Lost minor planet

Short description: Asteroids whose orbits are not known accurately enough to find them again

More than 700,000 minor planets have been observed, many of which must be considered lost due to insufficient observational data.[1][2]

A minor planet is "lost" when contemporary observers cannot find it, because its location is too uncertain to target observations. This happens if the orbital elements of a minor planet are not known accurately enough, typically because the observation arc for the object is too short, or too few observations were made before the object became unobservable (e.g. too faint due to increasing distance, or too close to the Sun to view at night).

By some definitions thousands, if not tens of thousands, of mostly small observed minor planets are lost.[2] Some lost minor planets discovered in decades past cannot be found because the available observational data is insufficient for reliable orbit determination. With limited information astronomers cannot know where to look for the object at future dates.

Lost objects are sometimes recovered when serendipitously re-observed by a later astronomical survey. If the orbital elements of the newly found object are sufficiently close to those of the earlier lost object, the two may be equated. This can be established by calculating backwards the "new" object's orbit (once it is firmly known) and checking past positions against those previously recorded for the lost object. This usually greatly extends the object's arc length, thus fixing the orbit much more precisely. The back-orbit calculations are especially tricky for lost comets because their orbits can be affected by non-gravitational forces, such as emission of jets of gas from the comet nucleus. Many previously lost asteroids (a type of minor planet) were rediscovered in the 1980s and 1990s, but many minor planets are still lost.[3]

## Contents

* 1 Overview
* 2 20th-century recoveries
* 2.1 1970s
* 2.2 1980s and 1990s
* 3 20th-century discoveries that are still lost
* 4 21st century
* 5 See also
* 6 Notes
* 7 References
* 8 External links

## Overview

The orbits of kilometre class NEAs are generally well known, though a few have been lost. However, large numbers of smaller NEAs have highly uncertain orbits[4]

This is a small selection of some early lost or notable asteroids with their discovery and rediscovery dates. (A more detailed description for some of these minor planets can be found in the following sections.) The true number of lost asteroids may be over 150,000.[2] There are also about 30,000 unnumbered bodies with a condition code of U = 9, indicating the highest possible uncertainty of their orbit determination. Many of these bodies have been observed years if not decades ago and must be considered lost.[5][lower-alpha 1] There are also more than a thousand near-Earth objects (NEOs) with an observation arc of one or two days only.[6]

Designation  | Year of  | Notes  | MPC

|
|
|

discovery  | recovery
132 Aethra | 1873 | 1922[7] |  |
1892 X (330 Adalberta) | 1892 | false positive[lower-alpha 2] |  |
452 Hamiltonia | 1899 | 1981 |  |
473 Nolli | 1901 | 1987 |  |
12126 Chersidamas
(A904 RD) | 1904 | 1999 |  |
719 Albert | 1911 | 2000 |  |
724 Hapag | 1911 | 1988 |  |
843 Nicolaia | 1916 | 1981 |  |
878 Mildred | 1916 | 1991 |  |
1009 Sirene | 1923 | 1982[8] |  |
1026 Ingrid | 1923 | 1986 |  |
3789 Zhongguo | 1928 | 1986 |  |
1179 Mally | 1931 | 1986 |  |
1862 Apollo | 1932 | 1973 |  |
2101 Adonis | 1936 | 1977 |  |
69230 Hermes | 1937 | 2003[9][10] |  |
1537 Transylvania | 1940 | 1981 |  |
1922 Zulu | 1949 | 1974 |  |
(29075) 1950 DA | 1950 | 2000 |  |
1916 Boreas | 1953[9] | 1976 |  |
3494 Purple Mountain | 1962 | 1980 |  |
7796 Járacimrman | 1973 | 1996 |  |
1927 LA[11] | 1927 | false positive[12] | Observed 3 times between 1 June 1927 and 5 July 1927 | MPC
1991 BA | 1991 | still lost | Passed within a lunar distance of Earth | MPC
1995 SN55 | 1995 | 2020 | 3:5 resonant TNO initially thought to be a large centaur | MPC
2007 WD5 | 2007 | still lost | Passed close to Mars | MPC
6344 P-L | 1960 | 2007[13] | Potentially hazardous object; probably a dormant comet | MPC

