IOTA/IOTA-ES occultation update for (909) Ulla / TYC 4688-00077-1 event on 2024 Feb 01, 22:12 UT Visible from Summary ------- On 2024 Feb 01 UT, the 116.554 km diameter asteroid (909) Ulla will occult a 11.8 mag star in the constellation Cetus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 3.15 mag to 14.90 mag (the magnitude of the asteroid) for at most 4.390 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: 2024 Feb 01, 22:08 - 2024 Feb 01, 22:15 * geocentric midpoint of event [JD]: 2460342.42502850 * magnitude of target star: 11.81 * magnitude drop [mag]: 3.15 * estimated maximum duration [s]: 4.390 * Moon: 59 % sunlit, 160° distance * Sun: 72° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 133 * 1 sigma uncertainty interval [path widths]: +/- 0.15 * 1 sigma uncertainty interval [seconds]: +/- 1.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.017, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.017", 0.002", 80°) * approx speed of asteroid's shadow [km/s]: 26.5431 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 4688-00077-1 by 909 Ulla on 2024 Feb 1 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 -166 0 0 - 4 16 42 22 8 32.5 0 97 69 - 4 53 1 - 3 40 10 - 5 3 36 - 3 29 26 .... -165 0 0 - 4 23 33 22 8 32.6 1 97 70 - 4 59 50 - 3 47 4 - 5 10 25 - 3 36 21 -0.27 -164 0 0 - 4 29 44 22 8 32.7 2 97 70 - 5 5 58 - 3 53 18 - 5 16 33 - 3 42 35 -0.41 -163 0 0 - 4 35 15 22 8 32.9 3 97 71 - 5 11 27 - 3 58 50 - 5 22 0 - 3 48 8 -0.46 -162 0 0 - 4 40 5 22 8 33.2 4 97 72 - 5 16 15 - 4 3 42 - 5 26 48 - 3 53 0 -0.48 -161 0 0 - 4 44 14 22 8 33.6 5 96 73 - 5 20 23 - 4 7 53 - 5 30 56 - 3 57 11 -0.50 -160 0 0 - 4 47 43 22 8 34.1 6 96 73 - 5 23 51 - 4 11 23 - 5 34 23 - 4 0 42 -0.51 -159 0 0 - 4 50 32 22 8 34.6 7 96 74 - 5 26 38 - 4 14 12 - 5 37 10 - 4 3 31 -0.52 -158 0 0 - 4 52 39 22 8 35.3 8 96 75 - 5 28 45 - 4 16 21 - 5 39 17 - 4 5 40 -0.52 -157 0 0 - 4 54 7 22 8 36.0 9 96 75 - 5 30 12 - 4 17 48 - 5 40 44 - 4 7 8 -0.53 -156 0 0 - 4 54 53 22 8 36.8 10 96 76 - 5 30 59 - 4 18 35 - 5 41 30 - 4 7 55 -0.53 -155 0 0 - 4 54 59 22 8 37.7 11 96 76 - 5 31 5 - 4 18 41 - 5 41 37 - 4 8 0 -0.53 -154 0 0 - 4 54 24 22 8 38.7 12 96 77 - 5 30 30 - 4 18 6 - 5 41 2 - 4 7 25 -0.54 -153 0 0 - 4 53 9 22 8 39.7 13 96 77 - 5 29 16 - 4 16 50 - 5 39 48 - 4 6 9 -0.54 -152 0 0 - 4 51 13 22 8 40.8 14 96 77 - 5 27 20 - 4 14 52 - 5 37 53 - 4 4 11 -0.54 -151 0 0 - 4 48 36 22 8 42.0 15 96 78 - 5 24 44 - 4 12 14 - 5 35 17 - 4 1 32 -0.54 -150 0 0 - 4 45 18 22 8 43.3 16 96 78 - 5 21 28 - 4 8 54 - 5 32 1 - 3 58 12 -0.54 -149 0 0 - 4 41 19 22 8 44.7 17 96 78 - 5 17 31 - 4 4 53 - 5 28 5 - 3 54 11 -0.54 -148 0 0 - 4 36 38 22 8 46.2 18 96 78 - 5 12 53 - 4 0 11 - 5 23 27 - 3 49 28 -0.55 -147 0 0 - 4 31 17 22 8 47.7 19 96 77 - 5 7 34 - 3 54 48 - 5 18 9 - 3 44 4 -0.55 -146 0 0 - 4 25 15 22 8 49.3 20 96 77 - 5 1 34 - 3 48 43 - 5 12 10 - 3 37 58 -0.55 -145 0 0 - 4 18 31 22 8 51.0 21 96 77 - 4 54 54 - 3 41 56 - 5 5 30 - 3 31 10 -0.55 -144 0 0 - 4 11 6 22 8 52.8 22 96 76 - 4 47 32 - 3 34 28 - 4 58 9 - 3 23 41 -0.55 -143 0 0 - 4 3 0 22 8 54.7 23 96 76 - 4 39 29 - 3 26 18 - 4 50 7 - 3 15 30 -0.55 -142 0 0 - 3 54 12 22 8 56.6 24 96 75 - 4 30 44 - 3 17 26 - 4 41 24 - 3 6 37 -0.55 -141 0 0 - 3 44 42 22 8 58.6 25 96 75 - 4 21 19 - 3 7 52 - 4 32 0 - 2 57 2 -0.55 -140 0 0 - 3 34 31 22 9 0.7 26 96 74 - 4 11 12 - 2 57 36 - 4 21 54 - 2 46 45 -0.55 -139 0 0 - 3 23 37 22 9 2.9 27 96 73 - 4 0 23 - 2 46 38 - 4 11 7 - 2 35 45 -0.55 -138 0 0 - 3 12 2 22 9 5.2 28 96 72 - 3 48 53 - 2 34 58 - 3 59 38 - 2 24 4 -0.55 -137 0 0 - 2 59 45 22 9 7.5 29 96 72 - 3 36 41 - 2 22 36 - 3 47 27 - 2 11 40 -0.55 -136 0 0 - 2 46 46 22 9 10.0 30 96 71 - 3 23 47 - 2 9 31 - 3 34 35 - 1 58 33 -0.56 -135 0 0 - 2 33 4 22 9 12.5 31 96 70 - 3 10 11 - 1 55 43 - 3 21 1 - 1 44 44 -0.56 -134 0 0 - 2 18 40 22 9 15.1 32 97 69 - 2 55 53 - 1 41 13 - 3 6 44 - 1 30 12 -0.56 -133 0 0 - 2 3 34 22 9 17.7 33 97 68 - 2 40 53 - 1 26 1 - 2 51 46 - 1 14 58 -0.56 -132 0 0 - 1 47 45 22 9 20.5 34 97 67 - 2 25 11 - 1 10 5 - 2 36 6 - 0 59 0 -0.56 -131 0 0 - 1 31 14 22 9 23.3 35 97 66 - 2 8 46 - 0 53 27 - 2 19 43 - 0 42 20 -0.56 -130 0 0 - 1 14 0 22 9 26.2 36 98 66 - 1 51 39 - 0 36 6 - 2 2 38 - 0 24 57 -0.56 -129 0 0 - 0 56 3 22 9 29.2 37 98 65 - 1 33 50 - 0 18 1 - 1 44 51 - 0 6 50 -0.56 -128 0 0 - 0 37 24 22 9 32.3 38 98 64 - 1 15 18 0 0 46 - 1 26 21 0 11 59 -0.56 -127 0 0 - 0 18 1 22 9 35.5 39 99 63 - 0 56 4 0 20 16 - 1 7 9 0 31 32 -0.56 -126 0 0 0 2 4 22 9 38.7 40 99 62 - 0 36 7 0 40 29 - 0 47 15 0 51 48 -0.56 -125 0 0 0 22 52 22 9 42.0 40 99 61 - 0 15 27 1 1 26 - 0 26 38 1 12 47 -0.56 -124 0 0 0 44 23 22 9 45.4 41 100 60 0 5 55 1 23 6 - 0 5 18 1 34 29 -0.56 -123 0 0 1 6 36 22 9 48.8 42 100 59 0 28 0 1 45 28 0 16 44 1 56 54 -0.56 -122 0 0 1 29 33 22 9 52.4 43 101 58 0 50 47 2 8 34 0 39 29 2 20 3 -0.56 -121 0 0 1 53 12 22 9 56.0 44 101 56 1 