IOTA/IOTA-ES occultation update for (2426) Simonov / UCAC4 540-014900 event on 2024 Apr 05, 08:55 UT Visible from Summary ------- On 2024 Apr 05 UT, the 27.0897162500033 km diameter asteroid (2426) Simonov will occult a 11.3 mag star in the constellation Taurus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 6.63 mag to 17.92 mag (the magnitude of the asteroid) for at most 1.030 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: 98 * date and approx. time of event: 2024 Apr 05, 08:52 - 2024 Apr 05, 08:59 * geocentric midpoint of event [JD]: 2460405.87207891 * magnitude of target star: 11.29 * magnitude drop [mag]: 6.63 * estimated maximum duration [s]: 1.030 * Moon: 16 % sunlit, 113° distance * Sun: 66° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 33 * 1 sigma uncertainty interval [path widths]: +/- 0.36 * 1 sigma uncertainty interval [seconds]: +/- 1.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.011, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.011", 0.003", 99°) * approx speed of asteroid's shadow [km/s]: 26.5553 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 540-014900 by 2426 Simonov on 2024 Apr 5 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 38 0 0 -35 8 26 8 52 27.0 1 67 48 -35 17 59 -34 58 55 -35 24 53 -34 52 3 .... 39 0 0 -34 48 12 8 52 27.0 2 67 48 -34 57 45 -34 38 41 -35 4 39 -34 31 49 0.35 40 0 0 -34 27 54 8 52 27.2 2 66 49 -34 37 27 -34 18 22 -34 44 21 -34 11 31 0.46 41 0 0 -34 7 32 8 52 27.4 3 66 49 -34 17 4 -33 58 0 -34 23 58 -33 51 8 0.51 42 0 0 -33 47 5 8 52 27.7 4 65 50 -33 56 38 -33 37 34 -34 3 32 -33 30 42 0.54 43 0 0 -33 26 36 8 52 28.1 5 65 50 -33 36 8 -33 17 5 -33 43 2 -33 10 13 0.56 44 0 0 -33 6 4 8 52 28.5 6 64 51 -33 15 36 -32 56 33 -33 22 30 -32 49 41 0.57 45 0 0 -32 45 30 8 52 29.0 7 63 51 -32 55 2 -32 35 59 -33 1 56 -32 29 7 0.58 46 0 0 -32 24 54 8 52 29.6 8 63 51 -32 34 26 -32 15 23 -32 41 19 -32 8 32 0.59 47 0 0 -32 4 17 8 52 30.2 9 62 52 -32 13 49 -31 54 46 -32 20 42 -31 47 55 0.60 48 0 0 -31 43 39 8 52 31.0 10 62 52 -31 53 11 -31 34 9 -32 0 4 -31 27 18 0.60 49 0 0 -31 23 2 8 52 31.8 11 61 52 -31 32 33 -31 13 31 -31 39 26 -31 6 41 0.61 50 0 0 -31 2 24 8 52 32.6 11 61 53 -31 11 55 -30 52 54 -31 18 48 -30 46 4 0.61 51 0 0 -30 41 47 8 52 33.6 12 60 53 -30 51 18 -30 32 18 -30 58 10 -30 25 28 0.61 52 0 0 -30 21 12 8 52 34.6 13 60 53 -30 30 42 -30 11 43 -30 37 34 -30 4 53 0.61 53 0 0 -30 0 39 8 52 35.7 14 59 53 -30 10 8 -29 51 10 -30 17 0 -29 44 20 0.62 54 0 0 -29 40 8 8 52 36.9 15 59 54 -29 49 37 -29 30 39 -29 56 29 -29 23 50 0.62 55 0 0 -29 19 40 8 52 38.2 16 58 54 -29 29 9 -29 10 12 -29 36 0 -29 3 22 0.62 56 0 0 -28 59 15 8 52 39.5 17 58 54 -29 8 44 -28 49 48 -29 15 35 -28 42 59 0.62 57 0 0 -28 38 55 8 52 41.0 18 57 54 -28 48 23 -28 29 28 -28 55 13 -28 22 39 0.62 58 0 0 -28 18 39 8 52 42.4 19 56 54 -28 28 6 -28 9 12 -28 34 57 -28 2 24 0.63 59 0 0 -27 58 28 8 52 44.0 20 56 54 -28 7 55 -27 49 2 -28 14 45 -27 42 14 0.63 60 0 0 -27 38 22 8 52 45.7 21 55 54 -27 47 49 -27 28 57 -27 54 39 -27 22 9 0.63 61 0 0 -27 18 23 8 52 47.4 22 55 54 -27 27 49 -27 8 58 -27 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36 -21 29 11 -21 54 16 -21 22 33 0.66 174 0 0 -21 54 55 8 58 54.9 18 299 -38 -22 4 9 -21 45 42 -22 