IOTA/IOTA-ES occultation update for (758) Mancunia / UCAC4 350-105863 event on 2021 Feb 28, 00:55 UT Visible from S Africa Summary ------- On 2021 Feb 28 UT, the 90.9 km diameter asteroid (758) Mancunia will occult a 12.4 mag star in the constellation Ophiuchus for observers along a path across S Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.69 mag to 14.95 mag (the magnitude of the asteroid) for at most 4.1 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Hugh Harris, astrometry for the asteroid kindly provided by Bill Owen, 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: 2021 Feb 28, 00:50 - 2021 Feb 28, 00:59 * geocentric midpoint of event [JD]: 2459273.53845000 * magnitude of target star: 12.36 * magnitude drop [mag]: 2.69 * estimated maximum duration [s]: 4.1 * Moon: 99 % sunlit, 95° distance * Sun: 75° distance * rough path description: S Africa The occultation path -------------------- * approximate projected width [km]: 102 * 1 sigma uncertainty interval [path widths]: +/- 0.24 * 1 sigma uncertainty interval [seconds]: +/- 1.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.012, +/- 0.008) * 1 sigma uncertainty ellipse (major, minor, PA): (0.012", 0.008", 98°) * approx speed of asteroid's shadow [km/s]: 22.0361 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 350-105863 by 758 Mancunia on 2021 Feb 28 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 - 5 0 0 -24 27 0 0 51 6.0 1 112 -57 -24 57 4 -23 57 4 -25 11 46 -23 42 32 .... - 4 0 0 -24 49 23 0 51 6.2 2 111 -57 -25 19 29 -24 19 27 -25 34 12 -24 4 54 0.47 - 3 0 0 -25 11 49 0 51 6.4 3 111 -56 -25 41 56 -24 41 52 -25 56 39 -24 27 19 0.48 - 2 0 0 -25 34 17 0 51 6.7 4 110 -56 -26 4 24 -25 4 18 -26 19 8 -24 49 44 0.49 - 1 0 0 -25 56 45 0 51 7.2 5 110 -55 -26 26 53 -25 26 46 -26 41 38 -25 12 11 0.50 0 0 0 -26 19 14 0 51 7.7 6 109 -55 -26 49 23 -25 49 14 -27 4 8 -25 34 39 0.50 1 0 0 -26 41 42 0 51 8.3 7 109 -54 -27 11 52 -26 11 42 -27 26 38 -25 57 7 0.51 2 0 0 -27 4 10 0 51 9.0 8 109 -53 -27 34 21 -26 34 9 -27 49 7 -26 19 34 0.51 3 0 0 -27 26 37 0 51 9.8 9 108 -53 -27 56 48 -26 56 35 -28 11 34 -26 42 0 0.51 4 0 0 -27 49 2 0 51 10.7 10 108 -52 -28 19 13 -27 18 59 -28 33 59 -27 4 24 0.51 5 0 0 -28 11 24 0 51 11.6 11 107 -51 -28 41 36 -27 41 22 -28 56 22 -27 26 46 0.51 6 0 0 -28 33 44 0 51 12.7 12 107 -51 -29 3 56 -28 3 41 -29 18 42 -27 49 5 0.51 7 0 0 -28 56 0 0 51 13.8 13 106 -50 -29 26 12 -28 25 57 -29 40 58 -28 11 21 0.51 8 