IOTA/IOTA-ES occultation update for (287) Nephthys / UCAC4 494-054534 event on 2024 Nov 01, 05:49 UT Visible from Summary ------- On 2024 Nov 01 UT, the 65.076 km diameter asteroid (287) Nephthys will occult a 11.6 mag star in the constellation Leo for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 1.97 mag to 13.39 mag (the magnitude of the asteroid) for at most 2.210 seconds. This update is based on, astrometry for the asteroid kindly provided by the IAU Minor Planet Center. This work has made use of data from the European Space Agency (ESA) mission Gaia (http://www.cosmos.esa.int/gaia), processed by the Gaia Data Processing and Analysis Consortium (DPAC, http://www.cosmos.esa.int/web/gaia/dpac/consortium). Funding for the DPAC has been provided by national institutions, in particular the institutions participating in the Gaia Multilateral Agreement. The event at a glimpse ---------------------- * Rank: 100 * date and approx. time of event: 2024 Nov 01, 05:45 - 2024 Nov 01, 05:53 * geocentric midpoint of event [JD]: 2460615.74263255 * magnitude of target star: 11.61 * magnitude drop [mag]: 1.97 * estimated maximum duration [s]: 2.210 * Moon: 0 % sunlit, 64° distance * Sun: 66° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 65 * 1 sigma uncertainty interval [path widths]: +/- 0.05 * 1 sigma uncertainty interval [seconds]: +/- 0.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.013, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.013", 0.001", 100°) * approx speed of asteroid's shadow [km/s]: 29.4007 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 494-054534 by 287 Nephthys on 2024 Nov 1 Centre Star Star Sun Path Limits Error Limits Alt E. Longitude Latitude U.T. Alt Az Alt Limit 1 Limit 2 Limit 3 Limit 4 Crn o ' " o ' " h m s o o o o ' " o ' " o ' " o ' " Latitude Latitude Latitude Latitude - 66 0 0 21 21 30 5 45 47.5 0 81 -66 21 3 33 21 39 27 21 1 49 21 41 11 .... - 65 0 0 21 30 23 5 45 47.5 1 81 -65 21 12 27 21 48 19 21 10 43 21 50 3 -0.11 - 64 0 0 21 38 59 5 45 47.6 2 82 -64 21 21 4 21 56 54 21 19 20 21 58 38 -0.10 - 63 0 0 21 47 18 5 45 47.8 3 82 -63 21 29 24 22 5 12 21 27 40 22 6 56 -0.10 - 62 0 0 21 55 20 5 45 48.0 4 82 -62 21 37 26 22 13 13 21 35 42 22 14 57 -0.10 - 61 0 0 22 3 4 5 45 48.3 5 83 -61 21 45 12 22 20 57 21 43 28 22 22 41 -0.10 - 60 0 0 22 10 32 5 45 48.7 6 83 -60 21 52 40 22 28 24 21 50 56 22 30 8 -0.10 - 59 0 0 22 17 42 5 45 49.0 7 84 -59 21 59 50 22 35 33 21 58 7 22 37 17 -0.10 - 58 0 0 22 24 34 5 45 49.5 8 84 -58 22 6 44 22 42 25 22 5 0 22 44 9 -0.10 - 57 0 0 22 31 9 5 45 50.0 9 84 -57 22 13 19 22 48 59 22 11 36 22 50 43 -0.10 - 56 0 0 22 37 27 5 45 50.6 10 85 -56 22 19 37 22 55 16 22 17 54 22 57 0 -0.10 - 55 0 0 22 43 26 5 45 51.2 11 85 -55 22 25 38 23 1 15 22 23 55 23 2 59 -0.10 - 54 0 0 22 49 9 5 45 51.9 11 85 -54 22 31 21 23 6 57 22 29 37 23 8 40 -0.10 - 53 0 0 22 54 33 5 45 52.6 12 86 -54 22 36 46 23 12 21 22 35 2 23 14 4 -0.10 - 52 0 0 22 59 40 5 45 53.4 13 86 -53 22 41 53 23 17 27 22 40 10 23 19 10 -0.10 - 51 0 0 23 4 28 5 45 54.2 14 87 -52 22 46 42 23 22 15 22 44 59 23 23 58 -0.10 - 50 0 0 23 8 59 5 45 55.1 15 87 -51 22 51 13 23 26 46 22 49 30 23 28 29 -0.10 - 49 0 0 23 13 12 5 45 56.1 16 87 -50 22 55 27 23 30 58 22 53 44 23 32 41 -0.10 - 48 0 0 23 17 7 5 45 57.1 17 88 -49 22 59 22 23 34 53 22 57 39 23 36 36 -0.10 - 47 0 0 23 20 44 5 45 58.2 18 88 -48 23 2 59 23 38 29 23 1 16 23 40 12 -0.10 - 46 0 0 23 24 3 5 45 59.3 19 89 -47 23 6 19 23 41 48 23 4 36 23 43 31 -0.09 - 45 0 0 23 27 4 5 46 0.4 20 89 -46 23 9 20 23 44 48 23 7 37 23 46 31 -0.09 - 44 0 0 23 29 46 5 46 1.7 21 89 -45 23 12 3 23 47 31 23 10 20 23 49 14 -0.09 - 43 0 0 23 32 11 5 46 2.9 22 90 -44 23 14 28 23 49 55 23 12 45 23 51 38 -0.09 - 42 0 0 23 34 17 5 46 4.2 23 90 -43 23 16 34 23 52 1 23 14 51 23 53 44 -0.09 - 41 0 0 23 36 6 5 46 5.6 24 