IOTA/IOTA-ES occultation update for (426) Hippo / TYC 6695-00220-1 event on 2023 Feb 25, 23:05 UT Visible from India, Africa Summary ------- On 2023 Feb 25 UT, the 127.6 km diameter asteroid (426) Hippo will occult a 9.3 mag star in the constellation Hydra for observers along a path across India, Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.59 mag to 12.87 mag (the magnitude of the asteroid) for at most 12.290 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: 99 * date and approx. time of event: 2023 Feb 25, 22:55 - 2023 Feb 25, 23:15 * geocentric midpoint of event [JD]: 2460001.46216896 * magnitude of target star: 9.32 * magnitude drop [mag]: 3.59 * estimated maximum duration [s]: 12.290 * Moon: 36 % sunlit, 144° distance * Sun: 132° distance * rough path description: India, Africa The occultation path -------------------- * approximate projected width [km]: 138 * 1 sigma uncertainty interval [path widths]: +/- 0.31 * 1 sigma uncertainty interval [seconds]: +/- 0.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.026, +/- 0.016) * 1 sigma uncertainty ellipse (major, minor, PA): (0.030", 0.002", 121°) * approx speed of asteroid's shadow [km/s]: 10.3832 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6695-00220-1 by 426 Hippo on 2023 Feb 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 - 58 0 0 .. .. .... .. .. .. .. .. .. .. .. .. -22 31 18 .. .. .. -22 58 18 .... - 57 0 0 -22 21 5 23 14 58.5 1 121 -13 -21 37 2 -23 4 50 -21 9 49 -23 31 35 .... - 56 0 0 -22 53 46 23 14 58.2 2 121 -14 -22 10 7 -23 37 8 -21 43 9 -24 3 39 -0.24 - 55 0 0 -23 25 13 23 14 57.7 3 120 -15 -22 41 57 -24 8 13 -22 15 13 -24 34 30 -0.31 - 54 0 0 -23 55 29 23 14 57.0 4 120 -16 -23 12 35 -24 38 7 -22 46 5 -25 4 11 -0.35 - 53 0 0 -24 24 34 23 14 56.0 5 120 -16 -23 42 1 -25 6 52 -23 15 44 -25 32 43 -0.37 - 52 0 0 -24 52 31 23 14 54.9 6 119 -17 -24 10 18 -25 34 29 -23 44 14 -26 0 8 -0.38 - 51 0 0 -25 19 21 23 14 53.6 7 119 -18 -24 37 27 -26 0 59 -24 11 35 -26 26 27 -0.39 - 50 0 0 -25 45 5 23 14 52.1 8 118 -18 -25 3 30 -26 26 25 -24 37 49 -26 51 42 -0.39 - 49 0 0 -26 9 45 23 14 50.4 9 118 -19 -25 28 28 -26 50 48 -25 2 58 -27 15 54 -0.40 - 48 0 0 -26 33 22 23 14 48.5 10 118 -20 -25 52 21 -27 14 8 -25 27 2 -27 39 4 -0.40 - 47 0 0 -26 55 57 23 14 46.5 11 117 -20 -26 15 13 -27 36 27 -25 50 4 -28 1 14 -0.40 - 46 0 0 -27 17 32 23 14 44.3 12 117 -21 -26 37 3 -27 57 47 -26 12 4 -28 22 25 -0.41 - 45 0 0 -27 38 7 23 14 42.0 13 116 -22 -26 57 53 -28 18 8 -26 33 3 -28 42 37 -0.41 - 44 0 0 -27 57 45 23 14 39.5 14 116 -23 -27 17 45 -28 37 32 -26 53 3 -29 1 53 -0.41 - 43 0 0 -28 16 25 23 14 36.8 15 115 -23 -27 36 39 -28 55 59 -27 12 5 -29 20 12 -0.41 - 42 0 0 -28 34 10 23 14 34.1 