IOTA/IOTA-ES occultation update for (907) Rhoda / 2UCAC 45493233 event on 2012 Nov 04, 02:50 UT Visible from Europe Summary ------- On 2012 Nov 04 UT, the 75 km diameter asteroid (907) Rhoda will occult a 11.6 mag star in the constellation Auriga for observers along a path across Europe. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.5 mag to 14.0 mag (the magnitude of the asteroid) for at most 6.9 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Alice Monet, TMO astrometry for the asteroid kindly provided by Bill Owen, historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: UCAC. The event at a glimpse ---------------------- * Rank: 85 * date and approx. time of event: 2012 Nov 04, 02:42 - 2012 Nov 04, 03:00 UT * geocentric midpoint of event [JD]: 2456235.61895417 * magnitude of target star: 11.6 * magnitude drop [mag]: 2.5 * estimated maximum duration [s]: 6.9 * Moon: 77 % sunlit, 19° distance * Sun: 121° distance * rough path description: Europe The occultation path -------------------- * approximate projected width [km]: 79 * 1 sigma uncertainty interval [path widths]: +/- 0.61 * 1 sigma uncertainty interval [seconds]: +/- 3.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .036 +/- .027) * 1 sigma uncertainty ellipse (major, minor, PA): ( .036", .027", 86° ) * approx speed of asteroid's shadow [km/s]: 10.9436 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of 2UCAC 45493233 by 907 Rhoda on 2012 Nov 4 Centre Star Star Sun Path Limit1 Path Limit2 Error Limit1 Error Limit2 E. Longitude Latitude U.T. Alt Az Alt o ' " o ' " h m s o o o o ' " o ' " o ' " o ' " o ' " o ' " o ' " o ' " Longitude Latitude Longitude Latitude Longitude Latitude Longitude Latitude - 26 22 0 -29 59 16 2 42 17 10 33 -41 - 27 6 34 -30 23 35 - 25 39 51 -29 37 31 - 28 5 9 -30 57 40 - 24 51 3 -29 13 47 - 23 19 38 -24 44 41 2 42 31 16 32 -45 - 23 52 27 -24 56 46 - 22 47 31 -24 33 22 - 24 33 33 -25 12 42 - 22 9 13 -24 20 32 - 21 26 33 -20 52 43 2 42 45 20 31 -47 - 21 55 30 -21 0 53 - 20 58 1 -20 45 1 - 22 31 23 -21 11 30 - 20 23 42 -20 36 13 - 20 2 50 -17 37 50 2 42 58 23 31 -49 - 20 29 42 -17 43 56 - 19 36 14 -17 32 5 - 21 2 52 -17 51 51 - 19 4 9 -17 25 30 - 18 56 3 -14 45 22 2 43 12 26 31 -50 - 19 21 36 -14 50 10 - 18 30 42 -14 40 51 - 19 53 5 -14 56 24 - 18 0 3 -14 35 42 - 18 0 29 -12 8 20 2 43 26 29 31 -52 - 18 25 8 -12 12 13 - 17 36 0 -12 4 40 - 18 55 28 -12 17 17 - 17 6 21 -12 0 31 - 17 12 59 - 9 42 43 2 43 40 32 31 -53 - 17 36 59 - 9 45 56 - 16 49 7 - 9 39 42 - 18 6 28 - 9 50 8 - 16 20 13 - 9 36 18 - 16 31 34 - 7 25 59 2 43 54 34 31 -54 - 16 55 5 - 7 28 41 - 16 8 11 - 7 23 29 - 17 23 56 - 7 32 13 - 15 39 50 - 7 20 40 - 15 54 57 - 5 16 25 2 44 8 36 31 -54 - 16 18 5 - 5 18 42 - 15 31 56 - 5 14 19 - 16 46 28 - 5 21 42 - 15 3 59 - 5 11 58 - 15 22 13 - 3 12 46 2 44 22 38 32 -55 - 15 