IOTA/IOTA-ES occultation update for (2478) Tokai / UCAC4 392-057885 event on 2024 Jul 27, 09:00 UT Visible from Summary ------- On 2024 Jul 27 UT, the 9.772 km diameter asteroid (2478) Tokai will occult a 11.1 mag star in the constellation Virgo for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 5.86 mag to 16.95 mag (the magnitude of the asteroid) for at most 0.530 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: 99 * date and approx. time of event: 2024 Jul 27, 08:55 - 2024 Jul 27, 09:05 * geocentric midpoint of event [JD]: 2460518.87534071 * magnitude of target star: 11.09 * magnitude drop [mag]: 5.86 * estimated maximum duration [s]: 0.530 * Moon: 59 % sunlit, 170° distance * Sun: 89° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 11 * 1 sigma uncertainty interval [path widths]: +/- 0.13 * 1 sigma uncertainty interval [seconds]: +/- 1.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.013, +/- 0.004) * 1 sigma uncertainty ellipse (major, minor, PA): (0.013", 0.001", 106°) * approx speed of asteroid's shadow [km/s]: 18.3730 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 392-057885 by 2478 Tokai on 2024 Jul 27 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 41 0 0 - 7 13 23 8 55 11.9 0 102 63 - 7 16 21 - 7 10 25 - 7 17 8 - 7 9 38 .... 42 0 0 - 7 26 25 8 55 12.0 1 102 63 - 7 29 24 - 7 23 27 - 7 30 11 - 7 22 40 0.34 43 0 0 - 7 39 48 8 55 12.2 2 102 63 - 7 42 47 - 7 36 50 - 7 43 34 - 7 36 2 0.39 44 0 0 - 7 53 32 8 55 12.5 3 102 63 - 7 56 31 - 7 50 33 - 7 57 19 - 7 49 46 0.41 45 0 0 - 8 7 37 8 55 13.0 4 101 63 - 8 10 36 - 8 4 38 - 8 11 23 - 8 3 50 0.42 46 0 0 - 8 22 2 8 55 13.5 5 101 63 - 8 25 1 - 8 19 3 - 8 25 49 - 8 18 15 0.42 47 0 0 - 8 36 47 8 55 14.2 6 101 62 - 8 39 47 - 8 33 48 - 8 40 34 - 8 33 0 0.43 48 0 0 - 8 51 52 8 55 15.1 7 101 62 - 8 54 52 - 8 48 53 - 8 55 40 - 8 48 5 0.43 49 0 0 - 9 7 17 8 55 16.0 8 101 62 - 9 10 18 - 9 4 17 - 9 11 5 - 9 3 30 0.43 50 0 0 - 9 23 2 8 55 17.1 9 101 62 - 9 26 2 - 9 20 1 - 9 26 50 - 9 19 14 0.43 51 0 0 - 9 39 5 8 55 18.2 11 100 61 - 9 42 6 - 9 36 5 - 9 42 54 - 9 35 17 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37.1 13 265 -64 -42 26 43 -42 20 50 -42 27 30 -42 20 4 0.46 -146 0 0 -42 15 29 9 5 38.2 12 265 -65 -42 18 25 -42 12 32 -42 19 12 -42 11 45 0.46 -145 0 0 -42 6 53 9 5 39.2 11 264 -65 -42 9 50 -42 3 57 -42 10 37 -42 3 10 0.47 -144 0 0 -41 58 1 9 5 40.1 11 263 -66 -42 0 58 -41 55 4 -42 1 45 -41 54 17 0.47 -143 0 0 -41 48 51 9 5 41.0 10 263 -66 -41 51 48 -41 45 53 -41 52 35 -41 45 6 0.47 -142 0 0 -41 39 23 9 5 41.9 9 262 -67 -41 42 21 -41 36 25 -41 43 8 -41 35 39 0.47 -141 0 0 -41 29 38 9 5 42.6 8 261 -67 -41 32 36 -41 26 40 -41 33 23 -41 25 53 0.48 -140 0 0 -41 19 36 9 5 43.3 7 261 -67 -41 22 34 -41 16 38 -41 23 21 -41 15 51 0.48 -139 0 0 -41 9 16 9 5 44.0 7 260 -68 -41 12 15 -41 6 18 -41 13 2 -41 5 31 0.48 -138 0 0 -40 58 39 9 5 44.6 6 259 -68 -41 1 38 -40 55 41 -41 2 25 -40 54 54 0.49 -137 0 0 -40 47 45 9 5 45.1 5 259 -68 -40 50 44 -40 44 47 -40 51 31 -40 43 59 0.50 -136 0 0 -40 36 34 9 5 45.5 4 258 -68 -40 39 33 -40 33 35 -40 40 20 -40 32 48 0.51 -135 0 0 -40 25 6 9 5 45.9 4 257 -69 -40 28 5 -40 22 6 -40 28 52 -40 21 19 0.52 -134 0 0 -40 13 20 9 5 46.1 3 257 -69 -40 16 20 -40 10 21 -40 17 7 -40 9 33 0.54 -133 0 0 -40 1 18 9 5 46.4 2 256 -69 -40 4 17 -39 58 18 -40 5 5 -39 57 30 0.58 -132 0 0 -39 48 58 9 5 46.5 1 255 -69 -39 51 58 -39 45 58 -39 52 45 -39 45 10 0.68 -131 0 0 -39 36 21 9 5 46.6 0 255 -69 -39 39 22 -39 33 21 -39 40 9 -39 32 34 1.15 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.2 Data for the target star ------------------------ * name: UCAC4 392-057885 * constellation : Virgo * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 14 04 48.7296 DE: -11 47 43.628 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 14 04 48.7296 DE: -11 47 43.628 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 11.1 * B mag [mag]: 11.6 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2478) Tokai asteroid class: asteroid system: multiple bodies approx. diameter [km]: 10 approx. diameter ["]: 0.006 distance from Earth [AU]: 2.12100 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#59 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", 106.323° remarks: * orbital elements for (2478)Tokai : Mean anomaly = 130.8632510602 deg Arg. of pericenter = 233.8929682391 deg Long. of node = 228.6995589386 deg Inclination = 4.1425751821 deg Eccentricity = 0.0676517235 Semimajor axis = 2.2258836900 AU Perihelion dist = 2.0752988221 AU Mag: H = 12.30, G = 0.15 Epoch of elements : MJD 60518.37534079 TDT (2024 Jul 27.3753) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#592023Apr24,0.53,2024,7,27,9.008177,-0.114904,-0.386700,9.941836,-2.949827,0.005035,-0.001814,0.000000,0.000000 130.8723,-11.9132,46.52,19.06,False UCAC4 392-057885,14.08020270,-11.7954523,11.64,11.09,10.79,0.0,0,,14.10211338,-11.9132160,5.86,5.71,0,0,0 2478,Tokai,16.95,9.772,2.1210,0,1,2.809,-12.23,,0.6,0 ,5.8,21,1.079000,,,,,, 0,130.7519,2024,7,27,233.8930,228.6996,4.1426,0.06765,2.22588,2.07530,12.30,5.0,0.15 1.132,0.0133,0.0008,106,0.0008,Known errors,0.95,0,-1,-1 20240727_057885,60140.22 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 05:18 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org