-0) [***b***](#cite_ref-removed_11-1) ["Sentry (Removed Objects)"](https://cneos.jpl.nasa.gov/sentry/removed.html). NASA/JPL Near-Earth Object Program Office.{{[cite web](https://en.wikipedia.org/wiki/Template:Cite_web)}}: CS1 maint: deprecated archival service ([link](https://en.wikipedia.org/wiki/Category:CS1_maint:_deprecated_archival_service))

1. ^ [***a***](#cite_ref-Sentry13B_12-0) [***b***](#cite_ref-Sentry13B_12-1) ["Archive of Sentry Risk Table: 2023 DW (13.8 day arc)"](https://cneos.jpl.nasa.gov/sentry/details.html%23?des=2023%20DW). NASA JPL [CNEOS](/source/Center_for_Near-Earth_Object_Studies).{{[cite web](https://en.wikipedia.org/wiki/Template:Cite_web)}}: CS1 maint: deprecated archival service ([link](https://en.wikipedia.org/wiki/Category:CS1_maint:_deprecated_archival_service))

1. **[^](#cite_ref-Sentry2_14-0)** ["Archive of Sentry Risk Table: 2023 DW (2.0 day arc)"](https://cneos.jpl.nasa.gov/sentry/details.html%23?des=2023%20DW). NASA JPL [CNEOS](/source/Center_for_Near-Earth_Object_Studies).{{[cite web](https://en.wikipedia.org/wiki/Template:Cite_web)}}: CS1 maint: deprecated archival service ([link](https://en.wikipedia.org/wiki/Category:CS1_maint:_deprecated_archival_service))

1. **[^](#cite_ref-Sentry4_15-0)** ["Archive of Sentry Risk Table: 2023 DW (3.9 day arc)"](https://cneos.jpl.nasa.gov/sentry/details.html%23?des=2023%20DW). NASA JPL [CNEOS](/source/Center_for_Near-Earth_Object_Studies).{{[cite web](https://en.wikipedia.org/wiki/Template:Cite_web)}}: CS1 maint: deprecated archival service ([link](https://en.wikipedia.org/wiki/Category:CS1_maint:_deprecated_archival_service))

1. **[^](#cite_ref-esa-risk20230305_16-0)** ["Archive (05 March 2023): ESA Risk List"](https://web.archive.org/web/20230305210103/https://neo.ssa.esa.int/risk-list). [European Space Agency](/source/European_Space_Agency) near-earth objects coordination centre. Archived from [the original](https://neo.ssa.esa.int/risk-list) on 5 March 2023.

1. **[^](#cite_ref-Sentry6_17-0)** ["Archive of Sentry Risk Table: 2023 DW (6.8 day arc)"](https://cneos.jpl.nasa.gov/sentry/details.html%23?des=2023%20DW). NASA JPL [CNEOS](/source/Center_for_Near-Earth_Object_Studies).{{[cite web](https://en.wikipedia.org/wiki/Template:Cite_web)}}: CS1 maint: deprecated archival service ([link](https://en.wikipedia.org/wiki/Category:CS1_maint:_deprecated_archival_service))

1. **[^](#cite_ref-Sentry13_18-0)** ["Archive of Sentry Risk Table: 2023 DW (13.1 day arc)"](https://cneos.jpl.nasa.gov/sentry/details.html%23?des=2023%20DW). NASA JPL [CNEOS](/source/Center_for_Near-Earth_Object_Studies).{{[cite web](https://en.wikipedia.org/wiki/Template:Cite_web)}}: CS1 maint: deprecated archival service ([link](https://en.wikipedia.org/wiki/Category:CS1_maint:_deprecated_archival_service))

1. **[^](#cite_ref-Sentry15_19-0)** ["Archive of Sentry Risk Table: 2023 DW (15.0 day arc)"](https://cneos.jpl.nasa.gov/sentry/details.html%23?des=2023%20DW). NASA JPL [CNEOS](/source/Center_for_Near-Earth_Object_Studies).{{[cite web](https://en.wikipedia.org/wiki/Template:Cite_web)}}: CS1 maint: deprecated archival service ([link](https://en.wikipedia.org/wiki/Category:CS1_maint:_deprecated_archival_service))

1. **[^](#cite_ref-Sentry16_20-0)** ["Archive of Sentry Risk Table: 2023 DW (16.0 day arc)"](https://cneos.jpl.nasa.gov/sentry/details.html%23?des=2023%20DW). NASA JPL [CNEOS](/source/Center_for_Near-Earth_Object_Studies).{{[cite web](https://en.wikipedia.org/wiki/Template:Cite_web)}}: CS1 maint: deprecated archival service ([link](https://en.wikipedia.org/wiki/Category:CS1_maint:_deprecated_archival_service))

1. **[^](#cite_ref-Sentry17_21-0)** ["Archive of Sentry Risk Table: 2023 DW (16.9 day arc)"](https://cneos.jpl.nasa.gov/sentry/details.html%23?des=2023%20DW). NASA JPL [CNEOS](/source/Center_for_Near-Earth_Object_Studies).{{[cite web](https://en.wikipedia.org/wiki/Template:Cite_web)}}: CS1 maint: deprecated archival service ([link](https://en.wikipedia.org/wiki/Category:CS1_maint:_deprecated_archival_service))

