| Neptune Ephemeris for the next 18 months |  | | Date | Elongation | Transit | mV | Diameter | Illumination | Illum Arcsec | Tilt | | | 2020-04-01 | 22.5° | 51° | +8.0 mV | 2.21" | 100 % | 4 | -24.2° SP | | 2020-05-01 | 50.9° | 52° | +7.9 mV | 2.23" | 100 % | 4 | -23.9° SP | | 2020-06-01 | 80.1° | 52° | +7.9 mV | 2.27" | 100 % | 4 | -23.7° SP | | 2020-07-01 | 108.7° | 52° | +7.9 mV | 2.31" | 100 % | 4 | -23.6° SP | | 2020-08-01 | 138.6° | 52° | +7.8 mV | 2.34" | 100 % | 4 | -23.7° SP | | 2020-09-01 | 169.1° | 51° | +7.8 mV | 2.36" | 100 % | 4 | -23.9° SP | | 2020-10-01 | 160.7° | 51° | +7.8 mV | 2.36" | 100 % | 4 | -24.1° SP | | 2020-11-01 | 129.4° | 51° | +7.8 mV | 2.33" | 100 % | 4 | -24.3° SP | | 2020-12-01 | 98.9° | 51° | +7.9 mV | 2.29" | 100 % | 4 | -24.4° SP | | 2021-01-01 | 67.7° | 51° | +7.9 mV | 2.25" | 100 % | 4 | -24.3° SP | | 2021-02-01 | 36.9° | 51° | +8.0 mV | 2.22" | 100 % | 4 | -24.1° SP | | 2021-03-01 | 9.7° | 52° | +8.0 mV | 2.21" | 100 % | 4 | -23.8° SP | | 2021-04-01 | 20.1° | 52° | +8.0 mV | 2.21" | 100 % | 4 | -23.5° SP | | 2021-05-01 | 48.5° | 52° | +7.9 mV | 2.23" | 100 % | 4 | -23.2° SP | | 2021-06-01 | 77.7° | 53° | +7.9 mV | 2.27" | 100 % | 4 | -23.0° SP | | 2021-07-01 | 106.2° | 53° | +7.9 mV | 2.31" | 100 % | 4 | -23.0° SP | | 2021-08-01 | 136.1° | 53° | +7.8 mV | 2.34" | 100 % | 4 | -23.0° SP | | 2021-09-01 | 166.6° | 52° | +7.8 mV | 2.36" | 100 % | 4 | -23.2° SP |
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| Next 5 Neptune Oppositions | | All Neptune Oppositions 2000 - 2049 AD | | | Date | Transit | mV | Diameter | Illum Arcsec | Tilt | | | 2019-09-10 | 50° alt | +7.8 mV | 2.36" | 4 | -23.2° SP | | 2020-09-11 | 51° alt | +7.8 mV | 2.36" | 4 | -23.2° SP | | 2021-09-14 | 52° alt | +7.8 mV | 2.36" | 4 | -23.2° SP | | 2022-09-16 | 53° alt | +7.8 mV | 2.36" | 4 | -23.2° SP | | 2023-09-19 | 54° alt | +7.8 mV | 2.36" | 4 | -23.2° SP | | 2024-09-21 | 55° alt | +7.8 mV | 2.36" | 4 | -23.2° SP | | 2025-09-23 | 57° alt | +7.8 mV | 2.36" | 4 | -23.2° SP | | 2026-09-26 | 57° alt | +7.8 mV | 2.36" | 4 | -23.2° SP | | 2027-09-28 | 57° alt | +7.8 mV | 2.37" | 4 | -23.2° SP | | 2028-09-30 | 58° alt | +7.8 mV | 2.37" | 4 | -23.2° SP |
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| Upcoming Neptune Planetary Conjunctions | | | Date | Separation | Solar Elong | Closer Planet | Size | Illum | Further Planet | Size | Illum | | | 2000-02-22 | 0.49° | 28° | Venus | 11.6" | 89% | Neptune | 2.2" | 100% | | 2002-02-24 | 0.49° | 26° | Mercury | 6.7" | 64% | Neptune | 2.2" | 100% | | 2003-03-12 | 0.18° | 40° | Venus | 14.9" | 74% | Neptune | 2.2" | 100% | | 2008-01-22 | 0.27° | 