14 17 2 32 23 1 2 56 2 43 55 -0.56 -120 0 0 2 17 34 22 9 59.7 45 102 55 1 38 29 2 56 55 1 27 6 3 8 29 -0.56 -119 0 0 2 42 38 22 10 3.4 46 103 54 2 3 24 3 22 9 1 51 57 3 33 47 -0.56 -118 0 0 3 8 25 22 10 7.3 47 104 53 2 29 1 3 48 6 2 17 31 3 59 47 -0.56 -117 0 0 3 34 55 22 10 11.2 48 104 52 2 55 20 4 14 46 2 43 47 4 26 30 -0.56 -116 0 0 4 2 6 22 10 15.1 49 105 51 3 22 21 4 42 8 3 10 45 4 53 55 -0.56 -115 0 0 4 29 59 22 10 19.2 49 106 50 3 50 4 5 10 13 3 38 25 5 22 3 -0.56 -114 0 0 4 58 35 22 10 23.3 50 107 49 4 18 28 5 38 59 4 6 46 5 50 52 -0.56 -113 0 0 5 27 51 22 10 27.5 51 108 48 4 47 33 6 8 27 4 35 48 6 20 24 -0.56 -112 0 0 5 57 49 22 10 31.7 52 109 47 5 17 20 6 38 36 5 5 31 6 50 36 -0.56 -111 0 0 6 28 27 22 10 36.0 53 110 45 5 47 47 7 9 26 5 35 55 7 21 29 -0.56 -110 0 0 6 59 46 22 10 40.4 53 112 44 6 18 54 7 40 56 6 6 59 7 53 3 -0.56 -109 0 0 7 31 44 22 10 44.8 54 113 43 6 50 40 8 13 7 6 38 42 8 25 18 -0.56 -108 0 0 8 4 22 22 10 49.3 55 114 42 7 23 7 8 45 57 7 11 5 8 58 11 -0.56 -107 0 0 8 37 39 22 10 53.8 56 116 41 7 56 11 9 19 26 7 44 6 9 31 44 -0.56 -106 0 0 9 11 34 22 10 58.4 56 117 40 8 29 54 9 53 33 8 17 46 10 5 55 -0.56 -105 0 0 9 46 7 22 11 3.1 57 119 39 9 4 15 10 28 18 8 52 3 10 40 44 -0.56 -104 0 0 10 21 16 22 11 7.7 57 121 37 9 39 12 11 3 40 9 26 57 11 16 9 -0.56 -103 0 0 10 57 2 22 11 12.5 58 123 36 10 14 46 11 39 38 10 2 27 11 52 11 -0.56 -102 0 0 11 33 23 22 11 17.2 59 124 35 10 50 55 12 16 12 10 38 32 12 28 49 -0.56 -101 0 0 12 10 19 22 11 22.0 59 126 34 11 27 38 12 53 20 11 15 12 13 6 1 -0.56 -100 0 0 12 47 48 22 11 26.9 59 128 33 12 4 55 13 31 2 11 52 25 13 43 46 -0.56 - 99 0 0 13 25 49 22 11 31.8 60 131 32 12 42 44 14 9 16 12 30 11 14 22 4 -0.56 - 98 0 0 14 4 22 22 11 36.7 60 133 30 13 21 5 14 48 2 13 8 28 15 0 53 -0.56 - 97 0 0 14 43 26 22 11 41.6 60 135 29 13 59 56 15 27 18 13 47 16 15 40 13 -0.56 - 96 0 0 15 22 59 22 11 46.5 61 137 28 14 39 17 16 7 3 14 26 33 16 20 2 -0.56 - 95 0 0 16 2 59 22 11 51.5 61 140 27 15 19 6 16 47 16 15 6 18 17 0 18 -0.56 - 94 0 0 16 43 26 22 11 56.5 61 142 26 15 59 21 17 27 55 15 46 30 17 41 1 -0.56 - 93 0 0 17 24 19 22 12 1.5 61 145 25 16 40 2 18 8 59 16 27 8 18 22 9 -0.56 - 92 0 0 18 5 35 22 12 6.4 61 147 23 17 21 7 18 50 27 17 8 9 19 3 41 -0.56 - 91 0 0 18 47 14 22 12 11.4 61 149 22 18 2 34 19 32 17 17 49 33 19 45 34 -0.56 - 90 0 0 19 29 13 22 12 16.4 61 152 21 18 44 22 20 14 28 18 31 18 20 27 48 -0.56 - 89 0 0 20 11 31 