IOTA/IOTA-ES occultation update for (1551) Argelander / UCAC4 331-126197 event on 2024 Oct 12, 20:16 UT Visible from Summary ------- On 2024 Oct 12 UT, the 10.238 km diameter asteroid (1551) Argelander will occult a 11.4 mag star in the constellation Sagittarius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 5.62 mag to 17.02 mag (the magnitude of the asteroid) for at most 0.360 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 Oct 12, 20:13 - 2024 Oct 12, 20:20 * geocentric midpoint of event [JD]: 2460596.34490154 * magnitude of target star: 11.41 * magnitude drop [mag]: 5.62 * estimated maximum duration [s]: 0.360 * Moon: 72 % sunlit, 46° distance * Sun: 70° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 11 * 1 sigma uncertainty interval [path widths]: +/- 0.13 * 1 sigma uncertainty interval [seconds]: +/- 0.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.013, +/- 0.001) * 1 sigma uncertainty ellipse (major, minor, PA): (0.013", 0.001", 95°) * approx speed of asteroid's shadow [km/s]: 28.7295 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 331-126197 by 1551 Argelander on 2024 Oct 12 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 -150 0 0 -12 3 21 20 13 5.4 1 114 67 -12 6 31 -12 0 11 -12 7 22 -11 59 21 .... -149 0 0 -12 30 14 20 13 5.5 2 114 68 -12 33 25 -12 27 4 -12 34 15 -12 26 14 0.28 -148 0 0 -12 57 11 20 13 5.7 3 114 68 -13 0 21 -12 54 1 -13 1 12 -12 53 10 0.28 -147 0 0 -13 24 10 20 13 5.9 4 114 69 -13 27 21 -13 21 0 -13 28 11 -13 20 9 0.28 -146 0 0 -13 51 12 20 13 6.2 5 113 70 -13 54 22 -13 48 1 -13 55 13 -13 47 11 0.28 -145 0 0 -14 18 14 20 13 6.6 6 113 71 -14 21 25 -14 15 4 -14 22 16 -14 14 13 0.28 -144 0 0 -14 45 18 20 13 7.1 7 113 72 -14 48 29 -14 42 7 -14 49 19 -14 41 16 0.28 -143 0 0 -15 12 21 20 13 7.7 8 113 72 -15 15 32 -15 9 10 -15 16 23 -15 8 20 0.28 -142 0 0 -15 39 24 20 13 8.3 9 112 73 -15 42 34 -15 36 13 -15 43 25 -15 35 22 0.28 -141 0 0 -16 6 25 20 13 9.1 10 112 74 -16 9 35 -16 3 14 -16 10 26 -16 2 23 0.28 -140 0 0 -16 33 23 20 13 9.9 11 112 74 -16 36 34 -16 30 13 -16 37 25 -16 29 22 0.28 -139 0 0 -17 0 19 20 13 10.7 12 111 75 -17 3 30 -16 57 8 -17 4 21 -16 56 18 0.28 -138 0 0 -17 27 11 20 13 11.7 13 111 75 -17 30 22 -17 24 1 -17 31 13 -17 23 10 0.28 -137 0 0 -17 53 59 20 13 12.7 14 111 76 -17 57 10 -17 50 49 -17 58 1 -17 49 58 0.28 -136 0 0 -18 20 42 20 13 13.8 16 111 76 -18 23 53 -18 17 31 -18 24 44 -18 16 41 0.28 -135 0 0 -18 47 19 20 13 15.0 17 110 76 -18 50 30 -18 44 9 -18 51 21 -18 43 18 0.28 -134 0 0 -19 13 50 20 13 16.2 18 110 77 -19 17 1 -19 10 39 -19 17 51 -19 9 49 0.28 -133 0 0 -19 40 14 20 13 17.5 19 109 77 -19 43 24 -19 37 3 -19 44 15 -19 36 12 0.28 -132 0 0 -20 6 30 20 13 18.9 20 109 77 -20 9 40 -20 3 19 -20 10 31 -20 2 29 0.28 -131 0 0 -20 32 37 20 13 20.3 21 109 77 -20 35 48 -20 29 27 -20 36 38 -20 28 36 0.28 -130 0 0 -20 58 36 20 13 21.9 22 108 76 -21 1 46 -20 55 26 -21 2 37 -20 54 35 0.28 -129 0 0 -21 24 25 20 13 23.4 23 108 76 -21 27 35 -21 21 15 -21 28 26 -21 20 24 0.28 -128 0 0 -21 50 4 20 13 25.1 24 107 76 -21 53 14 -21 46 54 -21 54 4 -21 46 3 0.28 -127 0 0 -22 15 32 20 13 26.8 25 107 76 -22 18 42 -22 12 22 -22 19 32 -22 11 31 0.28 -126 0 0 -22 40 48 20 13 28.5 26 107 75 -22 43 58 -22 37 39 -22 44 48 -22 36 48 0.28 -125 0 0 -23 5 53 20 13 30.3 27 106 75 -23 9 2 -23 2 43 -23 9 53 -23 1 53 0.28 -124 0 0 -23 30 45 20 13 32.2 28 106 74 -23 33 54 -23 27 36 -23 34 45 -23 26 45 0.28 -123 0 0 -23 55 24 20 13 34.1 29 105 74 -23 58 33 -23 52 15 -23 59 24 -23 51 25 0.28 -122 0 0 -24 19 50 20 13 36.1 30 105 73 -24 22 59 -24 16 41 -24 23 49 -24 15 51 0.28 -121 0 0 -24 44 1 20 13 38.2 31 104 72 -24 47 10 -24 40 53 -24 48 0 -24 40 2 0.28 -120 0 0 -25 7 58 20 13 40.2 32 104 72 -25 11 7 -25 4 50 -25 11 57 -25 4 0 0.28 -119 0 0 -25 31 40 20 13 42.4 33 103 71 -25 34 49 -25 28 32 -25 35 39 -25 27 42 0.28 -118 0 