10 50 -21 39 4 0.66 175 0 0 -22 11 42 8 58 56.3 17 298 -38 -22 20 57 -22 2 28 -22 27 37 -21 55 49 0.66 176 0 0 -22 28 43 8 58 57.7 16 298 -39 -22 37 58 -22 19 28 -22 44 40 -22 12 49 0.66 177 0 0 -22 45 57 8 58 59.0 15 297 -40 -22 55 13 -22 36 42 -23 1 55 -22 30 2 0.66 178 0 0 -23 3 25 8 59 0.2 14 297 -41 -23 12 42 -22 54 10 -23 19 25 -22 47 29 0.66 179 0 0 -23 21 6 8 59 1.3 13 296 -42 -23 30 24 -23 11 50 -23 37 7 -23 5 9 0.66 180 0 0 -23 39 0 8 59 2.3 12 296 -43 -23 48 18 -23 29 43 -23 55 2 -23 23 1 0.66 -179 0 0 -23 57 5 8 59 3.3 11 296 -44 -24 6 24 -23 47 48 -24 13 8 -23 41 6 0.66 -178 0 0 -24 15 23 8 59 4.2 10 295 -44 -24 24 42 -24 6 4 -24 31 27 -23 59 22 0.66 -177 0 0 -24 33 51 8 59 5.0 9 295 -45 -24 43 11 -24 24 32 -24 49 56 -24 17 49 0.67 -176 0 0 -24 52 30 8 59 5.7 8 294 -46 -25 1 51 -24 43 10 -25 8 37 -24 36 27 0.67 -175 0 0 -25 11 20 8 59 6.4 7 294 -47 -25 20 41 -25 1 59 -25 27 27 -24 55 16 0.67 -174 0 0 -25 30 19 8 59 6.9 6 293 -47 -25 39 41 -25 20 58 -25 46 27 -25 14 13 0.67 -173 0 0 -25 49 27 8 59 7.4 5 293 -48 -25 58 50 -25 40 5 -26 5 37 -25 33 21 0.68 -172 0 0 -26 8 44 8 59 7.8 4 292 -49 -26 18 8 -25 59 22 -26 24 55 -25 52 37 0.69 -171 0 0 -26 28 10 8 59 8.1 3 292 -50 -26 37 34 -26 18 47 -26 44 21 -26 12 1 0.70 -170 0 0 -26 47 43 8 59 8.4 2 292 -50 -26 57 7 -26 38 19 -27 3 56 -26 31 33 0.71 -169 0 0 -27 7 23 8 59 8.5 2 291 -51 -27 16 49 -26 57 59 -27 23 37 -26 51 13 0.75 -168 0 0 -27 27 11 8 59 8.6 1 291 -52 -27 36 36 -27 17 46 -27 43 25 -27 10 59 0.92 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 14.3 Data for the target star ------------------------ * name: UCAC4 540-014900 * constellation : Taurus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 05 23 47.6856 DE: +17 59 10.832 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 05 23 47.6856 DE: +17 59 10.832 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.3 * B mag [mag]: 12.0 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2426) Simonov asteroid class: approx. diameter [km]: 27 approx. diameter ["]: 0.011 distance from Earth [AU]: 3.45090 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#49 date of fit: 2023 Apr 27 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): 0.011", 0.003", 99.1° remarks: * orbital elements for (2426)Simonov : Mean anomaly = 223.8684352779 deg Arg. of pericenter = 6.2001864392 deg Long. of node = 236.8252856174 deg Inclination = 8.5031344146 deg Eccentricity = 0.1181365870 Semimajor axis = 2.9086986930 AU Perihelion dist = 2.5650749567 AU Mag: H = 11.83, G = 0.15 Epoch of elements : MJD 60405.37207829 TDT (2024 Apr 05.3721) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#492023Apr27,1.03,2024,4,5,8.929894,0.038804,-0.545341,14.949760,1.077711,0.005348,0.000110,-0.000001,0.000000 113.1959,18.0090,46.70,6.32,False UCAC4 540-014900,5.39657937,17.9863423,12.00,11.29,10.91,0.1,0,,5.41993103,18.0090416,6.63,6.57,0,0,0 2426,Simonov,17.92,27.340,3.4509,0,0,2.671,2.75,,1.6,0 0,223.7945,2024,4,5,6.2002,236.8253,8.5031,0.11814,2.90870,2.56507,11.83,5.0,0.15 1.361,0.0113,0.0030,99,0.0039,Known errors,1.14,0,-1,-1 20240405_014900,60139.28 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 14, 06:36 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org