22 12 21.4 60 154 20 19 26 30 20 56 58 19 13 23 21 10 21 -0.56 - 88 0 0 20 54 8 22 12 26.3 60 157 19 20 8 55 21 39 44 19 55 46 21 53 11 -0.56 - 87 0 0 21 36 59 22 12 31.3 60 159 17 20 51 37 22 22 47 20 38 24 22 36 16 -0.56 - 86 0 0 22 20 5 22 12 36.2 59 161 16 21 34 33 23 6 3 21 21 18 23 19 35 -0.56 - 85 0 0 23 3 24 22 12 41.1 59 164 15 22 17 42 23 49 31 22 4 24 24 3 6 -0.56 - 84 0 0 23 46 52 22 12 45.9 59 166 14 23 1 2 24 33 9 22 47 41 24 46 47 -0.56 - 83 0 0 24 30 29 22 12 50.8 58 168 13 23 44 30 25 16 55 23 31 7 25 30 36 -0.56 - 82 0 0 25 14 13 22 12 55.5 58 170 12 24 28 6 26 0 47 24 14 40 26 14 31 -0.56 - 81 0 0 25 58 2 22 13 0.3 57 172 11 25 11 47 26 44 44 24 58 19 26 58 30 -0.56 - 80 0 0 26 41 54 22 13 5.0 56 174 9 25 55 31 27 28 43 25 42 1 27 42 31 -0.56 - 79 0 0 27 25 46 22 13 9.6 56 176 8 26 39 17 28 12 42 26 25 45 28 26 33 -0.56 - 78 0 0 28 9 38 22 13 14.2 55 178 7 27 23 2 28 56 40 27 9 28 29 10 33 -0.56 - 77 0 0 28 53 27 22 13 18.7 54 180 6 28 6 45 29 40 35 27 53 10 29 54 29 -0.56 - 76 0 0 29 37 10 22 13 23.2 54 181 5 28 50 24 30 24 24 28 36 47 30 38 20 -0.56 - 75 0 0 30 20 47 22 13 27.6 53 183 4 29 33 56 31 8 6 29 20 18 31 22 3 -0.56 - 74 0 0 31 4 16 22 13 31.9 52 185 3 30 17 21 31 51 38 30 3 41 32 5 37 -0.56 - 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47 0 0 48 11 3 22 14 56.4 29 215 -21 47 25 59 48 56 32 47 12 52 49 9 56 -0.55 - 46 0 0 48 41 23 22 14 58.3 28 216 -22 47 56 29 49 26 40 47 43 25 49 40 1 -0.55 - 45 0 0 49 11 5 22 15 0.1 27 217 -23 48 26 22 49 56 11 48 13 21 50 9 29 -0.55 - 44 0 0 49 40 9 22 15 1.9 27 218 -23 48 55 38 50 25 5 48 42 39 50 38 19 -0.55 - 43 0 0 50 8 37 22 15 3.6 26 218 -24 49 24 16 50 53 20 49 11 21 51 6 31 -0.55 - 42 0 0 50 36 27 22 15 5.3 25 219 -25 49 52 18 51 20 59 49 39 26 51 34 6 -0.55 - 41 0 0 51 3 39 22 15 6.8 24 220 -25 50 19 42 51 48 0 50 6 54 52 1 4 -0.56 - 40 0 0 51 30 15 22 15 8.3 24 221 -26 50 46 30 52 14 24 50 33 45 52 27 24 -0.56 - 39 0 0 51 56 15 22 15 9.8 23 222 -26 51 12 41 52 40 11 50 59 59 52 53 8 -0.56 - 38 0 0 52 21 38 22 15 11.1 22 223 -27 51 38 16 53 5 22 51 25 38 53 18 15 -0.56 - 37 0 0 52 46 25 22 15 12.4 21 224 -28 52 3 15 53 29 57 51 50 40 53 42 46 -0.56 - 36 0 0 53 10 36 22 15 13.7 21 225 -28 52 27 38 53 53 56 52 15 7 54 6 41 -0.56 - 35 0 0 53 34 12 22 15 14.9 20 225 -29 52 51 26 54 17 19 52 38 58 54 30 1 -0.56 - 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8 0 0 60 54 46 22 15 30.9 4 