1. **[^](#cite_ref-Sentry18_22-0)** ["Archive of Sentry Risk Table: 2023 DW (17.9 day arc)"](https://cneos.jpl.nasa.gov/sentry/details.html%23?des=2023%20DW). NASA JPL [CNEOS](/source/Center_for_Near-Earth_Object_Studies).{{[cite web](https://en.wikipedia.org/wiki/Template:Cite_web)}}: CS1 maint: deprecated archival service ([link](https://en.wikipedia.org/wiki/Category:CS1_maint:_deprecated_archival_service))

1. **[^](#cite_ref-Horizons2023DW_24-0)** ["JPL Horizons: 2023 DW geocentric distance and uncertainty on 14 February 2046"](https://ssd.jpl.nasa.gov/horizons_batch.cgi?batch=1&COMMAND=%272023+DW%27&START_TIME=%272046-02-14%2021:36%27&STOP_TIME=%272046-02-15%27&STEP_SIZE=%272%20day%27&QUANTITIES=%2720,39%27). JPL Horizons. [Archived](https://web.archive.org/web/20230304160813/https://ssd.jpl.nasa.gov/horizons_batch.cgi?batch=1&COMMAND=%272023+DW%27&START_TIME=%272046-02-14%2021:36%27&STOP_TIME=%272046-02-15%27&STEP_SIZE=%272%20day%27&QUANTITIES=%2720,39%27) from the original on 4 March 2023. Retrieved 20 March 2023.

## External links

- [2023 DW](https://newton.spacedys.com/neodys/index.php?n=2023DW&pc=1.1.0) at *NeoDyS-2, Near Earth Objects—Dynamic Site* - [Ephemerides](https://newton.spacedys.com/neodys/index.php?n=2023DW&pc=1.1.3.0) **·** [Observation prediction](https://newton.spacedys.com/neodys/index.php?n=2023DW&pc=1.1.4.0) **·** [Orbital info](https://newton.spacedys.com/neodys/index.php?n=2023DW&pc=1.1.1) **·** [MOID](https://newton.spacedys.com/neodys/index.php?n=2023DW&pc=1.1.5) **·** [Proper elements](https://newton.spacedys.com/neodys/index.php?n=2023DW&pc=1.1.6) **·** [Observational info](https://newton.spacedys.com/neodys/index.php?n=2023DW&pc=1.1.7.0) **·** [Close approaches](https://newton.spacedys.com/neodys/index.php?n=2023DW&pc=1.1.8) **·** [Physical info](https://newton.spacedys.com/neodys/index.php?n=2023DW&pc=1.1.9) **·** [Orbit animation](https://newton.spacedys.com/neodys/index.php?n=2023DW&pc=1.1.A)

- [2023 DW](https://neo.ssa.esa.int/search-for-asteroids?sum=1&des=2023DW) at *ESA–[space situational awareness](/source/Space_Situational_Awareness_Programme)* - [Ephemerides](https://neo.ssa.esa.int/search-for-asteroids?des=2023DW&tab=eph) **·** [Observations](https://neo.ssa.esa.int/search-for-asteroids?des=2023DW&tab=obs) **·** [Orbit](https://neo.ssa.esa.int/search-for-asteroids?des=2023DW&tab=orbprop) **·** [Physical properties](https://neo.ssa.esa.int/search-for-asteroids?des=2023DW&tab=physprops) **·** [Summary](https://neo.ssa.esa.int/search-for-asteroids?des=2023DW&tab=summary)

- [2023 DW](https://ssd.jpl.nasa.gov/tools/sbdb_lookup.html#/?sstr=54342500) at the *[JPL Small-Body Database](/source/JPL_Small-Body_Database)* - [Close approach](https://ssd.jpl.nasa.gov/tools/sbdb_lookup.html#/?sstr=54342500&view=C) **·** [Discovery](https://ssd.jpl.nasa.gov/tools/sbdb_lookup.html#/?sstr=54342500&view=D) **·** [Ephemeris](https://ssd.jpl.nasa.gov/horizons.cgi?find_body=1&body_group=sb&sstr=54342500) **·** [Orbit viewer](https://ssd.jpl.nasa.gov/tools/sbdb_lookup.html#/?sstr=54342500&view=V) **·** [Orbit parameters](https://ssd.jpl.nasa.gov/tools/sbdb_lookup.html#/?sstr=54342500&view=O) **·** [Physical parameters](https://ssd.jpl.nasa.gov/tools/sbdb_lookup.html#/?sstr=54342500&view=P)

- LOV (uncertainty region): [5000 clones calculated in SOLEX 12.1. Based on 60 observations through March 4](https://twitter.com/ptastro1/status/1632355512603009026) / [5000 clones, SOLEX 12.1, 69 observations through March 11](https://twitter.com/ptastro1/status/1634756097730027525) / [5000 clones, SOLEX 12.1, 104 observations through March 15](https://twitter.com/ptastro1/status/1636334615123357698) (ptastro1)

- Risk Corridor Calculations: [Piero_Sicoli](https://twitter.com/Piero_Sicoli/status/1631229473570914304) and [StevearenoBR](https://twitter.com/StevearenoBR/status/1631886371823534080)

- Discovery circumstances: [Alain Maury's blog](http://www.spaceobs.com/fr/Blog-de-Alain-Maury/2023-DW)

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Adapted from the Wikipedia article [2023 DW](https://en.wikipedia.org/wiki/2023_DW) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/2023_DW?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.