45 4 - 3 14 42 - 14 59 28 - 3 10 59 - 16 13 5 - 3 17 17 - 14 31 50 - 3 9 2 - 14 52 41 - 1 14 5 2 44 35 40 32 -56 - 15 15 19 - 1 15 44 - 14 30 8 - 1 12 35 - 15 43 4 - 1 17 57 - 14 2 46 - 1 10 57 - 14 25 52 0 40 21 2 44 49 42 33 -56 - 14 48 21 0 38 56 - 14 3 28 0 41 37 - 15 15 53 0 37 2 - 13 36 16 0 42 58 - 14 1 22 2 31 6 2 45 3 44 33 -57 - 14 23 44 2 29 54 - 13 39 5 2 32 9 - 14 51 8 2 28 15 - 13 12 0 2 33 17 - 13 38 53 4 18 38 2 45 17 46 34 -57 - 14 1 11 4 17 37 - 13 16 40 4 19 31 - 14 28 29 4 16 12 - 12 49 40 4 20 25 - 13 18 10 6 3 20 2 45 31 47 35 -57 - 13 40 26 6 2 28 - 12 55 59 6 4 4 - 14 7 41 6 1 16 - 12 29 1 6 4 47 - 12 59 2 7 45 31 2 45 45 49 35 -57 - 13 21 17 7 44 48 - 12 36 51 7 46 7 - 13 48 31 7 43 46 - 12 9 53 7 46 40 - 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9 35 18 59 20 20 - 11 26 52 60 47 45 2 54 18 63 131 -38 - 12 10 55 60 48 5 - 10 42 57 60 47 13 - 13 4 49 60 48 13 - 9 49 33 60 46 18 - 11 48 31 62 14 16 2 54 32 62 133 -37 - 12 34 43 62 14 31 - 11 2 28 62 13 49 - 13 31 14 62 14 33 - 10 6 28 62 12 59 - 12 13 56 63 41 32 2 54 46 61 134 -36 - 13 2 33 63 41 41 - 11 25 28 63 41 10 - 14 2 1 63 41 34 - 10 26 32 63 40 26 - 12 43 52 65 9 36 2 55 0 60 136 -35 - 13 35 13 65 9 38 - 11 52 40 65 9 21 - 14 38 3 65 9 20 - 10 50 23 65 8 43 - 13 19 18 66 38 32 2 55 13 58 137 -34 - 14 13 47 66 38 24 - 12 24 57 66 38 25 - 15 20 26 66 37 53 - 11 18 51 66 37 56 - 14 1 29 68 8 22 2 55 27 57 137 -33 - 14 59 36 68 8 2 - 13 3 30 68 8 25 - 16 10 40 68 7 16 - 11 53 0 68 8 7 - 14 52 8 69 39 9 2 55 41 56 138 -32 - 15 54 28 69 38 35 - 13 49 56 69 39 26 - 17 10 40 69 37 29 - 12 34 17 69 39 21 - 15 53 36 71 10 56 2 55 55 54 138 -31 - 17 0 54 71 10 4 - 14 46 25 71 11 29 - 18 23 7 71 8 33 - 13 24 39 71 11 42 - 17 9 7 72 43 42 2 56 9 53 138 -30 - 18 22 20 72 42 26 - 15 55 59 72 44 36 - 19 51 43 72 40 24 - 14 26 56 72 45 12 - 18 43 23 74 17 25 2 56 23 52 137 -29 - 20 3 45 74 15 39 - 17 23 2 74 18 46 - 21 41 43 74 12 57 - 15 45 7 74 19 52 - 20 43 20 75 51 56 2 56 37 50 136 -28 - 22 12 25 75 49 31 - 19 14 7 75 53 53 - 24 0 49 75 45 56 - 17 25 14 75 55 39 - 23 19 37 77 26 58 2 56 50 49 135 -27 - 24 59 29 77 23 40 - 21 39 21 77 29 44 - 27 0 38 77 18 55 - 19 36 40 77 32 24 - 26 49 15 79 1 56 2 57 4 47 132 -26 - 28 42 31 78 57 25 - 24 55 3 79 5 50 - 30 59 13 78 51 5 - 22 34 44 79 9 45 - 31 40 29 80 35 38 2 57 18 45 128 -24 - 33 50 8 80 29 25 - 29 28 49 80 41 9 - 36 25 16 80 20 52 - 26 45 49 80 46 53 - 38 41 41 82 5 42 2 57 32 44 122 -23 - 41 9 49 81 57 1 - 36 9 16 82 13 34 - 44 4 27 81 45 22 - 32 57 56 82 22 1 - 49 13 57 83 27 11 2 57 46 42 112 -22 - 51 56 48 83 14 58 - 46 22 26 83 38 32 - 55 4 0 82 59 0 - 42 41 26 83 51 7 - 65 8 10 84 29 59 2 58 0 40 97 -21 - 67 42 13 84 13 10 - 62 19 55 84 46 7 - 70 32 59 83 51 48 - 58 33 12 85 4 43 - 86 55 0 84 57 11 2 58 14 38 76 -19 - 88 27 13 84 35 