19° | Mercury | 7.1" | 53% | Neptune | 2.2" | 100% | | 2009-05-27 | 0.39° | 100° | Jupiter | 41.1" | 99% | Neptune | 2.3" | 100% | | 2011-03-27 | 0.15° | 36° | Venus | 13.6" | 79% | Neptune | 2.2" | 100% | | 2013-02-04 | 0.41° | 16° | Mars | 4.1" | 99% | Neptune | 2.2" | 100% | | 2013-02-07 | 0.41° | 14° | Mercury | 5.6" | 85% | Neptune | 2.2" | 100% | | 2015-01-20 | 0.21° | 36° | Mars | 4.6" | 95% | Neptune | 2.2" | 100% | | 2016-03-20 | 0.49° | 20° | Venus | 10.6" | 94% | Neptune | 2.2" | 100% | | 2017-01-01 | 0.02° | 59° | Mars | 5.7" | 90% | Neptune | 2.2" | 100% | | 2017-01-12 | 0.36° | 47° | Venus | 24.5" | 51% | Neptune | 2.2" | 100% | | 2018-02-25 | 0.43° | 7° | Mercury | 5.1" | 97% | Neptune | 2.2" | 100% | | 2018-12-07 | 0.03° | 88° | Mars | 8.8" | 86% | Neptune | 2.3" | 100% | | 2019-04-02 | 0.38° | 25° | Mercury | 9.1" | 32% | Neptune | 2.2" | 100% | | 2019-04-10 | 0.29° | 33° | Venus | 12.6" | 83% | Neptune | 2.2" | 100% | | 2020-01-27 | 0.07° | 40° | Venus | 15" | 75% | Neptune | 2.2" | 100% | | 2021-03-14 | 0.37° | 3° | Venus | 9.7" | 100% | Neptune | 2.2" | 100% | | 2022-04-12 | 0.10° | 29° | Jupiter | 33.8" | 100% | Neptune | 2.2" | 100% | | 2022-04-27 | 0.01° | 43° | Venus | 17.1" | 66% | Neptune | 2.2" | 100% | | 2023-02-15 | 0.02° | 28° | Venus | 11.6" | 89% | Neptune | 2.2" | 100% | | 2023-03-16 | 0.38° | 2° | Mercury | 5" | 100% | Neptune | 2.2" | 100% | | 2024-03-08 | 0.44° | 9° | Mercury | 5.3" | 95% | Neptune | 2.2" | 100% | | 2024-04-03 | 0.26° | 16° | Venus | 10.2" | 96% | Neptune | 2.2" | 100% | | 2024-04-29 | 0.04° | 40° | Mars | 4.7" | 94% | Neptune | 2.2" | 100% | | 2027-04-11 | 0.21° | 17° | Mercury | 5.4" | 85% | Neptune | 2.2" | 100% | | 2027-04-24 | 0.24° | 29° | Venus | 11.7" | 87% | Neptune | 2.2" | 100% | | 2029-03-27 | 0.35° | 2° | Mercury | 5" | 100% | Neptune | 2.2" | 100% | | 2030-05-12 | 0.30° | 40° | Venus | 15.1" | 73% | Neptune | 2.2" | 100% | | 2033-05-25 | 0.24° | 46° | Venus | 25" | 47% | Neptune | 2.2" | 100% | | 2034-04-16 | 0.23° | 6° | Mercury | 5.1" | 97% | Neptune | 2.2" | 100% | | 2035-05-08 | 0.03° | 25° | Venus | 11.1" | 91% | Neptune | 2.2" | 100% | | 2038-05-27 | 0.30° | 37° | Venus | 13.7" | 78% | Neptune | 2.2" | 100% | | 2039-05-05 | 0.35° | 13° | Mercury | 5.3" | 89% | Neptune | 2.2" | 100% | | 2039-06-23 | 0.39° | 59° | Mars | 5.8" | 89% | Neptune | 2.3" | 100% | | 2043-05-22 | 0.29° | 21° | Venus | 10.6" | 93% | Neptune | 2.2" | 100% | | 2044-05-23 | 0.49° | 20° | Mercury | 6" | 73% | Neptune | 2.2" | 100% | | 2046-06-11 | 0.11° | 33° | Venus | 12.6" | 83% | Neptune | 2.2" | 100% |
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