IOTA/IOTA-ES occultation update for (4151) Alanhale / TYC 5558-00995-1 event on 2024 Apr 04, 20:25 UT Visible from Summary ------- On 2024 Apr 04 UT, the 19.3622475418388 km diameter asteroid (4151) Alanhale will occult a 8.8 mag star in the constellation Virgo for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 7.88 mag to 16.71 mag (the magnitude of the asteroid) for at most 1.920 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: 73 * date and approx. time of event: 2024 Apr 04, 20:15 - 2024 Apr 04, 20:36 * geocentric midpoint of event [JD]: 2460405.35130000 * magnitude of target star: 8.83 * magnitude drop [mag]: 7.88 * estimated maximum duration [s]: 1.920 * Moon: 21 % sunlit, 106° distance * Sun: 160° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 20 * 1 sigma uncertainty interval [path widths]: +/- 0.78 * 1 sigma uncertainty interval [seconds]: +/- 4.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.030, +/- 0.016) * 1 sigma uncertainty ellipse (major, minor, PA): (0.032", 0.011", 113°) * approx speed of asteroid's shadow [km/s]: 10.1673 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5558-00995-1 by 4151 Alanhale on 2024 Apr 4 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 - 13 0 0 23 8 52 20 36 16.7 1 104 -21 23 14 20 23 3 24 23 22 50 22 54 54 .... - 12 0 0 22 55 3 20 36 16.4 2 104 -21 23 0 32 22 49 35 23 9 3 22 41 4 -0.02 - 11 0 0 22 40 55 20 36 16.0 3 105 -22 22 46 24 22 35 26 22 54 56 22 26 55 -0.05 - 10 0 0 22 26 28 20 36 15.4 4 105 -23 22 31 57 22 20 58 22 40 29 22 12 26 -0.06 - 9 0 0 22 11 41 20 36 14.7 5 105 -24 22 17 11 22 6 11 22 25 44 21 57 39 -0.07 - 8 0 0 21 56 35 20 36 13.8 6 106 -25 22 2 6 21 51 5 22 10 39 21 42 32 -0.07 - 7 0 0 21 41 11 20 36 12.6 7 106 -26 21 46 41 21 35 40 21 55 16 21 27 6 -0.08 - 6 0 0 21 25 28 20 36 11.4 8 107 -27 21 30 59 21 19 56 21 39 34 21 11 22 -0.08 - 5 0 0 21 9 26 20 36 9.9 8 107 -28 21 14 58 21 3 54 21 23 33 20 55 19 -0.08 - 4 0 0 20 53 6 20 36 8.2 9 107 -29 20 58 38 20 47 34 21 7 15 20 38 58 -0.08 - 3 0 0 20 36 28 20 36 6.4 10 108 -30 20 42 1 20 30 56 20 50 38 20 22 19 -0.09 - 2 0 0 20 19 33 20 36 4.4 11 108 -31 20 25 6 20 14 0 20 33 43 20 5 22 -0.09 - 1 0 0 20 2 20 20 36 2.2 12 108 -32 20 7 53 19 56 46 20 16 31 19 48 8 -0.09 0 0 0 19 44 49 20 35 59.8 13 109 -33 19 50 23 19 39 15 19 59 2 19 30 37 -0.09 1 0 0 19 27 2 20 35 57.3 14 109 -34 19 32 36 19 21 27 19 41 16 19 12 48 -0.09 2 0 0 19 8 57 20 35 54.5 15 109 -35 19 14 32 19 3 23 19 23 13 18 54 43 -0.09 3 0 0 18 50 37 20 35 51.6 16 110 -36 18 56 12 18 45 2 19 4 53 18 36 21 -0.09 4 0 0 18 32 0 20 35 48.5 17 110 -37 18 37 36 18 26 24 18 46 17 18 17 43 -0.09 5 0 0 18 13 7 20 35 45.2 18 110 -38 18 18 43 18 7 31 18 27 25 17 58 49 -0.09 6 0 0 17 53 59 20 35 41.7 19 111 -39 17 59 35 17 48 23 18 8 18 17 39 40 -0.09 7 0 0 17 34 35 20 35 38.0 20 111 -40 17 40 12 17 28 59 17 48 56 17 20 15 -0.09 8 0 0 17 14 57 20 35 34.1 