0 0 -29 18 12 0 51 15.1 13 106 -49 -29 48 24 -28 48 9 -30 3 10 -28 33 33 0.51 9 0 0 -29 40 19 0 51 16.4 14 105 -48 -30 10 31 -29 10 16 -30 25 18 -28 55 41 0.51 10 0 0 -30 2 22 0 51 17.8 15 105 -48 -30 32 33 -29 32 19 -30 47 20 -29 17 43 0.51 11 0 0 -30 24 18 0 51 19.2 16 104 -47 -30 54 30 -29 54 16 -31 9 16 -29 39 40 0.51 12 0 0 -30 46 9 0 51 20.8 17 103 -46 -31 16 20 -30 16 7 -31 31 6 -30 1 32 0.51 13 0 0 -31 7 53 0 51 22.4 18 103 -45 -31 38 3 -30 37 52 -31 52 49 -30 23 17 0.51 14 0 0 -31 29 30 0 51 24.1 19 102 -45 -31 59 40 -30 59 29 -32 14 25 -30 44 54 0.51 15 0 0 -31 50 59 0 51 25.9 20 102 -44 -32 21 8 -31 20 59 -32 35 53 -31 6 25 0.51 16 0 0 -32 12 21 0 51 27.7 21 101 -43 -32 42 29 -31 42 21 -32 57 13 -31 27 47 0.51 17 0 0 -32 33 33 0 51 29.6 22 101 -42 -33 3 41 -32 3 35 -33 18 25 -31 49 1 0.52 18 0 0 -32 54 37 0 51 31.6 23 100 -41 -33 24 43 -32 24 40 -33 39 27 -32 10 7 0.52 19 0 0 -33 15 32 0 51 33.6 24 99 -41 -33 45 36 -32 45 35 -34 0 20 -32 31 3 0.52 20 0 0 -33 36 16 0 51 35.7 24 99 -40 -34 6 20 -33 6 21 -34 21 2 -32 51 49 0.52 21 0 0 -33 56 50 0 51 37.9 25 98 -39 -34 26 53 -33 26 57 -34 41 34 -33 12 25 0.52 22 0 0 -34 17 14 0 51 40.2 26 97 -38 -34 47 15 -33 47 21 -35 1 56 -33 32 51 0.52 23 0 0 -34 37 26 0 51 42.5 27 97 -37 -35 7 26 -34 7 35 -35 22 6 -33 53 5 0.52 24 0 0 -34 57 27 0 51 44.8 28 96 -37 -35 27 25 -34 27 38 -35 42 5 -34 13 9 0.52 25 0 0 -35 17 16 0 51 47.2 29 95 -36 -35 47 13 -34 47 29 -36 1 51 -34 33 0 0.52 26 0 0 -35 36 53 0 51 49.7 30 95 -35 -36 6 48 -35 7 8 -36 21 26 -34 52 40 0.52 27 0 0 -35 56 18 0 51 52.2 30 94 -34 -36 26 11 -35 26 34 -36 40 48 -35 12 7 0.52 28 0 0 -36 15 30 0 51 54.8 31 93 -33 -36 45 20 -35 45 47 -36 59 56 -35 31 22 0.52 29 0 0 -36 34 28 0 51 57.4 32 92 -33 -37 4 17 -36 4 48 -37 18 52 -35 50 23 0.52 30 0 0 -36 53 13 0 52 0.0 33 91 -32 -37 23 0 -36 23 35 -37 37 34 -36 9 11 0.52 31 0 0 -37 11 44 0 52 2.7 34 91 -31 -37 41 29 -36 42 8 -37 56 2 -36 27 45 0.52 32 0 0 -37 30 2 0 52 5.5 35 90 -30 -37 59 44 -37 0 28 -38 14 16 -36 46 6 0.52 33 0 0 -37 48 5 0 52 8.3 35 89 -29 -38 17 45 -37 18 33 -38 32 15 -37 4 12 0.52 34 0 0 -38 5 53 0 52 11.1 36 88 -29 -38 35 31 -37 36 23 -38 50 0 -37 22 4 0.52 35 0 0 -38 23 26 0 52 14.0 37 87 -28 -38 53 2 -37 53 59 -39 7 30 -37 39 41 0.52 36 0 0 -38 40 45 0 52 16.9 38 86 -27 -39 10 18 -38 11 20 -39 24 45 -37 57 3 0.52 37 0 0 -38 57 48 0 52 19.9 39 86 -26 -39 27 19 -38 28 26 -39 41 45 -38 14 10 0.52 38 0 0 -39 14 36 0 52 22.8 39 85 -25 -39 