Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Name | Latitude | Longitude | Diameter (km) | Year named |
| --- | --- | --- | --- | --- |
| Alpan Fluctus | 7.5S | 349.0E | 500.0 | 1997.0 |
| Argimpasa Fluctus | 0.0N | 175.5E | 950.0 | 1997.0 |
| Arubani Fluctus | 55.0S | 132.0E | 620.0 | 1997.0 |
| Bolotnitsa Fluctus | 50.0N | 160.0E | 1100.0 | 1997.0 |
| Cavillaca Fluctus | 72.0S | 340.0E | 800.0 | 1997.0 |
| Darago Fluctus | 11.5S | 313.5E | 775.0 | 1994.0 |
| Djabran Fluctus | 43.5S | 183.0E | 300.0 | 1997.0 |
| Djata Fluctus | 66.5N | 307.5E | 280.0 | 1997.0 |
| Dotetem Fluctus | 6.0S | 177.5E | 530.0 | 1997.0 |
| Eriu Fluctus | 37.0S | 357.0E | 600.0 | 1991.0 |
| Heloha Fluctus | 77.0 N | 344.0 E | 375.0 | 2009.0 |
| Henwen Fluctus | 20.5S | 179.9E | 485.0 | 1994.0 |
| Hikuleo Fluctus | 52.5N | 208.0E | 600.0 | 1997.0 |
| Ilaheva Fluctus | 42.5S | 84.0E | 900.0 | 2000.0 |
| Itoki Fluctus | 6.0S | 229.0E | 900.0 | 2003.0 |
| Juturna Fluctus | 76.0S | 350.0E | 900.0 | 1997.0 |
| Kaapaau Fluctus | 66.5S | 181.0E | 350.0 | 2000.0 |
| Kaiwan Fluctus | 45.5S | 358.0E | 1200.0 | 1991.0 |
| Kasogonaga Fluctus | 18.0S | 268.0E | 850.0 | 2000.0 |
| Koti Fluctus | 12.5N | 318.0E | 400.0 | 1997.0 |
| Kunkubey Fluctus | 50.0S | 207.0E | 350.0 | 2000.0 |
| Mamapacha Fluctus | 60.0N | 185.0E | 900.0 | 1997.0 |
| Medb Fluctus | 56.0S | 127.0E | 350.0 | 1997.0 |
| Merisa Fluctus | 20.5N | 9.0E | 630.0 | 2000.0 |
| Mert Fluctus | 50.5S | 230.5E | 250.0 | 2000.0 |
| Mortim-Ekva Fluctus | 1.0N | 334.0E | 1250.0 | 2000.0 |
| Mylitta Fluctus | 54.0S | 355.5E | 1250.0 | 1991.0 |
| Nambubi Fluctus | 61.0S | 135.0E | 850.0 | 1997.0 |
| Naunet Fluctus | 81.0S | 136.0E | 200.0 | 2000.0 |
| Neago Fluctu-s | 49.3N | 351.0E | 0.0 | 1991.0 |
| Nekhebet Fluctus | 0.0N | 35.0E | 400.0 | 1997.0 |
| Ney-Anki Fluctus | 37.0S | 105.0E | 950.0 | 2000.0 |
| Ningyo Fluctus | 5.5S | 206.0E | 970.0 | 1994.0 |
| Oilule Fluctus | 22.0S | 79.0E | 900.0 | 2000.0 |
| Ovda Fluctus | 6.1S | 95.5E | 310.0 | 1994.0 |
| Praurime Fluctus | 16.0N | 154.0E | 750.0 | 1997.0 |
| Rafara Fluctus | 65.0S | 159.0E | 700.0 | 1997.0 |
| Sicasica Fluctus | 52.0S | 180.4E | 175.0 | 1994.0 |
| Sobra Fluctus | 6.0N | 248.0E | 700.0 | 1997.0 |
| Sonmunde Fluctus | 60.0S | 120.0E | 400.0 | 1997.0 |
| Strenia Fluctus | 41.0N | 250.0E | 490.0 | 1997.0 |
| Syvne Fluctus | 36.0S | 72.0E | 900.0 | 2000.0 |
| Tie Fluctus | 21.0N | 159.0E | 550.0 | 2003.0 |
| Tsunghi Fluctus | 67.0S | 130.0E | 800.0 | 1997.0 |
| Turgmam Fluctus | 56.0N | 220.0E | 500.0 | 1997.0 |
| Ubastet Fluctus | 48.0S | 27.0E | 550.0 | 1997.0 |
| Uilata Fluctus | 17.0N | 314.0E | 700.0 | 1997.0 |
| Uzume Fluctus | 28.6N | 220.3E | 700.0 | 1997.0 |
| Vut-Ami Fluctus | 38.0S | 67.0E | 1300.0 | 2000.0 |
| Yagami Fluctus | 80.6S | 152.0E | 260.0 | 2000.0 |
| Zipaltonal Fluctus | 37.7N | 251.3E | 290.0 | 1997.0 |
Question:
What's the longitude named zipaltonal fluctus in 1997 with a diameter smaller than 490?
Answer:
251.3E