16 115 -24 -27 54 36 -29 13 31 -27 30 10 -29 37 37 -0.41 - 41 0 0 -28 50 59 23 14 31.1 16 114 -25 -28 11 37 -29 30 9 -27 47 19 -29 54 7 -0.41 - 40 0 0 -29 6 54 23 14 28.1 17 114 -25 -28 27 44 -29 45 53 -28 3 33 -30 9 45 -0.41 - 39 0 0 -29 21 56 23 14 24.9 18 114 -26 -28 42 56 -30 0 45 -28 18 52 -30 24 30 -0.41 - 38 0 0 -29 36 6 23 14 21.6 19 113 -26 -28 57 16 -30 14 44 -28 33 18 -30 38 23 -0.41 - 37 0 0 -29 49 24 23 14 18.1 20 113 -27 -29 10 43 -30 27 53 -28 46 51 -30 51 26 -0.41 - 36 0 0 -30 1 51 23 14 14.6 21 112 -28 -29 23 19 -30 40 11 -28 59 32 -31 3 39 -0.41 - 35 0 0 -30 13 27 23 14 10.9 22 112 -28 -29 35 4 -30 51 40 -29 11 22 -31 15 3 -0.41 - 34 0 0 -30 24 14 23 14 7.1 23 111 -29 -29 45 58 -31 2 19 -29 22 21 -31 25 38 -0.41 - 33 0 0 -30 34 12 23 14 3.2 23 111 -30 -29 56 3 -31 12 10 -29 32 31 -31 35 24 -0.41 - 32 0 0 -30 43 21 23 13 59.1 24 111 -30 -30 5 19 -31 21 12 -29 41 51 -31 44 23 -0.41 - 31 0 0 -30 51 42 23 13 55.0 25 110 -31 -30 13 46 -31 29 28 -29 50 22 -31 52 35 -0.41 - 30 0 0 -30 59 16 23 13 50.7 26 110 -31 -30 21 25 -31 36 56 -29 58 4 -32 0 0 -0.41 - 29 0 0 -31 6 3 23 13 46.3 27 109 -32 -30 28 17 -31 43 38 -30 4 59 -32 6 39 -0.41 - 28 0 0 -31 12 3 23 13 41.8 28 109 -33 -30 34 21 -31 49 33 -30 11 6 -32 12 32 -0.41 - 27 0 0 -31 17 16 23 13 37.2 28 108 -33 -30 39 38 -31 54 43 -30 16 26 -32 17 39 -0.41 - 26 0 0 -31 21 43 23 13 32.5 29 108 -34 -30 44 9 -31 59 7 -30 20 59 -32 22 1 -0.41 - 25 0 0 -31 25 25 23 13 27.7 30 108 -35 -30 47 54 -32 2 46 -30 24 45 -32 25 38 -0.41 - 24 0 0 -31 28 21 23 13 22.8 31 107 -35 -30 50 52 -32 5 40 -30 27 45 -32 28 31 -0.41 - 23 0 0 -31 30 32 23 13 17.7 32 107 -36 -30 53 5 -32 7 49 -30 29 58 -32 30 39 -0.41 - 22 0 0 -31 31 57 23 13 12.6 32 106 -36 -30 54 32 -32 9 13 -30 31 26 -32 32 2 -0.41 - 21 0 0 -31 32 38 23 13 7.3 33 106 -37 -30 55 13 -32 9 53 -30 32 8 -32 32 41 -0.41 - 20 0 0 -31 32 33 23 13 2.0 34 106 -38 -30 55 9 -32 9 48 -30 32 4 -32 32 36 -0.41 - 19 0 0 -31 31 44 23 12 56.5 35 105 -38 -30 54 19 -32 8 59 -30 31 14 -32 31 47 -0.41 - 18 0 0 -31 30 10 23 12 50.9 36 105 -39 -30 52 44 -32 7 25 -30 29 39 -32 30 14 -0.41 - 17 0 0 -31 27 51 23 12 45.2 36 105 -39 -30 50 24 -32 5 7 -30 27 18 -32 27 57 -0.41 - 16 0 0 -31 24 47 23 12 39.4 37 104 -40 -30 47 18 -32 2 5 -30 24 12 -32 24 55 -0.41 - 15 0 0 -31 20 58 23 12 33.4 38 104 -41 -30 43 27 -31 58 18 -30 20 19 -32 21 10 -0.41 - 14 0 0 -31 16 23 23 12 27.4 39 104 -41 -30 38 50 -31 53 46 -30 15 41 -32 16 39 -0.41 - 13 0 0 -31 11 4 23 12 21.2 40 104 -42 -30 33 28 -31 48 30 -30 10 16 -32 11 25 -0.41 - 12 0 0 -31 4 59 23 12 15.0 40 103 -42 -30 27 19 -31 42 28 -30 4 5 -32 5 26 -0.41 - 11 0 0 -30 58 8 23 12 8.6 41 103 -43 -30 20 25 -31 35 42 -29 57 8 -31 58 42 -0.41 - 10 0 