IOTA/IOTA-ES occultation update for (907) Rhoda / UCAC4 258-190436 event on 2024 Nov 20, 19:21 UT Visible from Summary ------- On 2024 Nov 20 UT, the 73.309 km diameter asteroid (907) Rhoda will occult a 11.6 mag star in the constellation Sagittarius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 4.44 mag to 15.98 mag (the magnitude of the asteroid) for at most 2.100 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 20, 19:18 - 2024 Nov 20, 19:23 * geocentric midpoint of event [JD]: 2460635.30631292 * magnitude of target star: 11.56 * magnitude drop [mag]: 4.44 * estimated maximum duration [s]: 2.100 * Moon: 71 % sunlit, 160° distance * Sun: 51° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 89 * 1 sigma uncertainty interval [path widths]: +/- 0.08 * 1 sigma uncertainty interval [seconds]: +/- 0.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.007, +/- 0.001) * 1 sigma uncertainty ellipse (major, minor, PA): (0.007", 0.001", 89°) * approx speed of asteroid's shadow [km/s]: 34.9822 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 258-190436 by 907 Rhoda on 2024 Nov 20 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 175 0 0 .. .. .... .. .. .. .. .. .. -37 51 3 .. .. .. -37 57 30 .. .. .. .... 176 0 0 -38 12 4 19 18 35.4 1 141 27 -38 51 18 -37 33 20 -38 57 47 -37 27 1 .... 177 0 0 -39 11 50 19 18 35.6 2 140 28 -39 51 17 -38 32 53 -39 57 49 -38 26 32 0.62 178 0 0 -40 11 17 19 18 35.8 4 140 29 -40 50 56 -39 32 8 -40 57 30 -39 25 45 0.65 179 0 0 -41 10 20 19 18 36.2 5 139 29 -41 50 10 -40 31 1 -41 56 46 -40 24 36 0.66 -180 0 0 -42 8 56 19 18 36.7 6 138 30 -42 48 57 -41 29 27 -42 55 34 -41 23 1 0.67 -179 0 0 -43 7 1 19 18 37.2 7 137 31 -43 47 11 -42 27 23 -43 53 50 -42 20 56 0.67 -178 0 0 -44 4 31 19 18 37.9 8 137 32 -44 44 48 -43 24 46 -44 51 29 -43 18 17 0.68 -177 0 0 -45 1 23 19 18 38.6 10 136 32 -45 41 46 -44 21 31 -45 48 27 -44 15 1 0.68 -176 0 0 -45 57 31 19 18 39.4 11 135 33 -46 38 0 -45 17 35 -46 44 42 -45 11 4 0.68 -175 0 0 -46 52 55 19 18 40.3 12 135 33 -47 33 27 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43 256 -4 -49 6 44 -47 45 48 -49 13 29 -47 39 15 0.70 8 0 0 -47 31 37 19 22 33.9 42 255 -5 -48 12 20 -46 51 26 -48 19 5 -46 44 53 0.70 9 0 0 -46 36 21 19 22 36.8 41 254 -6 -47 17 2 -45 56 12 -47 23 46 -45 49 39 0.70 10 0 0 -45 40 15 19 22 39.7 40 252 -7 -46 20 52 -45 0 10 -46 27 35 -44 53 38 0.70 11 0 0 -44 43 23 19 22 42.6 39 251 -8 -45 23 54 -44 3 23 -45 30 37 -43 56 51 0.71 12 0 0 -43 45 47 19 22 45.5 38 250 -10 -44 26 13 -43 5 54 -44 32 54 -42 59 23 0.71 13 0 0 -42 47 33 19 22 48.4 37 249 -11 -43 27 51 -42 7 47 -43 34 31 -42 1 18 0.71 14 0 0 -41 48 44 19 22 51.2 36 247 -12 -42 28 52 -41 9 6 -42 35 31 -41 2 39 0.71 15 0 0 -40 49 23 19 22 54.0 35 246 -13 -41 29 21 -40 9 55 -41 35 58 -40 3 29 0.71 16 0 0 -39 49 35 19 22 56.8 34 245 -14 -40 29 22 -39 10 19 -40 35 57 -39 3 54 0.71 17 0 0 -38 49 24 19 22 59.4 32 244 -16 -39 28 59 -38 10 20 -39 35 32 -38 3 57 0.71 18 0 0 -37 48 55 19 23 2.1 31 243 -17 -38 28 16 -37 10 3 -38 34 47 -37 3 43 0.71 19 0 0 -36 48 11 19 23 4.6 30 242 -18 -37 27 18 -36 9 33 -37 33 46 -36 3 15 0.71 20 0 0 -35 47 17 19 23 7.1 29 241 -20 -36 26 9 -35 8 54 -36 32 34 -35 2 39 0.72 21 0 0 -34 46 18 19 23 9.5 28 241 -21 -35 24 53 -34 8 10 -35 31 16 -34 1 57 0.72 22 0 0 -33 45 16 19 23 11.8 27 240 -22 -34 23 35 -33 7 25 -34 29 55 -33 1 15 0.72 23 0 0 -32 44 18 19 23 14.1 25 239 -24 -33 22 19 -32 6 43 -33 28 36 -32 0 35 0.72 24 0 0 -31 43 26 19 23 16.2 24 238 -25 -32 21 9 -31 6 9 -32 27 23 -31 0 4 0.72 25 0 0 -30 42 45 19 23 18.3 23 238 -26 -31 20 9 -30 5 45 -31 26 21 -29 59 43 0.72 26 0 0 -29 42 18 19 23 20.2 21 237 -27 -30 19 24 -29 5 37 -30 25 32 -28 59 38 0.73 27 0 0 -28 42 10 19 23 22.0 20 236 -29 -29 18 56 -28 5 47 -29 25 1 -27 59 51 0.73 28 0 0 -27 42 23 19 23 23.8 19 236 -30 -28 18 50 -27 6 19 -28 24 52 -27 0 26 0.73 29 0 0 -26 43 1 19 23 25.4 18 235 -31 -27 19 9 -26 7 17 -27 25 7 -26 1 26 0.73 30 0 0 -25 44 8 19 23 26.9 16 235 -33 -26 19 56 -25 8 43 -26 25 51 -25 2 56 0.74 31 0 0 -24 45 47 19 23 28.3 15 234 -34 -25 21 15 -24 10 41 -25 27 7 -24 4 57 0.74 32 0 0 -23 48 0 19 23 29.6 14 234 -35 -24 23 8 -23 13 13 -24 28 56 -23 7 32 0.75 33 0 0 -22 50 49 19 23 30.7 12 233 -37 -23 25 38 -22 16 22 -23 31 23 -22 10 44 0.75 34 0 0 -21 54 19 19 23 31.8 11 233 -38 -22 28 47 -21 20 11 -22 34 29 -21 14 36 0.76 35 0 0 -20 58 30 19 23 32.7 10 232 -39 -21 32 39 -20 24 41 -21 38 17 -20 19 10 0.77 36 0 0 -20 3 26 19 23 33.5 8 232 -41 -20 37 15 -19 29 56 -20 42 50 -19 24 27 0.78 37 0 0 -19 9 7 19 23 34.2 7 232 -42 -19 42 37 -18 35 56 -19 48 9 -18 30 31 0.79 38 0 0 -18 15 37 19 23 34.8 6 231 -43 -18 48 47 -17 42 45 -18 54 16 -17 37 22 0.81 39 0 0 -17 22 56 19 23 35.2 5 231 -45 -17 55 47 -16 50 22 -18 1 13 -16 45 3 0.84 40 0 0 -16 31 7 19 23 35.6 3 231 -46 -17 3 39 -15 58 51 -17 9 1 -15 53 35 0.90 41 0 0 -15 40 10 19 23 35.8 2 230 -47 -16 12 23 -15 8 12 -16 17 43 -15 2 59 1.03 42 0 0 -14 50 6 19 23 35.9 1 230 -48 -15 22 2 -14 18 27 -15 27 18 -14 13 16 1.58 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: UCAC4 258-190436 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 19 26 54.6688 DE: -38 31 42.974 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 19 26 54.6687 DE: -38 31 42.974 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.6 * B mag [mag]: 12.1 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (907) Rhoda asteroid class: approx. diameter [km]: 73 approx. diameter ["]: 0.027 distance from Earth [AU]: 3.78100 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#62 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): 0.007", 0.001", 89.288° remarks: * orbital elements for (907)Rhoda : Mean anomaly = 167.4872536734 deg Arg. of pericenter = 88.4587028518 deg Long. of node = 42.9189815913 deg Inclination = 19.5320459875 deg Eccentricity = 0.1641013633 Semimajor axis = 2.7991463309 AU Perihelion dist = 2.3398026019 AU Mag: H = 9.74, G = 0.15 Epoch of elements : MJD 60634.80631271 TDT (2024 Nov 20.8063) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#622023Apr24,2.10,2024,11,20,19.351510,0.155719,-0.542945,18.973610,5.464838,0.004651,-0.000385,-0.000001,0.000000 -58.4249,-38.4810,-113.82,-19.93,False UCAC4 258-190436,19.44851915,-38.5286039,12.14,11.56,11.25,0.0,0,,19.47629081,-38.4809779,4.44,4.31,0,0,0 907,Rhoda,15.98,73.309,3.7810,0,0,3.759,12.71,,3.2,0 0,167.3176,2024,11,20,88.4587,42.9190,19.5320,0.16410,2.79915,2.33980,9.75,5.0,0.15 1.082,0.0070,0.0012,89,0.0022,Known errors,0.99,0,-1,-1 20241120_190436,60140.71 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 16:58 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org