## 20th-century recoveries

The number of asteroids that were only observed once and not re-observed grew throughout the 19th and 20th centuries, but improved telescopes, searches, and detection techniques led to resolution of most of these cases between 1970 and 2000. There are earlier examples also, such as 132 Aethra, which was lost between 1873 and 1922.[7]

### 1970s

Recovered body  | Description

|

1862 Apollo | Apollo is a Q-type asteroid, discovered by Karl Reinmuth in 1932, but lost and not recovered until 1973. Another Apollo asteroid is 2101 Adonis, discovered by Eugene Delporte in 1936 and lost until 1977 when it was rediscovered by Charles T. Kowal. It was also one of the first near-Earth asteroids to be discovered.
1916 Boreas | The Amor asteroid Boreas, provisionally designated 1953 RA, was discovered on 1 September 1953 by Sylvain Julien Victor Arend at the Royal Observatory of Belgium, and rediscovered in 1974 by Richard Eugene McCrosky, G. Schwartz and JH Bulger based on a predicted position by Brian G. Marsden.[9][14]
1922 Zulu | The outer main-belt asteroid, provisionally designated 1949 HC, was discovered on 25 April 1949 by Ernest Leonard Johnson at Johannesburg (UO).[9] It is one of very few asteroids located in the 2:1 mean-motion resonance with Jupiter.[15] This asteroid was lost shortly after discovery and only rediscovered in 1974 by Richard Eugene McCrosky, Cheng-yuan Shao and JH Bulger based on a predicted position by C. M. Bardwell of the Cincinnati Observatory.[9][14]

### 1980s and 1990s

Leif Kahl Kristensen at the University of Aarhus rediscovered 452 Hamiltonia and 1537 Transylvania, along with numerous other small objects, in 1981.[16] With the publication of these results, only nine numbered minor planets remained unobserved since their discoveries: 330 Adalberta, 473 Nolli, 719 Albert, 724 Hapag, 843 Nicolaia, 878 Mildred, 1009 Sirene, 1026 Ingrid, and 1179 Mally. All were recovered in the 1980s with the exception of 719 Albert, which was recovered in 2000.[16]

Recovered body  | Description

|

330 Adalberta | The object originally named Adalberta, provisionally designated 1892 X, turned out to be an erroneous observation. The designation was later reassigned to A910 CB, itself an asteroid first discovered in 1910 and seen again briefly in 1937, 1951, 1974, 1978 (twice) and 1980, receiving a new designation on each occasion, before it was recognised in 1982 that all of these observations were of the same object.[17]
843 Nicolaia | Nicolaia, provisionally designated 1916 AN, was rediscovered at the Heidelberg Astronomisches Rechen-Institut in 1981.[18]
473 Nolli | Nolli, provisionally designated 1901 GC, was discovered by Max Wolf on 13 February 1901, but it remained lost for many decades until it was recovered finally in 1987, 86 years later.[19]
724 Hapag | Hapag had first been found by Johann Palisa in 1911. It was given the provisional name 1911 NC, but was lost until it was rediscovered in 1988.[20][21]
719 Albert | Near-Earth asteroid 719 Albert (1911 MT) had also been found by Johann Palisa in 1911. Due to inaccuracies in its computed orbit, Albert was also lost and not recovered until 2000, when Jeffrey A. Larsen located it using data from the Spacewatch asteroid survey project. At the time of its rediscovery, Albert was the last remaining "lost asteroid" among those assigned numbers (since 69230 Hermes was not numbered until 2003).[21]
878 Mildred | Mildred, provisionally designated 1916 f, was originally discovered in 1916 using the 60-inch Hale telescope at the Californian Mount Wilson Observatory, but was subsequently lost until it was again observed on single nights in 1985 and 1991.[21][22]
1009 Sirene | Sirene, provisionally designated 1923 PE, was recovered in 1982 by J. Gibson using exposures form the Samuel Oschin Telescope at Palomar Observatory, and he revised its ephemeris.[8]
1026 Ingrid | Ingrid was discovered by Karl Reinmuth on 13 August 1923 and given the provisional designation 1923 NY.[9] It was reidentified in 1986 by Syuichi Nakano.[23]
1179 Mally | Mally was discovered by Max Wolf on 19 March 1931 and given the provisional designation 1931 FD.[9] It was rediscovered in 1986 by Lutz Schmadel, Richard Martin West and Hans-Emil Schuster.[24]