44 4 -38 45 16 -39 58 29 -38 31 1 0.52 39 0 0 -39 31 9 0 52 25.9 40 84 -25 -40 0 34 -39 1 51 -40 14 58 -38 47 37 0.52 40 0 0 -39 47 25 0 52 28.9 41 83 -24 -40 16 48 -39 18 10 -40 31 11 -39 3 57 0.52 41 0 0 -40 3 26 0 52 32.0 41 82 -23 -40 32 46 -39 34 13 -40 47 7 -39 20 2 0.51 42 0 0 -40 19 10 0 52 35.1 42 81 -22 -40 48 28 -39 50 0 -41 2 48 -39 35 50 0.51 43 0 0 -40 34 38 0 52 38.2 43 80 -21 -41 3 53 -40 5 31 -41 18 12 -39 51 22 0.51 44 0 0 -40 49 50 0 52 41.4 44 79 -21 -41 19 2 -40 20 45 -41 33 20 -40 6 38 0.51 45 0 0 -41 4 45 0 52 44.6 44 78 -20 -41 33 55 -40 35 43 -41 48 11 -40 21 37 0.51 46 0 0 -41 19 24 0 52 47.8 45 77 -19 -41 48 31 -40 50 24 -42 2 45 -40 36 19 0.51 47 0 0 -41 33 45 0 52 51.0 46 76 -18 -42 2 50 -41 4 49 -42 17 3 -40 50 45 0.51 48 0 0 -41 47 50 0 52 54.2 46 74 -17 -42 16 52 -41 18 56 -42 31 4 -41 4 54 0.51 49 0 0 -42 1 38 0 52 57.5 47 73 -17 -42 30 37 -41 32 47 -42 44 48 -41 18 46 0.51 50 0 0 -42 15 9 0 53 0.8 48 72 -16 -42 44 6 -41 46 21 -42 58 15 -41 32 20 0.51 51 0 0 -42 28 23 0 53 4.1 48 71 -15 -42 57 17 -41 59 37 -43 11 25 -41 45 38 0.51 52 0 0 -42 41 20 0 53 7.4 49 70 -14 -43 10 11 -42 12 36 -43 24 17 -41 58 39 0.51 53 0 0 -42 53 59 0 53 10.8 50 69 -14 -43 22 48 -42 25 19 -43 36 53 -42 11 22 0.51 54 0 0 -43 6 22 0 53 14.1 50 67 -13 -43 35 7 -42 37 43 -43 49 11 -42 23 48 0.51 55 0 0 -43 18 26 0 53 17.5 51 66 -12 -43 47 9 -42 49 51 -44 1 12 -42 35 57 0.51 56 0 0 -43 30 14 0 53 20.8 51 65 -11 -43 58 54 -43 1 41 -44 12 56 -42 47 49 0.51 57 0 0 -43 41 44 0 53 24.2 52 63 -11 -44 10 22 -43 13 14 -44 24 22 -42 59 23 0.51 58 0 0 -43 52 57 0 53 27.6 53 62 -10 -44 21 32 -43 24 29 -44 35 31 -43 10 39 0.51 59 0 0 -44 3 52 0 53 31.1 53 61 -9 -44 32 25 -43 35 27 -44 46 23 -43 21 38 0.51 60 0 0 -44 14 30 0 53 34.5 54 59 -8 -44 43 0 -43 46 7 -44 56 57 -43 32 20 0.51 61 0 0 -44 24 51 0 53 37.9 54 58 -8 -44 53 18 -43 56 30 -45 7 14 -43 42 44 0.51 62 0 0 -44 34 54 0 53 41.3 55 56 -7 -45 3 19 -44 6 36 -45 17 13 -43 52 50 0.51 63 0 0 -44 44 39 0 53 44.8 55 55 -6 -45 13 2 -44 16 23 -45 26 55 -44 2 39 0.51 64 0 0 -44 54 7 0 53 48.2 56 53 -5 -45 22 28 -44 25 54 -45 36 20 -44 12 11 0.51 65 0 0 -45 3 18 0 53 51.7 56 52 -5 -45 31 36 -44 35 7 -45 45 27 -44 21 25 0.51 66 0 0 -45 12 11 0 53 55.2 57 50 -4 -45 40 27 -44 44 2 -45 54 16 -44 30 21 0.51 67 0 0 -45 20 47 0 53 58.6 57 49 -3 -45 49 0 -44 52 40 -46 2 49 -44 39 0 0.51 68 0 0 -45 29 5 0 54 2.1 57 47 -2 -45 57 17 -45 1 0 -46 11 4 -44 47 22 0.51 69 0 0 -45 