 | 2021 PH27 is a near-Earth asteroid of the Atira group. It was discovered by Scott Sheppard using the Dark Energy Survey's DECam imager at NOIRLab's Cerro... 16 KB (1,300 words) - 21:35, 14 January 2024 |
 | to produce substantial evidence on vulcanoids. On August 13, 2021, an asteroid, 2021 PH27, was discovered with a perihelion well within the orbit of Mercury... 22 KB (2,535 words) - 11:17, 15 April 2024 |
 | movements of Vulcan Tyche (hypothetical planet) Vulcan (Star Trek) Vulcanoid 2021 PH27, an Atira asteroid with an intra-Mercurian perihelion, the smallest semi-major... 23 KB (2,933 words) - 23:39, 28 April 2024 |
 | significant scientific events that occurred or were scheduled to occur in 2021. 1 July Construction begins on the Square Kilometre Array, with first light... 297 KB (38,840 words) - 17:09, 25 April 2024 |
significant events in science that have occurred in the first quarter of 2021. 1 January – Beginning of the implementation of Plan S, an initiative for... 139 KB (13,103 words) - 16:21, 19 April 2024 |
significant events in science that have occurred in the second quarter of 2021. 2 April – Scientists report that the event that caused the mass-extinction... 126 KB (11,867 words) - 06:26, 15 April 2024 |
Scott S. Sheppard (category Articles lacking reliable references from August 2021) (2018) S/2018 J 4 (2018) S/2021 J 1 (2021) S/2021 J 2 (2021) S/2021 J 3 (2021) S/2021 J 4 (2021) S/2021 J 5 (2021) S/2021 J 6 (2021) S/2022 J 1 (2022) S/2022... 16 KB (1,331 words) - 05:18, 4 April 2024 |
Notable discoveries from this survey include the Atira asteroids 2021 LJ4 and 2021 PH27, the latter of which holds the record for the shortest orbital period... 15 KB (990 words) - 10:53, 4 January 2024 |
 | 2019 LF6 is a near-Earth object of the Atira group. After 2021 PH27, it has the second-smallest semi-major axis among the known asteroids (0.555 AU),... 6 KB (399 words) - 21:35, 14 January 2024 |
 | Earth during 2021. "2021 SG". Minor Planet Center. International Astronomical Union. Retrieved 11 December 2021. "MPEC 2021-S24 : 2021 SG". Minor Planet... 5 KB (239 words) - 21:35, 14 January 2024 |
 | S. Sheppard MPC · JPL 2021 PB2 0.610 0.7174 0.825 0.1501 24.83 222 3392 18.8 620 Zwicky Transient Facility MPC · JPL 2021 PH27 0.133 0.4617 0.790 0.7117... 25 KB (1,808 words) - 21:56, 9 April 2024 |
2021 DW1 is a small Apollo near-Earth asteroid discovered on 16 February 2021 by the Pan-STARRS 1 survey at Haleakala Observatory, Hawaii. On 4 March... 6 KB (312 words) - 18:19, 27 November 2023 |
2021 AV7 is a near-Earth asteroid of the Apollo group, discovered by astronomers Alain Maury and G. Attard at San Pedro de Atacama, Chile on 15 January... 9 KB (700 words) - 23:18, 25 January 2024 |
 | (679648) 2019 XS (category Use dmy dates from October 2021) 1.493 lunar distances (574,000 km; 357,000 mi) from Earth on 9 November 2021 at 03:48 UTC, after which observations were checked by the International... 8 KB (586 words) - 16:20, 23 April 2024 |
 | (231937) 2001 FO32 (category Use dmy dates from September 2021) Mexico on 23 March 2001. The asteroid safely passed by Earth on 21 March 2021 16:03 UTC from a closest approach distance of 0.0135 AU (2.02 million km;... 15 KB (1,373 words) - 23:16, 25 January 2024 |