IOTA/IOTA-ES occultation update for (1402) Eri / TYC 5169-01808-1 event on 2024 Oct 13, 23:25 UT Visible from Summary ------- On 2024 Oct 13 UT, the 15.9196655772788 km diameter asteroid (1402) Eri will occult a 9.9 mag star in the constellation Aquila for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 7.46 mag to 17.32 mag (the magnitude of the asteroid) for at most 1.230 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: 68 * date and approx. time of event: 2024 Oct 13, 23:16 - 2024 Oct 13, 23:33 * geocentric midpoint of event [JD]: 2460597.47570275 * magnitude of target star: 9.86 * magnitude drop [mag]: 7.46 * estimated maximum duration [s]: 1.230 * Moon: 82 % sunlit, 33° distance * Sun: 103° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 16 * 1 sigma uncertainty interval [path widths]: +/- 0.88 * 1 sigma uncertainty interval [seconds]: +/- 1.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.017, +/- 0.010) * 1 sigma uncertainty ellipse (major, minor, PA): (0.019", 0.005", 64°) * approx speed of asteroid's shadow [km/s]: 13.0894 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5169-01808-1 by 1402 Eri on 2024 Oct 13 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 -160 0 0 -10 27 20 23 17 3.5 0 94 77 -10 31 48 -10 22 53 -10 39 38 -10 15 4 .... -159 0 0 -10 31 50 23 17 3.6 1 94 76 -10 36 18 -10 27 22 -10 44 7 -10 19 33 0.15 -158 0 0 -10 36 20 23 17 3.9 2 94 75 -10 40 48 -10 31 52 -10 48 38 -10 24 3 0.18 -157 0 0 -10 40 52 23 17 4.3 3 94 74 -10 45 20 -10 36 24 -10 53 10 -10 28 35 0.19 -156 0 0 -10 45 26 23 17 4.8 4 94 73 -10 49 54 -10 40 58 -10 57 43 -10 33 9 0.19 -155 0 0 -10 50 0 23 17 5.5 5 93 72 -10 54 28 -10 45 33 -11 2 18 -10 37 43 0.20 -154 0 0 -10 54 36 23 17 6.4 6 93 71 -10 59 4 -10 50 9 -11 6 54 -10 42 19 0.20 -153 0 0 -10 59 14 23 17 7.4 7 93 70 -11 3 42 -10 54 46 -11 11 31 -10 46 56 0.20 -152 0 0 -11 3 52 23 17 8.5 8 93 69 -11 8 20 -10 59 24 -11 16 9 -10 51 34 0.20 -151 0 0 -11 8 31 23 17 9.8 9 93 68 -11 12 59 -11 4 3 -11 20 48 -10 56 14 0.20 -150 0 0 -11 13 11 23 17 11.2 10 92 67 -11 17 39 -11 8 43 -11 25 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22 -15 29 5 -15 4 34 0.21 - 16 0 0 -15 13 51 23 31 37.8 33 275 -60 -15 18 18 -15 9 24 -15 26 7 -15 1 36 0.21 - 15 0 0 -15 10 49 23 31 42.4 32 274 -60 -15 15 16 -15 6 22 -15 23 5 -14 58 33 0.21 - 14 0 0 -15 7 43 23 31 46.8 31 274 -61 -15 12 10 -15 3 16 -15 19 59 -14 55 27 0.21 - 13 0 0 -15 4 33 23 31 51.2 30 274 -62 -15 9 1 -15 0 6 -15 16 50 -14 52 18 0.21 - 12 0 0 -15 1 20 23 31 55.4 29 273 -62 -15 5 48 -14 56 53 -15 13 37 -14 49 5 0.21 - 11 0 0 -14 58 4 23 31 59.4 28 273 -63 -15 2 31 -14 53 36 -15 10 20 -14 45 48 0.21 - 10 0 0 -14 54 43 23 32 3.4 27 273 -63 -14 59 11 -14 50 16 -15 7 0 -14 42 28 0.21 - 9 0 0 -14 51 20 23 32 7.2 26 273 -64 -14 55 47 -14 46 52 -15 3 36 -14 39 4 0.21 - 8 0 0 -14 47 53 