37 6 0 54 5.6 58 45 -2 -46 5 15 -45 9 3 -46 19 2 -44 55 25 0.51 70 0 0 -45 44 49 0 54 9.1 58 44 -1 -46 12 57 -45 16 49 -46 26 42 -45 3 12 0.52 71 0 0 -45 52 15 0 54 12.6 59 42 0 -46 20 21 -45 24 16 -46 34 5 -45 10 41 0.52 72 0 0 -45 59 24 0 54 16.0 59 40 0 -46 27 27 -45 31 27 -46 41 11 -45 17 52 0.52 73 0 0 -46 6 15 0 54 19.5 59 38 1 -46 34 17 -45 38 20 -46 47 59 -45 24 46 0.52 74 0 0 -46 12 49 0 54 23.0 60 37 2 -46 40 49 -45 44 56 -46 54 31 -45 31 23 0.52 75 0 0 -46 19 6 0 54 26.5 60 35 3 -46 47 4 -45 51 14 -47 0 45 -45 37 42 0.52 76 0 0 -46 25 5 0 54 30.0 60 33 3 -46 53 2 -45 57 15 -47 6 41 -45 43 44 0.52 77 0 0 -46 30 47 0 54 33.5 61 31 4 -46 58 42 -46 2 59 -47 12 21 -45 49 28 0.52 78 0 0 -46 36 12 0 54 37.0 61 29 5 -47 4 5 -46 8 25 -47 17 44 -45 54 55 0.52 79 0 0 -46 41 19 0 54 40.5 61 27 5 -47 9 11 -46 13 34 -47 22 49 -46 0 5 0.52 80 0 0 -46 46 10 0 54 44.0 61 25 6 -47 14 0 -46 18 26 -47 27 37 -46 4 57 0.52 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4 19 -46 42 10 0.52 94 0 0 -47 23 58 0 55 32.8 63 356 16 -47 51 38 -46 56 25 -48 5 10 -46 43 2 0.52 95 0 0 -47 24 33 0 55 36.3 63 354 16 -47 52 12 -46 57 0 -48 5 44 -46 43 36 0.52 96 0 0 -47 24 50 0 55 39.8 62 352 17 -47 52 30 -46 57 17 -48 6 1 -46 43 54 0.52 97 0 0 -47 24 50 0 55 43.2 62 350 18 -47 52 30 -46 57 17 -48 6 2 -46 43 54 0.52 98 0 0 -47 24 34 0 55 46.7 62 348 19 -47 52 13 -46 57 1 -48 5 45 -46 43 37 0.52 99 0 0 -47 24 0 0 55 50.2 62 346 19 -47 51 40 -46 56 27 -48 5 12 -46 43 3 0.52 100 0 0 -47 23 9 0 55 53.6 62 344 20 -47 50 50 -46 55 36 -48 4 22 -46 42 12 0.52 101 0 0 -47 22 2 0 55 57.1 62 342 21 -47 49 42 -46 54 28 -48 3 14 -46 41 4 0.52 102 0 0 -47 20 37 0 56 0.5 62 340 21 -47 48 18 -46 53 3 -48 1 50 -46 39 39 0.52 103 0 0 -47 18 56 0 56 4.0 61 338 22 -47 46 37 -46 51 21 -48 0 10 -46 37 57 0.52 104 0 0 -47 16 57 0 56 7.4 61 336 23 -47 44 39 -46 49 22 -47 58 12 -46 35 57 0.52 105 0 0 -47 14 42 0 56 10.8 61 334 23 -47 42 24 -46 47 6 -47 55 57 -46 33 41 0.52 106 0 0 -47 12 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7 0 59 34.8 11 253 64 -31 41 17 -30 41 6 -31 56 2 -30 26 31 0.55 -179 0 0 -30 49 28 0 59 35.8 10 253 64 -31 19 38 -30 19 26 -31 34 23 -30 4 51 0.56 -178 0 0 -30 27 41 0 59 36.7 9 252 64 -30 57 52 -29 57 40 -31 12 38 -29 43 4 0.56 -177 0 0 -30 5 49 0 59 37.5 8 252 64 -30 36 0 -29 35 47 -30 50 46 -29 21 12 0.57 -176 0 0 -29 43 51 0 59 38.3 7 251 64 -30 14 2 -29 13 49 -30 28 49 -28 59 13 0.57 -175 0 0 -29 21 48 0 59 38.9 