21 111 -41 17 20 34 17 9 20 17 29 18 17 0 36 -0.09 9 0 0 16 55 4 20 35 30.1 22 111 -42 17 0 41 16 49 26 17 9 26 16 40 42 -0.09 10 0 0 16 34 56 20 35 25.9 23 112 -43 16 40 34 16 29 18 16 49 19 16 20 33 -0.10 11 0 0 16 14 35 20 35 21.4 24 112 -44 16 20 13 16 8 57 16 28 59 16 0 11 -0.10 12 0 0 15 54 0 20 35 16.8 25 112 -45 15 59 39 15 48 21 16 8 25 15 39 35 -0.10 13 0 0 15 33 12 20 35 12.1 26 113 -46 15 38 51 15 27 33 15 47 38 15 18 46 -0.10 14 0 0 15 12 11 20 35 7.1 27 113 -47 15 17 50 15 6 32 15 26 38 14 57 45 -0.10 15 0 0 14 50 58 20 35 1.9 28 113 -48 14 56 38 14 45 18 15 5 26 14 36 31 -0.10 16 0 0 14 29 33 20 34 56.6 29 113 -49 14 35 13 14 23 53 14 44 1 14 15 5 -0.10 17 0 0 14 7 56 20 34 51.1 30 114 -50 14 13 36 14 2 16 14 22 25 13 53 27 -0.10 18 0 0 13 46 8 20 34 45.4 31 114 -51 13 51 49 13 40 28 14 0 38 13 31 39 -0.10 19 0 0 13 24 10 20 34 39.5 32 114 -52 13 29 50 13 18 29 13 38 40 13 9 39 -0.10 20 0 0 13 2 1 20 34 33.5 33 115 -53 13 7 42 12 56 20 13 16 32 12 47 30 -0.10 21 0 0 12 39 42 20 34 27.2 34 115 -54 12 45 23 12 34 1 12 54 14 12 25 11 -0.10 22 0 0 12 17 14 20 34 20.8 35 115 -55 12 22 56 12 11 33 12 31 47 12 2 42 -0.10 23 0 0 11 54 37 20 34 14.3 36 115 -56 12 0 19 11 48 55 12 9 10 11 40 4 -0.10 24 0 0 11 31 52 20 34 7.5 37 116 -57 11 37 34 11 26 10 11 46 25 11 17 18 -0.10 25 0 0 11 8 58 20 34 0.6 38 116 -58 11 14 40 11 3 16 11 23 32 10 54 25 -0.10 26 0 0 10 45 57 20 33 53.5 39 116 -59 10 51 40 10 40 15 11 0 32 10 31 23 -0.10 27 0 0 10 22 50 20 33 46.3 40 116 -60 10 28 32 10 17 7 10 37 25 10 8 15 -0.10 28 0 0 9 59 35 20 33 38.9 41 117 -61 10 5 18 9 53 53 10 14 11 9 45 0 -0.10 29 0 0 9 36 15 20 33 31.3 42 117 -62 9 41 58 9 30 32 9 50 50 9 21 39 -0.10 30 0 0 9 12 49 20 33 23.6 44 117 -63 9 18 32 9 7 6 9 27 25 8 58 13 -0.10 31 0 0 8 49 18 20 33 15.7 45 117 -64 8 55 1 8 43 35 9 3 54 8 34 42 -0.10 32 0 0 8 25 42 20 33 7.7 46 117 -65 8 31 26 8 19 59 8 40 19 8 11 6 -0.10 33 0 0 8 2 3 20 32 59.5 47 118 -66 8 7 46 7 56 20 8 16 40 7 47 27 -0.10 34 0 0 7 38 20 20 32 51.2 48 118 -67 7 44 3 7 32 37 7 52 57 7 23 44 -0.10 35 0 0 7 14 34 20 32 42.7 49 118 -68 7 20 18 7 8 51 7 29 11 6 59 58 -0.10 36 0 0 6 50 46 20 32 34.1 50 118 -69 6 56 29 6 45 3 7 5 23 6 36 9 -0.10 37 0 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0 0 -16 45 49 20 16 10.3 21 263 -1 -16 40 29 -16 51 9 -16 32 12 -16 59 26 -0.09 148 0 0 -16 40 28 20 16 6.6 20 263 0 -16 35 8 -16 45 48 -16 26 50 -16 54 5 -0.09 149 0 0 -16 34 44 20 16 3.0 19 262 0 -16 29 24 -16 40 4 -16 21 6 -16 48 22 -0.09 150 0 0 -16 28 38 20 15 59.7 18 262 1 -16 23 17 -16 33 58 -16 14 59 -16 42 16 -0.09 151 0 0 -16 22 9 20 15 56.4 17 262 2 -16 16 49 -16 27 30 -16 8 30 -16 35 48 -0.09 152 0 0 -16 15 18 20 15 53.4 16 261 3 -16 9 57 -16 20 39 -16 1 38 -16 28 58 -0.09 153 0 0 -16 8 5 20 15 50.5 16 261 4 -16 2 44 -16 13 26 -15 54 24 -16 21 45 -0.09 154 0 0 -16 0 29 20 15 47.7 15 261 5 -15 55 8 -16 5 50 -15 46 48 -16 