23 32 10.9 25 272 -64 -14 52 20 -14 43 25 -15 0 9 -14 35 37 0.21 - 7 0 0 -14 44 22 23 32 14.4 24 272 -65 -14 48 50 -14 39 55 -14 56 39 -14 32 7 0.21 - 6 0 0 -14 40 49 23 32 17.8 23 272 -65 -14 45 17 -14 36 21 -14 53 6 -14 28 33 0.21 - 5 0 0 -14 37 12 23 32 21.1 22 271 -66 -14 41 40 -14 32 45 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0.22 8 0 0 -13 46 4 23 32 51.0 9 268 -68 -13 50 31 -13 41 36 -13 58 21 -13 33 47 0.22 9 0 0 -13 41 51 23 32 52.4 8 268 -67 -13 46 19 -13 37 23 -13 54 8 -13 29 34 0.23 10 0 0 -13 37 36 23 32 53.5 7 267 -67 -13 42 4 -13 33 8 -13 49 53 -13 25 19 0.23 11 0 0 -13 33 19 23 32 54.5 6 267 -67 -13 37 47 -13 28 51 -13 45 36 -13 21 2 0.23 12 0 0 -13 29 1 23 32 55.4 5 267 -67 -13 33 28 -13 24 33 -13 41 18 -13 16 44 0.23 13 0 0 -13 24 40 23 32 56.2 4 267 -66 -13 29 8 -13 20 12 -13 36 58 -13 12 23 0.24 14 0 0 -13 20 18 23 32 56.7 3 266 -66 -13 24 46 -13 15 50 -13 32 36 -13 8 1 0.25 15 0 0 -13 15 55 23 32 57.2 2 266 -66 -13 20 23 -13 11 27 -13 28 12 -13 3 38 0.26 16 0 0 -13 11 30 23 32 57.5 2 266 -65 -13 15 58 -13 7 2 -13 23 47 -12 59 13 0.30 17 0 0 -13 7 3 23 32 57.6 1 266 -65 -13 11 31 -13 2 35 -13 19 21 -12 54 46 0.46 Uncertainty in time = +/- 2 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: TYC 5169-01808-1 * constellation : Aquila * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 20 10 00.7478 DE: -04 18 08.554 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 20 10 00.7476 DE: -04 18 08.554 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 9.9 * B mag [mag]: 10.6 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1402) Eri asteroid class: approx. diameter [km]: 16 approx. diameter ["]: 0.011 distance from Earth [AU]: 1.96250 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#52 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): 0.019", 0.005", 63.54° remarks: * orbital elements for (1402)Eri : Mean anomaly = 37.9483918291 deg Arg. of pericenter = 11.5793139395 deg Long. of node = 266.9425619907 deg Inclination = 14.2942063920 deg Eccentricity = 0.1544729746 Semimajor axis = 2.6840791780 AU Perihelion dist = 2.2694614832 AU Mag: H = 12.84, G = 0.15 Epoch of elements : MJD 60596.97570271 TDT (2024 Oct 13.9757) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#522023Apr24,1.23,2024,10,13,23.416866,-0.004530,-0.202966,7.386062,-0.169372,0.005387,0.000903,0.000000,0.000000 -71.4322,-4.2286,-174.75,-8.24,False TYC 5169-01808-1,20.16687440,-4.3023761,10.60,9.86,9.46,0.1,0,,20.18864010,-4.2285774,7.46,7.41,0,0,0 1402,Eri,17.32,16.062,1.9625,0,0,2.213,-0.76,,1.0,0 0,37.7297,2024,10,13,11.5793,266.9426,14.2942,0.15447,2.68408,2.26946,12.84,5.0,0.15 1.876,0.0187,0.0053,64,0.0099,Known errors,0.93,0,-1,-1 20241013_1808-1,60140.63 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:09 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org