0 -25 55 7 20 13 44.6 34 103 70 -25 58 15 -25 51 59 -25 59 5 -25 51 9 0.28 -117 0 0 -26 18 18 20 13 46.8 35 102 69 -26 21 25 -26 15 10 -26 22 15 -26 14 20 0.28 -116 0 0 -26 41 12 20 13 49.1 36 101 69 -26 44 19 -26 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34 -25 58 38 0.29 18 0 0 -25 39 18 20 19 55.6 23 253 -43 -25 42 27 -25 36 10 -25 43 17 -25 35 20 0.29 19 0 0 -25 15 45 20 19 57.1 22 253 -44 -25 18 54 -25 12 37 -25 19 44 -25 11 47 0.29 20 0 0 -24 51 57 20 19 58.6 21 252 -45 -24 55 6 -24 48 48 -24 55 56 -24 47 58 0.29 21 0 0 -24 27 54 20 20 0.0 20 252 -46 -24 31 3 -24 24 45 -24 31 53 -24 23 55 0.29 22 0 0 -24 3 37 20 20 1.3 19 252 -47 -24 6 46 -24 0 28 -24 7 37 -23 59 38 0.29 23 0 0 -23 39 7 20 20 2.6 18 251 -48 -23 42 16 -23 35 58 -23 43 6 -23 35 7 0.29 24 0 0 -23 14 23 20 20 3.8 17 251 -49 -23 17 33 -23 11 14 -23 18 23 -23 10 23 0.30 25 0 0 -22 49 27 20 20 4.9 16 250 -50 -22 52 37 -22 46 18 -22 53 27 -22 45 27 0.30 26 0 0 -22 24 19 20 20 6.0 15 250 -51 -22 27 29 -22 21 9 -22 28 19 -22 20 19 0.30 27 0 0 -21 58 59 20 20 7.0 14 250 -52 -22 2 9 -21 55 49 -22 3 0 -21 54 59 0.30 28 0 0 -21 33 29 20 20 8.0 13 249 -53 -21 36 39 -21 30 19 -21 37 29 -21 29 28 0.30 29 0 0 -21 7 48 20 20 8.9 12 249 -54 -21 10 58 -21 4 38 -21 11 49 -21 3 47 0.30 30 0 0 -20 41 57 20 20 9.7 11 248 -55 -20 45 8 -20 38 47 -20 45 58 -20 37 57 0.31 31 0 0 -20 15 58 20 20 10.4 10 248 -55 -20 19 8 -20 12 47 -20 19 59 -20 11 57 0.31 32 0 0 -19 49 49 20 20 11.1 9 248 -56 -19 53 0 -19 46 39 -19 53 51 -19 45 48 0.31 33 0 0 -19 23 33 20 20 11.7 8 247 -57 -19 26 44 -19 20 23 -19 27 35 -19 19 32 0.32 34 0 0 -18 57 10 20 20 12.2 7 247 -58 -19 0 21 -18 54 0 -19 1 11 -18 53 9 0.32 35 0 0 -18 30 40 20 20 12.6 6 247 -59 -18 33 51 -18 27 30 -18 34 42 -18 26 39 0.33 36 0 0 -18 4 5 20 20 13.0 4 246 -60 -18 7 15 -18 0 54 -18 8 6 -18 0 3 0.35 37 0 0 -17 37 24 20 20 13.3 3 246 -61 -17 40 34 -17 34 13 -17 41 25 -17 33 22 0.37 38 0 0 -17 10 38 20 20 13.5 2 246 -62 -17 13 49 -17 7 28 -17 14 40 -17 6 37 0.41 39 0 0 -16 43 49 20 20 13.6 1 245 -63 -16 47 0 -16 40 38 -16 47 50 -16 39 47 0.51 40 0 0 -16 16 56 20 20 13.7 0 245 -63 -16 20 7 -16 13 46 -16 20 58 -16 12 55 1.53 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: UCAC4 331-126197 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 57 56.6917 DE: -23 50 36.905 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 57 56.6917 DE: -23 50 36.905 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.600,0.400) * V mag [mag]: 11.4 * B mag [mag]: 11.6 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1551) Argelander asteroid class: approx. diameter [km]: 10 approx. diameter ["]: 0.006 distance from Earth [AU]: 2.42280 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#52 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): 0.013", 0.000", 94.55° remarks: * orbital elements for (1551)Argelander : Mean anomaly = 318.9869837701 deg Arg. of pericenter = 232.8655379382 deg Long. of node = 107.2082131122 deg Inclination = 3.7604616224 deg Eccentricity = 0.0657135945 Semimajor axis = 2.3947674604 AU Perihelion dist = 2.2373986825 AU Mag: H = 12.18, G = 0.15 Epoch of elements : MJD 60595.84490141 TDT (2024 Oct 12.8449) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#522023Apr24,0.36,2024,10,12,20.277637,-0.011280,-0.262428,16.201568,-0.676979,0.005181,-0.000016,-0.000001,0.000000 -56.1971,-23.8470,-127.59,-7.82,False UCAC4 331-126197,17.96574775,-23.8435848,11.59,11.41,11.31,0.0,0,,17.99077981,-23.8470399,5.62,5.27,0,0,0 1551,Argelander,17.02,10.238,2.4228,0,0,4.287,-2.46,,0.8,0 0,318.7623,2024,10,12,232.8655,107.2082,3.7605,0.06571,2.39477,2.23740,12.18,5.0,0.15 1.133,0.0127,0.0006,95,0.0008,Known errors,2.00,0,-1,-1 20241012_126197,60140.63 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:06 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org