IOTA/IOTA-ES occultation update for (335) Roberta / UCAC4 384-152878 event on 2024 Jul 22, 05:24 UT Visible from Summary ------- On 2024 Jul 22 UT, the 95.627 km diameter asteroid (335) Roberta will occult a 11.4 mag star in the constellation Aquarius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 0.73 mag to 11.33 mag (the magnitude of the asteroid) for at most 14.340 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 Jul 22, 05:08 - 2024 Jul 22, 05:40 * geocentric midpoint of event [JD]: 2460513.72534359 * magnitude of target star: 11.37 * magnitude drop [mag]: 0.73 * estimated maximum duration [s]: 14.340 * Moon: 99 % sunlit, 9° distance * Sun: 165° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 97 * 1 sigma uncertainty interval [path widths]: +/- 0.07 * 1 sigma uncertainty interval [seconds]: +/- 3.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.026, +/- 0.007) * 1 sigma uncertainty ellipse (major, minor, PA): (0.027", 0.004", 77°) * approx speed of asteroid's shadow [km/s]: 6.6687 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 384-152878 by 335 Roberta on 2024 Jul 22 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 -171 0 0 -39 32 33 5 40 9.6 0 107 -14 -39 5 10 -39 59 58 .. .. .. -40 4 1 .... -170 0 0 -39 46 30 5 40 9.4 1 106 -15 -39 19 12 -40 13 51 -39 15 10 -40 17 53 0.19 -169 0 0 -39 59 58 5 40 9.1 2 106 -16 -39 32 44 -40 27 15 -39 28 43 -40 31 17 0.18 -168 0 0 -40 12 58 5 40 8.6 3 105 -17 -39 45 47 -40 40 10 -39 41 47 -40 44 11 0.17 -167 0 0 -40 25 28 5 40 7.9 3 104 -18 -39 58 21 -40 52 36 -39 54 21 -40 56 37 0.17 -166 0 0 -40 37 29 5 40 7.0 4 104 -18 -40 10 27 -41 4 34 -40 6 27 -41 8 34 0.17 -165 0 0 -40 49 3 5 40 6.0 5 103 -19 -40 22 4 -41 16 4 -40 18 5 -41 20 4 0.17 -164 0 0 -41 0 8 5 40 4.7 6 102 -20 -40 33 13 -41 27 6 -40 29 14 -41 31 5 0.17 -163 0 0 -41 10 46 5 40 3.3 6 102 -21 -40 43 53 -41 37 40 -40 39 56 -41 41 39 0.17 -162 0 0 -41 20 55 5 40 1.8 7 101 -21 -40 54 6 -41 47 47 -40 50 9 -41 51 45 0.17 -161 0 0 -41 30 38 5 40 0.1 8 100 -22 -41 3 52 -41 57 26 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Uncertainty in time = +/- 3 secs Prediction of 2023 Jul 15.2 Data for the target star ------------------------ * name: UCAC4 384-152878 * constellation : Aquarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 21 00 02.6412 DE: -13 13 50.980 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 21 00 02.6412 DE: -13 13 50.980 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.400,0.300) * V mag [mag]: 11.4 * B mag [mag]: 11.8 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (335) Roberta asteroid class: approx. diameter [km]: 96 approx. diameter ["]: 0.124 distance from Earth [AU]: 1.06610 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#74 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): 0.027", 0.004", 77.151° remarks: * orbital elements for (335)Roberta : Mean anomaly = 12.9296603748 deg Arg. of pericenter = 139.7840051819 deg Long. of node = 148.4150484163 deg Inclination = 5.1023591210 deg Eccentricity = 0.1719741130 Semimajor axis = 2.4755465915 AU Perihelion dist = 2.0498166623 AU Mag: H = 9.09, G = 0.15 Epoch of elements : MJD 60513.22534437 TDT (2024 Jul 22.2253) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#742023Apr24,14.34,2024,7,22,5.408246,0.089500,-0.152784,-3.247465,-1.903108,-0.001107,-0.000653,0.000001,0.000000 -66.2309,-13.1342,100.51,20.17,False UCAC4 384-152878,21.00073366,-13.2308279,11.83,11.37,11.12,0.0,0,,21.02356762,-13.1342275,0.73,0.64,0,0,0 335,Roberta,11.33,95.627,1.0661,0,0,-1.834,-15.70,,4.8,0 0,12.8726,2024,7,22,139.7840,148.4150,5.1024,0.17197,2.47555,2.04982,9.09,5.0,0.15 1.074,0.0270,0.0043,77,0.0091,Known errors,1.52,0,-1,-1 20240722_152878,60140.21 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 05:07 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org