0 -30 50 32 23 12 2.1 42 103 -44 -30 12 44 -31 28 10 -29 49 24 -31 51 13 -0.41 - 9 0 0 -30 42 9 23 11 55.4 43 103 -44 -30 4 16 -31 19 52 -29 40 54 -31 42 58 -0.41 - 8 0 0 -30 33 0 23 11 48.7 44 103 -45 -29 55 1 -31 10 49 -29 31 35 -31 33 58 -0.41 - 7 0 0 -30 23 4 23 11 41.8 44 102 -45 -29 44 59 -31 0 59 -29 21 30 -31 24 11 -0.41 - 6 0 0 -30 12 21 23 11 34.8 45 102 -46 -29 34 10 -30 50 22 -29 10 36 -31 13 39 -0.41 - 5 0 0 -30 0 50 23 11 27.7 46 102 -47 -29 22 32 -30 38 58 -28 58 54 -31 2 19 -0.41 - 4 0 0 -29 48 31 23 11 20.4 47 102 -47 -29 10 5 -30 26 47 -28 46 22 -30 50 12 -0.41 - 3 0 0 -29 35 24 23 11 13.0 47 102 -48 -28 56 50 -30 13 47 -28 33 2 -30 37 18 -0.41 - 2 0 0 -29 21 27 23 11 5.5 48 102 -48 -28 42 44 -29 59 59 -28 18 51 -30 23 35 -0.41 - 1 0 0 -29 6 41 23 10 57.8 49 102 -49 -28 27 49 -29 45 22 -28 3 50 -30 9 3 -0.41 0 0 0 -28 51 5 23 10 50.0 50 102 -49 -28 12 3 -29 29 55 -27 47 58 -29 53 42 -0.41 1 0 0 -28 34 38 23 10 42.1 51 102 -50 -27 55 26 -29 13 38 -27 31 15 -29 37 31 -0.41 2 0 0 -28 17 19 23 10 34.0 51 102 -51 -27 37 56 -28 56 30 -27 13 39 -29 20 30 -0.41 3 0 0 -27 59 8 23 10 25.7 52 102 -51 -27 19 34 -28 38 31 -26 55 9 -29 2 37 -0.41 4 0 0 -27 40 5 23 10 17.4 53 102 -52 -27 0 19 -28 19 39 -26 35 47 -28 43 52 -0.41 5 0 0 -27 20 7 23 10 8.8 54 103 -52 -26 40 9 -27 59 54 -26 15 29 -28 24 14 -0.41 6 0 0 -26 59 16 23 10 0.1 54 103 -53 -26 19 4 -27 39 15 -25 54 16 -28 3 43 -0.41 7 0 0 -26 37 29 23 9 51.3 55 103 -54 -25 57 4 -27 17 41 -25 32 7 -27 42 18 -0.41 8 0 0 -26 14 46 23 9 42.3 56 104 -54 -25 34 7 -26 55 12 -25 9 1 -27 19 57 -0.41 9 0 0 -25 51 6 23 9 33.1 57 104 -55 -25 10 12 -26 31 47 -24 44 58 -26 56 41 -0.41 10 0 0 -25 26 28 23 9 23.8 57 105 -55 -24 45 19 -26 7 24 -24 19 55 -26 32 27 -0.41 11 0 0 -25 0 52 23 9 14.3 58 105 -56 -24 19 26 -25 42 3 -23 53 52 -26 7 16 -0.41 12 0 0 -24 34 15 23 9 4.6 59 106 -56 -23 52 34 -25 15 43 -23 26 49 -25 41 6 -0.41 13 0 0 -24 6 38 23 8 54.8 60 107 -57 -23 24 39 -24 48 23 -22 58 44 -25 13 56 -0.41 14 0 0 -23 37 59 23 8 44.8 60 108 -57 -22 55 42 -24 20 2 -22 29 36 -24 45 46 -0.41 15 0 0 -23 8 18 23 8 34.6 61 109 -58 -22 25 42 -23 50 39 -21 59 24 -24 16 33 -0.41 16 0 0 -22 37 32 23 8 24.3 62 110 -59 -21 54 37 -23 20 12 -21 28 7 -23 46 18 -0.41 17 0 0 -22 5 41 23 8 13.7 62 111 -59 -21 22 27 -22 48 41 -20 55 44 -23 14 58 -0.41 18 0 0 -21 32 44 23 8 3.0 63 112 -60 -20 49 9 -22 16 4 -20 22 14 -22 42 34 -0.41 19 0 0 -20 58 40 23 7 52.1 63 113 -60 -20 14 43 -21 42 20 -19 47 35 -22 9 3 -0.41 20 0 0 -20 23 27 23 7 41.0 64 115 -61 -19 39 8 -21 7 29 -19 11 46 -21 34 25 -0.41 21 0 0 -19 47 4 23 7 29.7 65 117 -61 -19 2 23 -20 31 29 -18 34 47 -20 58 38 -0.41 22 0 0 -19 9 31 23 7 18.2 65 118 -61 -18 24 26 -19 54 18 -17 