Yrjö Väisälä Guide, Meaning , Facts, Information and Description
Yrjö Väisälä (September 6, 1891 - July 21, 1971) was a Finnish astronomer and physicist.[A note on dates: the birth date is most likely a Gregorian calendar date, because although Finland was part of Russia at the time and Russia used the Julian calendar until 1918, the Gregorian calendar continued in official use in Finland because Finland had been part of Sweden when Sweden had converted to the Gregorian calendar in 1753.]
His main contributions were in the field of optics. He developed several methods for measuring the quality of optical elements. This allowed the construction of some of the earliest high-quality Schmidt telescopes. Some historians even claim that Väisälä invented the Schmidt telescope independently, but this has remained an open question. The Schmidt telescopes he built were used at the University of Turku for searches of asteroids and comets. His research group discovered several comets and more than 800 asteroids.
Notably discovered the periodic comets 40P/Vaisala and 139P/Vaisala-Oterma (the latter co-discovered with Liisi Oterma).
A crater on the Moon is named after him, and so is the asteroid 1573 Väisälä.
| 1391 Carelia | February 16 1936 |
| 1398 Donnera | August 26 1936 |
| 1405 Sibelius | September 12 1936 |
| 1406 Komppa | September 13 1936 |
| 1407 Lindelöf | November 21 1936 |
| 1421 Esperanto | March 18 1936 |
| 1424 Sundmania | January 9 1937 |
| 1446 Sillanpää | January 26 1938 |
| 1447 Utra | January 26 1938 |
| 1448 Lindbladia | February 16 1938 |
| 1449 Virtanen | February 20 1938 |
| 1450 Raimonda | February 20 1938 |
| 1451 Granö | February 22 1938 |
| 1453 Fennia | March 8 1938 |
| 1454 Kalevala | February 16 1936 |
| 1460 Haltia | November 24 1937 |
| 1462 Zamenhof | February 6 1938 |
| 1463 Nordenmarkia | February 6 1938 |
| 1471 Tornio | September 16 1938 |
| 1472 Muonio | October 18 1938 |
| 1473 Ounas | October 22 1938 |
| 1477 Bonsdorffia | February 6 1938 |
| 1478 Vihuri | February 6 1938 |
| 1479 Inkeri | February 16 1938 |
| 1480 Aunus | February 18 1938 |
| 1483 Hakoila | February 24 1938 |
| 1488 Aura | December 15 1938 |
| 1492 Oppolzer | March 23 1938 |
| 1494 Savo | September 16 1938 |
| 1495 Helsinki | September 21 1938 |
| 1496 Turku | September 22 1938 |
| 1497 Tampere | September 22 1938 |
| 1498 Lahti | September 16 1938 |
| 1499 Pori | October 16 1938 |
| 1500 Jyväskylä | October 16 1938 |
| 1503 Kuopio | December 15 1938 |
| 1518 Rovaniemi | October 15 1938 |
| 1519 Kajaani | October 15 1938 |
| 1520 Imatra | October 22 1938 |
| 1521 Seinäjoki | October 22 1938 |
| 1523 Pieksämäki | January 18 1939 |
| 1524 Joensuu | September 18 1939 |
| 1525 Savonlinna | September 18 1939 |
| 1526 Mikkeli | October 7 1939 |
| 1527 Malmquista | October 18 1939 |
| 1529 Oterma | January 26 1938 |
| 1530 Rantaseppä | September 16 1938 |
| 1532 Inari | September 16 1938 |
| 1533 Saimaa | January 19 1939 |
| 1534 Näsi | January 20 1939 |
| 1535 Päijänne | September 9 1939 |
| 1536 Pielinen | September 18 1939 |
| 1541 Estonia | February 12 1939 |
| 1542 Schalén | August 26 1941 |
| 1548 Palomaa | March 26 1935 |
| 1549 Mikko | April 2 1937 |
| 1551 Argelander | February 24 1938 |
| 1552 Bessel | February 24 1938 |
| 1567 Alikoski | April 22 1941 |
| 1631 Kopff | October 11 1936 |
| 1646 Rosseland | January 19 1939 |
| 1656 Suomi | March 11 1942 |
| 1659 Punkaharju | December 28 1940 |
| 1677 Tycho Brahe | September 6 1940 |
| 1678 Hveen | December 28 1940 |
| 1696 Nurmela | March 18 1939 |
| 1699 Honkasalo | August 26 1941 |
| 1723 Klemola | March 18 1936 |
| 1740 Paavo Nurmi | October 18 1939 |
| 1757 Porvoo | March 17 1939 |
| 1883 Rimito | December 4 1942 |
| 1928 Summa | September 21 1938 |
| 1929 Kollaa | January 20 1939 |
| 1947 Iso-Heikkilä | March 4 1935 |
| 2020 Ukko | March 18 1936 |
| 2067 Aksnes | February 23 1936 |
| 2091 Sampo | April 26 1941 |
| 2096 Väinö | October 18 1939 |
| 2194 Arpola | April 3 1940 |
| 2204 Lyyli | March 3 1943 |
| 2243 Lönnrot | September 25 1941 |
| 2258 Viipuri | October 7 1939 |
| 2292 Seili | September 7 1942 |
| 2299 Hanko | September 25 1941 |
| 2333 Porthan | March 3 1943 |
| 2379 Heiskanen | September 21 1941 |
| 2397 Lappajärvi | February 22 1938 |
| 2454 Olaus Magnus | September 21 1941 |
| 2464 Nordenskiöld | January 19 1939 |
| 2479 Sodankylä | February 6 1942 |
| 2486 Metsähovi | March 22 1939 |
| 2502 Nummela | March 3 1943 |
| 2512 Tavastia | April 3 1940 |
| 2535 Hämeenlinna | February 17 1939 |
| 2638 Gadolin | September 19 1939 |
| 2639 Planman | April 9 1940 |
| 2678 Aavasaksa | February 24 1938 |
| 2679 Kittisvaara | October 7 1939 |
| 2690 Ristiina | February 24 1938 |
| 2715 Mielikki | October 22 1938 |
| 2716 Tuulikki | October 7 1939 |
| 2733 Hamina | February 22 1938 |
| 2737 Kotka | February 22 1938 |
| 2750 Loviisa | December 30 1940 |
| 2802 Weisell | January 19 1939 |
| 2820 Iisalmi | September 8 1942 |
| 2826 Ahti | October 18 1939 |
| 2885 Palva | October 7 1939 |
| 2898 Neuvo | February 20 1938 |
| 2962 Otto | December 28 1940 |
| 2972 Niilo | October 7 1939 |
| 3037 Alku | January 17 1944 |
| 3099 Hergenrother | April 3 1940 |
| 3166 Klondike | March 30 1940 |
| 3212 Agricola | February 19 1938 |
| 3223 Forsius | September 7 1942 |
| 3272 Tillandz | February 24 1938 |
| 3281 Maupertuis | February 24 1938 |
| 3522 Becker | September 21 1941 |
| 3606 Pohjola | September 19 1939 |
| 3897 Louhi | September 8 1942 |
| 4181 Kivi | February 24 1938 |
| 4266 Waltari | December 28 1940 |
| 4512 Sinuhe | January 20 1939 |
| 5073 Junttura | March 3 1943 |
| (5153) 1940 GO | April 9 1940 |
| (6073) 1939 UB | October 18 1939 |
| 6572 Carson | September 22 1938 |
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