249 -39 60 16 47 61 33 0 60 5 42 61 44 15 -0.57 - 7 0 0 61 4 48 22 15 31.1 3 250 -39 60 26 57 61 42 53 60 15 54 61 54 6 -0.57 - 6 0 0 61 14 26 22 15 31.2 3 250 -39 60 36 43 61 52 24 60 25 43 62 3 34 -0.57 - 5 0 0 61 23 42 22 15 31.3 2 251 -39 60 46 6 62 1 32 60 35 8 62 12 40 -0.58 - 4 0 0 61 32 36 22 15 31.4 2 252 -40 60 55 7 62 10 19 60 44 11 62 21 24 -0.58 - 3 0 0 61 41 7 22 15 31.4 1 253 -40 61 3 45 62 18 43 60 52 51 62 29 47 -0.60 - 2 0 0 61 49 17 22 15 31.5 1 254 -40 61 12 2 62 26 46 61 1 10 62 37 47 -0.62 - 1 0 0 61 57 5 22 15 31.5 0 255 -40 61 19 56 62 34 27 61 9 6 62 45 27 -0.74 - 0 0 0 .. .. .... .. .. .. .. .. .. .. .. .. .. .. .. 61 16 41 .. .. .. .... Uncertainty in time = +/- 2 secs Prediction of 2023 Jul 13.1 Data for the target star ------------------------ * name: TYC 4688-00077-1 * constellation : Cetus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 01 51 24.4237 DE: -06 58 56.669 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 01 51 24.4235 DE: -06 58 56.669 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.8 * B mag [mag]: 12.1 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (909) Ulla asteroid class: approx. diameter [km]: 117 approx. diameter ["]: 0.047 distance from Earth [AU]: 3.41060 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#123 date of fit: 2023 Apr 27 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): 0.017", 0.002", 79.915° remarks: * orbital elements for (909)Ulla : Mean anomaly = 19.6316920284 deg Arg. of pericenter = 231.7115249706 deg Long. of node = 146.2542643492 deg Inclination = 18.7655007565 deg Eccentricity = 0.0935629333 Semimajor axis = 3.5520700647 AU Perihelion dist = 3.2197279703 AU Mag: H = 8.79, G = 0.15 Epoch of elements : MJD 60341.92502880 TDT (2024 Feb 01.9250) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1232023Apr27,4.39,2024,2,1,22.200684,-0.268004,0.406784,12.504596,8.251375,0.005519,0.001565,0.000000,-0.000001 -76.4779,-6.8655,-149.62,-17.04,False TYC 4688-00077-1,1.85678438,-6.9824078,12.10,11.81,11.65,0.0,0,,1.87671720,-6.8655032,3.15,2.88,0,0,0 909,Ulla,14.90,116.554,3.4106,0,0,2.165,21.28,,6.4,0 0,19.4955,2024,2,1,231.7115,146.2543,18.7655,0.09356,3.55207,3.21973,8.79,5.0,0.15 1.146,0.0170,0.0016,80,0.0069,Known errors,1.36,0,-1,-1 20240201_0077-1,60138.15 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 13, 03:36 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org