IOTA/IOTA-ES occultation update for (907) Rhoda / UCAC4 260-189842 event on 2024 Nov 25, 23:40 UT Visible from Summary ------- On 2024 Nov 25 UT, the 73.0798730984708 km diameter asteroid (907) Rhoda will occult a 10.1 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 5.90 mag to 15.99 mag (the magnitude of the asteroid) for at most 2.020 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 25, 23:37 - 2024 Nov 25, 23:43 * geocentric midpoint of event [JD]: 2460640.48655133 * magnitude of target star: 10.09 * magnitude drop [mag]: 5.90 * estimated maximum duration [s]: 2.020 * Moon: 23 % sunlit, 102° distance * Sun: 48° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 74 * 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", 88°) * approx speed of asteroid's shadow [km/s]: 36.3548 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 260-189842 by 907 Rhoda on 2024 Nov 25 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 128 0 0 -20 42 54 23 37 45.2 1 131 39 -21 9 42 -20 16 9 -21 13 48 -20 12 5 .... 129 0 0 -21 31 43 23 37 45.2 2 131 40 -21 58 28 -21 5 1 -22 2 33 -21 0 58 0.23 130 0 0 -22 20 2 23 37 45.4 3 130 42 -22 46 43 -21 53 24 -22 50 47 -21 49 21 0.21 131 0 0 -23 7 48 23 37 45.7 4 130 43 -23 34 25 -22 41 14 -23 38 29 -22 37 11 0.20 132 0 0 -23 55 0 23 37 46.0 5 129 44 -24 21 33 -23 28 30 -24 25 35 -23 24 28 0.20 133 0 0 -24 41 36 23 37 46.4 7 129 45 -25 8 4 -24 15 11 -25 12 6 -24 11 10 0.19 134 0 0 -25 27 35 23 37 46.8 8 129 46 -25 53 59 -25 1 15 -25 58 0 -24 57 15 0.19 135 0 0 -26 12 56 23 37 47.4 9 128 46 -26 39 14 -25 46 41 -26 43 15 -25 42 42 0.19 136 0 0 -26 57 38 23 37 48.0 10 128 47 -27 23 50 -26 31 28 -27 27 50 -26 27 30 0.19 137 0 0 -27 41 39 23 37 48.7 11 127 48 -28 7 45 -27 15 35 -28 11 44 -27 11 37 0.19 138 0 0 -28 24 58 23 37 49.4 12 127 49 -28 50 59 -27 59 1 -28 54 57 -27 55 4 0.19 139 0 0 -29 7 35 23 37 50.2 14 126 50 -29 33 30 -28 41 44 -29 37 26 -28 37 48 0.19 140 0 0 -29 49 29 23 37 51.1 15 126 51 -30 15 17 -29 23 44 -30 19 13 -29 19 49 0.19 141 0 0 -30 30 39 23 37 52.0 16 125 52 -30 56 20 -30 5 1 -31 0 15 -30 1 7 0.19 142 0 0 -31 11 5 23 37 52.9 17 125 53 -31 36 39 -30 45 33 -31 40 33 -30 41 40 0.19 143 0 0 -31 50 45 23 37 54.0 18 124 53 -32 16 12 -31 25 20 -32 20 5 -31 21 28 0.19 144 0 0 -32 29 40 23 37 55.0 19 124 54 -32 55 0 -32 4 22 -32 58 52 -32 0 32 0.19 145 0 0 -33 7 50 23 37 56.1 20 123 55 -33 33 3 -32 42 39 -33 36 53 -32 38 49 0.18 146 0 0 -33 45 13 23 37 57.3 21 122 55 -34 10 19 -33 20 10 -34 14 8 -33 16 21 0.18 147 0 0 -34 21 50 23 37 58.5 22 122 56 -34 46 48 -33 56 54 -34 50 37 -33 53 7 0.18 148 0 0 -34 57 41 23 37 59.7 23 121 57 -35 22 32 -34 32 53 -35 26 19 -34 29 6 0.18 149 0 0 -35 32 46 23 38 1.0 24 121 57 -35 57 29 -35 8 5 -36 1 15 -35 4 20 0.18 150 0 0 -36 7 5 23 38 2.3 25 120 58 -36 31 40 -35 42 31 -36 35 25 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Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: UCAC4 260-189842 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 19 34 46.9955 DE: -38 05 17.583 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 19 34 46.9951 DE: -38 05 17.582 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 10.1 * B mag [mag]: 10.5 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (907) Rhoda asteroid class: approx. diameter [km]: 73 approx. diameter ["]: 0.026 distance from Earth [AU]: 3.83480 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", 87.966° remarks: * orbital elements for (907)Rhoda : Mean anomaly = 168.5774482869 deg Arg. of pericenter = 88.4587365003 deg Long. of node = 42.9188441499 deg Inclination = 19.5320376690 deg Eccentricity = 0.1641087069 Semimajor axis = 2.7991288727 AU Perihelion dist = 2.3397674529 AU Mag: H = 9.74, G = 0.15 Epoch of elements : MJD 60639.98655125 TDT (2024 Nov 25.9866) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#622023Apr24,2.02,2024,11,25,23.677232,0.048433,-0.164864,19.713375,5.695596,0.004446,-0.000433,-0.000001,0.000000 -126.4517,-38.0362,-178.34,-20.99,False UCAC4 260-189842,19.57972102,-38.0882175,10.48,10.09,9.88,0.1,0,,19.60728661,-38.0361913,5.90,5.67,0,0,1 907,Rhoda,15.99,73.358,3.8348,0,0,3.826,13.07,,3.2,0 0,168.3698,2024,11,25,88.4587,42.9188,19.5320,0.16411,2.79913,2.33977,9.75,5.0,0.15 1.076,0.0067,0.0012,88,0.0020,Known errors,0.98,0,-1,-1 20241125_189842,60140.71 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 17:09 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org