91 -42 23 18 23 23 53 49 23 16 40 23 55 32 -0.09 - 40 0 0 23 37 36 5 46 7.0 24 91 -42 23 19 53 23 55 19 23 18 10 23 57 2 -0.09 - 39 0 0 23 38 47 5 46 8.5 25 92 -41 23 21 5 23 56 31 23 19 22 23 58 13 -0.09 - 38 0 0 23 39 41 5 46 10.1 26 92 -40 23 21 58 23 57 24 23 20 16 23 59 7 -0.09 - 37 0 0 23 40 16 5 46 11.6 27 92 -39 23 22 34 23 57 59 23 20 51 23 59 42 -0.09 - 36 0 0 23 40 33 5 46 13.3 28 93 -38 23 22 51 23 58 16 23 21 8 23 59 59 -0.09 - 35 0 0 23 40 32 5 46 14.9 29 93 -37 23 22 49 23 58 15 23 21 7 23 59 57 -0.09 - 34 0 0 23 40 12 5 46 16.7 30 94 -36 23 22 30 23 57 55 23 20 47 23 59 38 -0.09 - 33 0 0 23 39 34 5 46 18.4 31 94 -35 23 21 51 23 57 17 23 20 9 23 59 0 -0.09 - 32 0 0 23 38 38 5 46 20.3 32 95 -34 23 20 55 23 56 21 23 19 12 23 58 4 -0.09 - 31 0 0 23 37 23 5 46 22.2 33 95 -33 23 19 40 23 55 6 23 17 58 23 56 49 -0.09 - 30 0 0 23 35 50 5 46 24.1 34 95 -32 23 18 7 23 53 33 23 16 24 23 55 16 -0.09 - 29 0 0 23 33 59 5 46 26.1 35 96 -31 23 16 16 23 51 42 23 14 33 23 53 25 -0.09 - 28 0 0 23 31 49 5 46 28.1 35 96 -30 23 14 6 23 49 33 23 12 23 23 51 16 -0.09 - 27 0 0 23 29 21 5 46 30.1 36 97 -30 23 11 37 23 47 5 23 9 55 23 48 48 -0.09 - 26 0 0 23 26 35 5 46 32.3 37 97 -29 23 8 51 23 44 19 23 7 8 23 46 2 -0.09 - 25 0 0 23 23 30 5 46 34.4 38 98 -28 23 5 46 23 41 15 23 4 3 23 42 58 -0.09 - 24 0 0 23 20 7 5 46 36.6 39 98 -27 23 2 22 23 37 52 23 0 39 23 39 35 -0.09 - 23 0 0 23 16 26 5 46 38.9 40 99 -26 22 58 41 23 34 11 22 56 58 23 35 54 -0.09 - 22 0 0 23 12 26 5 46 41.2 41 99 -25 22 54 41 23 30 12 22 52 58 23 31 55 -0.09 - 21 0 0 23 8 8 5 46 43.5 42 99 -24 22 50 22 23 25 54 22 48 39 23 27 38 -0.09 - 20 0 0 23 3 32 5 46 45.9 43 100 -23 22 45 46 23 21 19 22 44 3 23 23 2 -0.09 - 19 0 0 22 58 38 5 46 48.4 44 100 -22 22 40 51 23 16 25 22 39 8 23 18 8 -0.09 - 18 0 0 22 53 25 5 46 50.9 45 101 -21 22 35 38 23 11 13 22 33 55 23 12 56 -0.09 - 17 0 0 22 47 54 5 46 53.4 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41 35 -10 5 41 -10 43 19 -10 3 57 -0.25 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: UCAC4 494-054534 * constellation : Leo * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 10 16 50.0386 DE: +08 41 18.950 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 10 16 50.0387 DE: +08 41 18.949 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 11.6 * B mag [mag]: 12.2 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (287) Nephthys asteroid class: approx. diameter [km]: 65 approx. diameter ["]: 0.034 distance from Earth [AU]: 2.61530 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#136 date of fit: 2023 Apr 24 source of used astrometry: MPC, JPL number of used observations: 0 number of rejected observations: 0 time covered by the observations: 1800 Jan 01 - 1800 Jan 01 1 sigma uncertainty ellipse (major, minor, PA): 0.013", 0.001", 100.016° remarks: * orbital elements for (287)Nephthys : Mean anomaly = 227.2248703667 deg Arg. of pericenter = 122.9440417461 deg Long. of node = 142.2327736085 deg Inclination = 10.0337969700 deg Eccentricity = 0.0235175926 Semimajor axis = 2.3526090835 AU Perihelion dist = 2.2972813814 AU Mag: H = 8.34, G = 0.22 Epoch of elements : MJD 60615.24263242 TDT (2024 Nov 01.2426) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1362023Apr24,2.21,2024,11,1,5.823181,0.026579,0.091055,15.952342,-4.571953,-0.004894,0.001805,-0.000001,0.000000 26.1721,8.5663,88.55,-14.59,False UCAC4 494-054534,10.28056625,8.6885973,12.21,11.61,11.29,0.0,0,K,10.30221587,8.5663236,1.97,1.87,0,0,0 287,Nephthys,13.39,65.076,2.6153,0,0,3.617,-15.38,,3.6,0 0,227.1586,2024,11,1,122.9440,142.2328,10.0338,0.02352,2.35261,2.29728,8.34,5.0,0.15 1.048,0.0130,0.0010,100,0.0017,Known errors,0.99,0,-1,-1 20241101_054534,60140.67 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 16:08 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org