14 10 -0.09 155 0 0 -15 52 31 20 15 45.2 14 261 6 -15 47 9 -15 57 52 -15 38 49 -16 6 12 -0.09 156 0 0 -15 44 10 20 15 42.8 13 260 7 -15 38 48 -15 49 32 -15 30 27 -15 57 52 -0.09 157 0 0 -15 35 27 20 15 40.5 12 260 8 -15 30 5 -15 40 49 -15 21 43 -15 49 10 -0.09 158 0 0 -15 26 21 20 15 38.5 11 260 9 -15 20 59 -15 31 44 -15 12 37 -15 40 5 -0.09 159 0 0 -15 16 53 20 15 36.6 10 260 10 -15 11 30 -15 22 16 -15 3 8 -15 30 38 -0.09 160 0 0 -15 7 3 20 15 34.8 9 259 11 -15 1 39 -15 12 26 -14 53 17 -15 20 49 -0.09 161 0 0 -14 56 50 20 15 33.3 8 259 12 -14 51 26 -15 2 14 -14 43 3 -15 10 37 -0.09 162 0 0 -14 46 15 20 15 31.9 7 259 13 -14 40 51 -14 51 39 -14 32 27 -15 0 2 -0.09 163 0 0 -14 35 17 20 15 30.7 6 259 14 -14 29 53 -14 40 41 -14 21 28 -14 49 6 -0.09 164 0 0 -14 23 57 20 15 29.7 5 258 15 -14 18 32 -14 29 22 -14 10 7 -14 37 47 -0.09 165 0 0 -14 12 15 20 15 28.9 4 258 16 -14 6 50 -14 17 40 -13 58 24 -14 26 5 -0.09 166 0 0 -14 0 10 20 15 28.3 3 258 17 -13 54 45 -14 5 36 -13 46 18 -14 14 2 -0.09 167 0 0 -13 47 44 20 15 27.8 2 258 18 -13 42 18 -13 53 10 -13 33 51 -14 1 36 -0.08 168 0 0 -13 34 55 20 15 27.5 1 257 19 -13 29 28 -13 40 21 -13 21 1 -13 48 49 -0.07 Uncertainty in time = +/- 4 secs Prediction of 2023 Jul 14.3 Data for the target star ------------------------ * name: TYC 5558-00995-1 * constellation : Virgo * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 14 12 19.4130 DE: -12 19 15.613 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 14 12 19.4131 DE: -12 19 15.613 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 8.8 * B mag [mag]: 9.4 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (4151) Alanhale asteroid class: approx. diameter [km]: 19 approx. diameter ["]: 0.014 distance from Earth [AU]: 1.92690 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#50 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): 0.032", 0.011", 112.7° remarks: * orbital elements for (4151)Alanhale : Mean anomaly = 50.2316643090 deg Arg. of pericenter = 76.4307542066 deg Long. of node = 66.8843873550 deg Inclination = 1.0020131648 deg Eccentricity = 0.1492338836 Semimajor axis = 3.1401182853 AU Perihelion dist = 2.6715062386 AU Mag: H = 12.48, G = 0.15 Epoch of elements : MJD 60404.85129971 TDT (2024 Apr 04.8513) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#502023Apr24,1.92,2024,4,4,20.431200,0.028303,0.084003,-5.435432,1.840836,-0.001908,0.000581,0.000001,0.000000 73.3020,-12.4367,-125.78,6.12,False TYC 5558-00995-1,14.20539250,-12.3210035,9.43,8.83,8.51,0.1,0,,14.22741915,-12.4367125,7.88,7.76,0,0,0 4151,Alanhale,16.71,19.502,1.9269,0,0,-1.694,8.40,,1.0,0 0,50.0809,2024,4,4,76.4308,66.8844,1.0020,0.14923,3.14012,2.67151,12.48,5.0,0.15 1.777,0.0323,0.0107,113,0.0109,Known errors,1.03,0,-1,-1 20240404_0995-1,60139.27 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 14, 06:34 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org