Other notable recoveries

* While studying in Chicago in 1928, Zhang Yuzhe discovered an asteroid that was given the provisional designation 1928 UF, and later the number 1125. He named it "China", or "中華" Zhōnghuá. However, this asteroid was not observed beyond its initial appearance and a precise orbit could not be calculated. In 1957, the Purple Mountain Observatory in China discovered a new asteroid, and with Zhang Yuzhe's agreement the new object 1957 UN1 was reassigned the official designation 1125 China in place of the lost 1928 UF. However, in 1986, the newly discovered object 1986 QK1 was confirmed to be a rediscovery of the original 1928 UF, and this object was named 3789 Zhongguo, which is also a name for China.[25]
* The near-Earth asteroid (29075) 1950 DA was discovered on 23 February 1950 by Carl Wirtanen at Lick Observatory. It was observed for 17 days and then lost, since not enough observations were made to allow its orbit to be plotted. It was then rediscovered on 31 December 2000. The chance it will impact Earth on 16 March 2880 is about 1 in 4,000, or 0.025 percent.[26]
* 7796 Járacimrman was discovered at the Czech Kleť Observatory on 16 January 1996 by Zdeněk Moravec and was designated 1996 BG. It was observed until April 1996 and then in June and July 1997. It was revealed, by precovery, to be a lost asteroid which had previously been observed twice: at the Brera-Merate Observatory in northern Italy on 12 December 1973 and at the Australian Mount Stromlo Observatory near Canberra, on 8 and 9 July 1990.

## 20th-century discoveries that are still lost

Below are some notable asteroids that were discovered during the 20th century and are lost as of 2025[update].

* 1979 XB: this 660-metre (2,170 ft) near-Earth asteroid was observed 18 times over a period of 3.9 days between 11 and 15 December 1979. As of 11 February 2025[update], it has the fourth-highest cumulative Palermo scale rating at −2.70, for possible impacts on Earth during four close approaches in 2056, 2086, 2102 and 2113.[27] Due to the large uncertainty in its orbital parameters,[28] the odds of the most likely impact in 2056 is only 1 in 5.3 million.[27]

## 21st century

Recently lost minor planets

* 6Q0B44E was discovered orbiting Earth in 2006.[29][30] Its properties were consistent with being an artificial piece of space debris,[30] so it was not given a minor planet designation. 6Q0B44E was lost in 2007, but another object XL8D89E was discovered on a very similar (but not identical) orbit in 2016. It is likely, though unproven, that both are the same object, which experiences non-gravitational acceleration (such as a slow gas leak) causing slight variations in its orbit.[31] XL8D89E was itself lost in 2018.[31]
* 2007 WD5 is a 50 m (160 ft) Apollo-class NEO and a Mars-crosser discovered on 20 November 2007, by Andrea Boattini of the Catalina Sky Survey.[32] Early observations of 2007 WD5 caused excitement amongst the scientific community when it was estimated as having as high as a 1 in 25 chance of colliding with Mars on 30 January 2008.[33] However, by 9 January 2008 additional observations allowed NASA's Near Earth Object Program (NEOP) to reduce the uncertainty region resulting in only a 1-in-10,000 chance of impact.[34] 2007 WD5 most likely passed Mars at a distance of 6.5 Mars radii. Due to this relatively small distance and the uncertainty level of the prior observations, the gravitational effects of Mars on its trajectory are unknown and, according to Steven Chesley of NASA's JPL-Near Earth Object program, 2007 WD5 is currently considered "lost".[33][35] The best fit trajectory had the asteroid passing within 21,000 km of Mars and only 16,000 km from its moon Deimos.[34][36]
* In 2007, the object 2007 RR9 was found to be the near-Earth asteroid 6344 P–L, lost since 1960. It is a potentially hazardous object and probably a dormant comet.[13]
* 2020 MK53 is a lost trans-Neptunian object discovered on 22 June 2020 and announced on 7 April 2023 (MPS 1836391, MPO 735634) by the New Horizons KBO Search team[37] using the 8.2-meter Subaru Telescope at Mauna Kea Observatory in Hawaii.[38] Its orbit is highly uncertain because it was observed for only three days, which is not long enough to determine an orbit accurately.[39][38] Its distance from the Sun might be around 160 astronomical units according to orbital calculations, which would make it the farthest known Solar System object from the Sun.[40] However, the uncertainty in its distance from the Sun ranges from ±4 AU to over ±20,000 AU, depending on the method of calculation.[39]