56 35 -20 21 42 -0.41 23 0 0 -18 30 45 23 7 6.5 66 120 -62 -17 45 16 -19 15 56 -17 17 10 -19 43 34 -0.41 24 0 0 -17 50 46 23 6 54.7 66 122 -62 -17 4 52 -18 36 22 -16 36 30 -19 4 14 -0.41 25 0 0 -17 9 32 23 6 42.6 66 124 -63 -16 23 12 -17 55 33 -15 54 34 -18 23 41 -0.41 26 0 0 -16 27 3 23 6 30.4 67 127 -63 -15 40 16 -17 13 30 -15 11 22 -17 41 54 -0.41 27 0 0 -15 43 16 23 6 17.9 67 129 -63 -14 56 2 -16 30 10 -14 26 50 -16 58 50 -0.41 28 0 0 -14 58 11 23 6 5.3 67 131 -64 -14 10 29 -15 45 33 -13 41 0 -16 14 30 -0.41 29 0 0 -14 11 47 23 5 52.5 67 134 -64 -13 23 36 -14 59 38 -12 53 48 -15 28 52 -0.41 30 0 0 -13 24 3 23 5 39.5 67 137 -64 -12 35 21 -14 12 22 -12 5 15 -14 41 54 -0.41 31 0 0 -12 34 56 23 5 26.4 67 139 -64 -11 45 44 -13 23 46 -11 15 18 -13 53 36 -0.41 32 0 0 -11 44 27 23 5 13.0 67 142 -65 -10 54 43 -12 33 48 -10 23 57 -13 3 56 -0.42 33 0 0 -10 52 34 23 4 59.5 67 145 -65 -10 2 17 -11 42 26 - 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Uncertainty in time = +/- 4 secs Prediction of 2023 Feb 15.9 Data for the target star ------------------------ * name: TYC 6695-00220-1 * constellation : Hydra * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 12 36 26.7029 DE: -28 49 58.723 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 12 36 26.7029 DE: -28 49 58.724 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 9.3 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (426) Hippo asteroid class: approx. diameter [km]: 128 approx. diameter ["]: 0.097 distance from Earth [AU]: 1.82020 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#124 date of fit: 2023 Feb 07 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): 0.030", 0.002", 120.589° remarks: * orbital elements for (426)Hippo : Mean anomaly = 10.4912808390 deg Arg. of pericenter = 221.6379831525 deg Long. of node = 311.3237092843 deg Inclination = 19.4963752373 deg Eccentricity = 0.1059659487 Semimajor axis = 2.8888187014 AU Perihelion dist = 2.5827022869 AU Mag: H = 8.59, G = 0.15 Epoch of elements : MJD 60000.96201389 TDT (2023 Feb 25.9620) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1242023Feb07,12.29,2023,2,25,23.092055,-0.282971,0.257732,-3.946166,-4.332914,-0.002901,0.003178,0.000001,0.000000 47.4920,-28.9599,-163.13,-8.91,False TYC 6695-00220-1,12.60741746,-28.8329785,0.00,9.32,0.00,0.0,0,,12.62804974,-28.9598707,3.59,0.00,0,0,0 426,Hippo,12.87,127.6,1.8202,0,0,-1.453,-20.93,,7.4,0 0,10.2982,2023,2,25,221.6380,311.3237,19.4964,0.10597,2.88882,2.58270,8.62,5.0,0.15 1.307,0.0303,0.0023,121,0.0297,Known errors,-1.00,-1,-1,-1 20230225_0220-1,59990.86 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Feb 15, 20:40 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org