7 251 63 -29 51 59 -28 51 46 -30 6 46 -28 37 10 0.58 -174 0 0 -28 59 41 0 59 39.5 6 250 63 -29 29 52 -28 29 38 -29 44 38 -28 15 2 0.59 -173 0 0 -28 37 29 0 59 40.0 5 250 63 -29 7 40 -28 7 27 -29 22 26 -27 52 51 0.61 -172 0 0 -28 15 14 0 59 40.4 4 249 62 -28 45 25 -27 45 11 -29 0 11 -27 30 36 0.63 -171 0 0 -27 52 55 0 59 40.7 3 249 62 -28 23 6 -27 22 54 -28 37 52 -27 8 18 0.67 -170 0 0 -27 30 35 0 59 40.9 2 248 62 -28 0 45 -27 0 33 -28 15 31 -26 45 58 0.75 -169 0 0 -27 8 12 0 59 41.0 1 248 61 -27 38 22 -26 38 11 -27 53 7 -26 23 36 1.04 Uncertainty in time = +/- 1 secs Prediction of 2020 Dec 31.0 Data for the target star ------------------------ * name: UCAC4 350-105863 * constellation : Ophiuchus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 35 40.3005 DE: -20 02 27.451 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 35 40.3006 DE: -20 02 27.451 * position source: Gaia EDR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 12.4 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (758) Mancunia asteroid class: approx. diameter [km]: 91 approx. diameter ["]: 0.033 distance from Earth [AU]: 3.78790 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: Preston date of fit: 2020 Dec 31 source of used astrometry: MPC, FASTT, TMO number of used observations: 3268 number of rejected observations: 21 time covered by the observations: 1960 Oct 18 - 2020 Sep 12 1 sigma uncertainty ellipse (major, minor, PA): 0.012", 0.008", 98° remarks: * orbital elements for (758)Mancunia : Mean anomaly = 191.07134885 deg Arg. of pericenter = 314.49382457 deg Long. of node = 106.18900620 deg Inclination = 5.61055215 deg Eccentricity = 0.15045879 Semimajor axis = 3.18759614 AU Perihelion dist = 2.70799428 AU Mag: H = 8.40, G = 0.15 Epoch of elements : MJD 59273.03800000 TDT (2021 Feb 28.0380) ------ occelmnt file for Occult BEGIN ----------------------------------- Preston2020Dec31,4.1,2021,2,28,0.9228,-0.01629,-0.45471,12.43369,-0.31976,-0.00577,0.00032,0.00000,0.00000 92.3128,-20.0540,169.30,-7.95,False UCAC4 350-105863,17.59452791,-20.0409587,0.00,12.36,0.00,0.0,0,,17.61503352,-20.0539911 758,Mancunia,14.95,90.9,3.7879,0,0,2.049,-0.74,,4.8 0,190.8916,2021,2,27,314.4938,106.1890,5.6106,0.15046,3.18760,2.70799,8.40,5.0,0.15 1.244,0.0120,0.0080,98,0.0081,Known errors 20210228_105863,59214.00 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2020 Dec 31, 02:02 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org