## See also

* List of unnumbered minor planets § 1900–1979
* Lost comet
* Precovery

## Notes

1. ↑ Note: this query at JPL's Small-Body Database lists all unnamed asteroids with an orbital uncertainty of 9, which also includes recently discovered bodies. The lost minor planets appear first, since the table is sorted by the body's first observation date.
2. ↑ On 18 March 1892, a body discovered by Max Wolf with the provisional designation 1892 X was originally named 330 Adalberta, but was lost and never recovered. In 1982, it was determined that Wolf erroneously measured two images of stars, not asteroids. Because it was a false positive and the body never existed, the named designation 330 Adalberta was reused for another asteroid, A910 CB, discovered in 1910.

## References

1. ↑ "Running Tallies – Minor Planets Discovered". IAU Minor Planet Center. http://www.minorplanetcenter.net/.
2. ↑ 2.0 2.1 2.2 Blair, Edward C. (2002). Asteroids: overview, abstracts, and bibliography (2002), by Edward C. Blair, Page 177. Nova Publishers. ISBN 9781590334829. https://books.google.com/books?id=oa289IxCvAAC&pg=PA177. Retrieved 2013-07-23.
3. ↑ Lost asteroid. (2009). In Encyclopædia Britannica. Retrieved 27 February 2009, from Encyclopædia Britannica Online: http://www.britannica.com/topic/lost-asteroid
4. ↑ "Orbits for Near Earth Asteroids (NEAs)". International Astronomical Union. https://www.minorplanetcenter.net/iau/MPCORB/NEA.txt.
* "Export Format for Minor-Planet Orbits". https://www.minorplanetcenter.net/iau/info/MPOrbitFormat.html.
5. ↑ "JPL Small-Body Database Search Engine: Unnumbered asteroids with condition code of 9, oldest first obs. shown first". JPL Solar System Dynamics. http://ssd.jpl.nasa.gov/sbdb_query.cgi?obj_group=all;obj_kind=ast;obj_numbered=unn;OBJ_field=0;ORB_field=0;c1_group=ORB;c1_item=Cq;c1_op==;c1_value=9;table_format=HTML;max_rows=25;format_option=comp;c_fields=AcCqCkCnCl;c_sort=ClA;.cgifields=format_option;.cgifields=obj_kind;.cgifields=obj_group;.cgifields=obj_numbered;.cgifields=ast_orbit_class;.cgifields=table_format;.cgifields=com_orbit_class&query=1.
6. ↑ "JPL Small-Body Database Search Engine: NEOs with observation arc of 1 or 2 days only". JPL Small-Body Database. http://ssd.jpl.nasa.gov/sbdb_query.cgi?obj_group=neo;obj_kind=ast;obj_numbered=all;OBJ_field=0;ORB_field=0;c1_group=ORB;c1_item=Ck;c1_op=<=;c1_value=2;table_format=HTML;max_rows=20;format_option=comp;query=Generate Table;c_fields=AcAgCkCnCqCl;c_sort=ClA;.cgifields=format_option;.cgifields=ast_orbit_class;.cgifields=table_format;.cgifields=obj_kind;.cgifields=obj_group;.cgifields=obj_numbered;.cgifields=com_orbit_class&page=1.
7. ↑ 7.0 7.1 Price, Fred W. (2000-10-26). The planet observer's handbook (2000), By Fred William Price, Page 192. (Google Books 2010). Cambridge University Press. ISBN 9780521789813. https://books.google.com/books?id=GnrAVhVZ3wMC&pg=PA192. Retrieved 2013-07-23.