57 - 85 11 19 85 18 8 - 90 7 0 84 9 41 - 82 45 29 85 43 14 -110 1 23 84 33 45 2 58 28 36 53 -18 -110 2 16 84 10 39 -110 2 17 84 56 42 -110 5 19 83 42 19 -110 6 24 85 24 33 -128 16 36 83 22 25 2 58 41 34 36 -17 -127 20 56 82 59 58 -129 20 7 83 44 34 -126 22 4 82 32 11 -130 50 7 84 11 7 -140 36 3 81 36 48 2 58 55 31 24 -15 -139 23 3 81 15 37 -141 56 5 81 57 29 -138 2 36 80 49 10 -143 44 20 82 22 1 -148 43 38 79 26 38 2 59 9 29 16 -13 -147 31 19 79 6 21 -150 1 5 79 46 20 -146 9 36 78 40 50 -151 42 59 80 9 32 -154 14 44 76 55 26 2 59 23 26 11 -12 -153 8 54 76 35 22 -155 24 14 77 14 50 -151 53 19 76 10 2 -156 54 7 77 37 36 -158 8 28 74 1 53 2 59 37 23 7 -10 -157 10 22 73 41 14 -159 9 14 74 21 49 -156 3 1 73 15 3 -160 27 2 74 45 9 -160 59 18 70 39 44 2 59 51 20 5 -8 -160 8 48 70 17 17 -161 51 51 71 1 19 -159 9 56 69 48 42 -162 58 44 71 26 30 -163 7 43 66 33 12 3 0 5 16 3 -5 -162 24 28 66 6 32 -163 52 40 66 58 39 -161 33 59 65 32 14 -164 49 45 67 28 8 -164 46 45 60 52 33 3 0 18 10 2 -2 -164 11 3 60 12 22 -165 24 7 61 29 38 -163 29 54 59 18 9 -166 11 50 62 11 19 Uncertainty in time = +/- 4 secs Prediction of 2012 Oct 26.0 Data for the target star ------------------------ * name: 2UCAC 45493233 * constellation : Auriga * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 06 45 55.6716 DE: +39 16 30.341 * position source: mpos:UCAC4 pm:UCAC4 * standard error: RA,DE ["]: ( .019, .023 ) * V mag [mag]: 11.6 * B mag [mag]: 0.0 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (907) Rhoda approx. diameter [km]: 75 approx. diameter ["]: .057 distance from Earth [AU]: 1.80700 * orbital information: orbit source: Preston date of fit: 2012 Oct 25 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 904 number of rejected observations: 52 time covered by the observations: 1918 Nov 13 - 2012 Oct 19 1 sigma uncertainty ellipse (major, minor, PA): 0.031, 0.014, 84° remarks: * orbital elements for (907) Rhoda : Mean anomaly = 323.24935583 deg Arg. of pericenter = 87.36090401 deg Long. of node = 43.14674325 deg Inclination = 19.56520907 deg Eccentricity = 0.16147050 Semimajor axis = 2.80171140 AU Perihelion dist = 2.34931765 AU Mag: H = 9.64, G = 0.15 Epoch of elements : MJD 56235.11900000 TDT (2012 Nov 04.119) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Nov 4 907 Rhoda 2h 51.3m UT 11.6 6 45 55.672 39 16 30.342UCAC 45493233 0.0 14.0 75 6.9 1.807 0.807 28.56 14.8987 39.267 133.07 -15.46 2.8549 -0.30965 0.10059 1.92864 5.86803 -0.00488 -0.00045 2000 322.17350020121030.00000 87.360904 43.146743 19.5652090.16147050 2.8017114 2.3493177 9.8 5.00.15 RATE 2.1016920 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.036 0.027 86 1.61 0.035 0 0-4 1 056226.0020121104_493233 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Oct 25, 21:48 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org