8. ↑ 8.0 8.1 Gibson, J.; Kristensen, L. K. (22 July 1982). Marsden, B. G. ed. "(1009) Sirene Gibson". IAU Circular (Central Bureau for Astronomical Telegrams) (3714). Bibcode: 1982IAUC.3714....1G. http://www.cbat.eps.harvard.edu/iauc/03700/03714.html.
9. ↑ 9.0 9.1 9.2 9.3 9.4 9.5 9.6 "Discovery Circumstances: Numbered Minor Planets (1)–(5000)". IAU: Minor Planet Center. http://www.minorplanetcenter.net/iau/lists/NumberedMPs000001.html.
10. ↑ "MPEC 2003-T74: 1937 UB (HERMES)". Minorplanetcenter.net. http://www.minorplanetcenter.net/mpec/K03/K03T74.html.
11. ↑ "1927 LA". Minor Planet Center. http://www.minorplanetcenter.net/db_search/show_object?utf8=✓&object_id=1927+LA.
12. ↑ Meyer, Maik (2 March 2022). "Re: Identification of old discoveries". https://groups.io/g/mpml/message/37391.
13. ↑ 13.0 13.1 "Long-Lost, Dangerous Asteroid Is Found Again – ScienceDaily (15 Oct. 2007)". Sciencedaily.com. 2007-10-15. https://www.sciencedaily.com/releases/2007/10/071011213216.htm.
14. ↑ 14.0 14.1 Brian G. Marsden (24 October 1974). "International Astronomical Union Circular 2710". Central Bureau for Astronomical Telegrams. http://www.cbat.eps.harvard.edu/iauc/02700/02710.html.
15. ↑ Roig; Nesvorny, D.; Ferraz-Mello, S. (2002). "Asteroids in the 2 : 1 resonance with Jupiter: dynamics and size distribution". Monthly Notices of the Royal Astronomical Society 335 (2): 417–431. doi:10.1046/j.1365-8711.2002.05635.x. Bibcode: 2002MNRAS.335..417R.
16. ↑ 16.0 16.1 Kristensen, L. K.; Gibson, J.; Shao, C.-Y.; Bowell, E.; Marsden, B. G. (April 1981). "(1537) Transylvania and (452) Hamiltonia". IAU Circ. (3595): 1. Bibcode: 1981IAUC.3595....1K. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=1981IAUC.3595....1K. Retrieved 24 May 2016.
17. ↑ "JPL Small-Body Database Browser: 330 Adalberta (A910 CB)". Jet Propulsion Laboratory. http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2000330.
18. ↑ Wiley Interscience Recovery of the Long Lost Minor Planet (843) Nicolaia after 65 Years (Astronomisches Rechen-Institut Heidelberg – Mitteilungen Serie B) L. D. Schmadel 1 *, L. Kohoutek 2 * Heidelberg Astronomisches Rechen-Institut
19. ↑ IAUC 4292
20. ↑ Schmadel, Lutz D. (1997). Dictionary of Minor Planet Names. Springer Science+Business Media. p. 70. ISBN 978-0-354-06174-2. https://www.scribd.com/doc/9378417/Dictionary-of-Minor-Planet-Names.
21. ↑ 21.0 21.1 21.2 Cowen, Ron (20 May 2000). "Astronomers Rediscover Long-Lost Asteroid". Science News 157 (21). http://sciencenewsmagazine.org/view/generic/id/489/title/Astronomers_rediscover_long-lost_asteroid.
22. ↑ "(878) MILDRED". IAU Circular (5275). 25 May 1991. http://www.cbat.eps.harvard.edu/iauc/05200/05275.html.
23. ↑ Brian G. Marsden (8 December 1986). "International Astronomical Union Circular 4281". Central Bureau for Astronomical Telegrams. http://www.cbat.eps.harvard.edu/iauc/04200/04281.html.
24. ↑ Brian G. Marsden (5 December 1986). "International Astronomical Union Circular 4278". Central Bureau for Astronomical Telegrams. http://www.cbat.eps.harvard.edu/iauc/04200/04278.html.
25. ↑ Schmadel, Lutz D. (2007). "(3789) Zhongguo". Dictionary of Minor Planet Names – (3789) Zhongguo. Springer Berlin Heidelberg. p. 320. doi:10.1007/978-3-540-29925-7_3783. ISBN 978-3-540-00238-3.
26. ↑ "Earth Impact Risk Summary: 29075 1950 DA". NASA/JPL Near-Earth Object Program Office. 26 November 2013. http://neo.jpl.nasa.gov/risk/a29075.html.
27. ↑ 27.0 27.1 "Earth Impact Risk Summary: 1979 XB". NASA/JPL CNEOS. https://cneos.jpl.nasa.gov/sentry/details.html#?des=1979 XB.
28. ↑ "Small-Body Database Lookup: 1979 XB". NASA/JPL SSD. https://ssd.jpl.nasa.gov/tools/sbdb_lookup.html#/?sstr=1979 XB&view=OPC.
29. ↑ "Spacewatch". The Guardian. 6 September 2006.
30. ↑ 30.0 30.1 Gray, Bill (3 September 2006). "Pseudo-MPEC for 6Q0B44E". http://home.gwi.net/~pluto/mpecs/6q0b44e.htm.
31. ↑ 31.0 31.1 "Pseudo-MPEC for XL8D89E". 6 November 2018. https://www.projectpluto.com/pluto/mpecs/xl8d89e.htm. "This is probably the same object as 6Q0B44E"
32. ↑ "JPL Small-Body Database Browser: 2007 WD5". http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2007wd5.
33. ↑ 33.0 33.1 Don Yeomans, Paul Chodas and Steve Chesley (28 December 2007). "Mars Impact Probability Increases to 4 Percent". NASA/JPL Near-Earth Object Program Office. http://neo.jpl.nasa.gov/news/news153.html.
34. ↑ 34.0 34.1 Steve Chesley, Paul Chodas and Don Yeomans (9 January 2008). "2007 WD5 Mars Collision Effectively Ruled Out – Impact Odds now 1 in 10,000". NASA/JPL Near-Earth Object Program Office. http://neo.jpl.nasa.gov/news/news156.html.
35. ↑ Lakdawalla, Emily (4 February 2008). "WD5 most likely missed Mars, but we may never know". http://www.planetary.org/blog/article/00001316/.
36. ↑ "Horizons Archive Mars/Earth 2003/2008". http://home.comcast.net/~kpheider/2007WD5.txt. (Soln.date: 2007-Dec-23)
37. ↑ "Subaru Telescope and New Horizons Explore the Outer Solar System". Subaru Telescope. https://subarutelescope.org/en/news/topics/2020/07/14/2873.html. Retrieved 10 September 2023.
38. ↑ 38.0 38.1 "2020 MK53". Minor Planet Center. International Astronomical Union. https://www.minorplanetcenter.net/db_search/show_object?object_id=2020+MK53. Retrieved 9 September 2023.
39. ↑ 39.0 39.1 C. de la Fuente Marcos; R. de la Fuente Marcos (1 January 2024). "Past the outer rim, into the unknown: structures beyond the Kuiper Cliff". Monthly Notices of the Royal Astronomical Society Letters 527 (1): L110–L114. doi:10.1093/mnrasl/slad132. Bibcode: 2024MNRAS.527L.110D. https://academic.oup.com/mnrasl/article-abstract/527/1/L110/7280408. Retrieved 28 September 2023.
40. ↑ "JPL Horizons On-Line Ephemeris for 2020 MK53". JPL Horizons On-Line Ephemeris System. Jet Propulsion Laboratory. http://ssd.jpl.nasa.gov/horizons.cgi?find_body=1&body_group=ab&sstr=2020+MK53. Retrieved 9 September 2023. Ephemeris Type: VECTORS, Target Body: Asteroid (2020 MK53)

## External links

* Minor Planet Center: Asteroid Hazards, Part 2: The Challenge of Detection on YouTube (min. 7:14)
* Minor Planet Center: Asteroid Hazards, Part 3: Finding the Path on YouTube (min. 5:38)

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