IOTA/IOTA-ES occultation update for (702) Alauda / UCAC4 393-128168 event on 2024 Jul 08, 01:13 UT Visible from Summary ------- On 2024 Jul 08 UT, the 202.038 km diameter asteroid (702) Alauda will occult a 11.8 mag star in the constellation Aquarius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 0.95 mag to 12.14 mag (the magnitude of the asteroid) for at most 15.450 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 Jul 08, 01:06 - 2024 Jul 08, 01:20 * geocentric midpoint of event [JD]: 2460499.55109308 * magnitude of target star: 11.78 * magnitude drop [mag]: 0.95 * estimated maximum duration [s]: 15.450 * Moon: 5 % sunlit, 169° distance * Sun: 156° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 250 * 1 sigma uncertainty interval [path widths]: +/- 0.18 * 1 sigma uncertainty interval [seconds]: +/- 2.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.024, +/- 0.016) * 1 sigma uncertainty ellipse (major, minor, PA): (0.029", 0.002", 55°) * approx speed of asteroid's shadow [km/s]: 13.0756 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 393-128168 by 702 Alauda #1 on 2024 Jul 8 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 - 90 0 0 -19 2 24 1 20 8.1 0 102 -24 .. .. .. -20 12 5 .. .. .. -20 36 56 .... - 89 0 0 -19 14 51 1 20 8.0 1 102 -25 -18 6 6 -20 24 38 -17 42 5 -20 49 31 0.47 - 88 0 0 -19 27 40 1 20 7.7 2 101 -26 -18 18 50 -20 37 33 -17 54 47 -21 2 28 0.59 - 87 0 0 -19 40 51 1 20 7.3 3 101 -27 -18 31 55 -20 50 50 -18 7 50 -21 15 47 0.64 - 86 0 0 -19 54 24 1 20 6.7 4 101 -28 -18 45 23 -21 4 28 -18 21 16 -21 29 27 0.66 - 85 0 0 -20 8 18 1 20 5.9 5 100 -29 -18 59 11 -21 18 28 -18 35 2 -21 43 30 0.67 - 84 0 0 -20 22 33 1 20 4.9 6 100 -30 -19 13 20 -21 32 50 -18 49 9 -21 57 53 0.68 - 83 0 0 -20 37 9 1 20 3.8 7 100 -31 -19 27 50 -21 47 32 -19 3 37 -22 12 37 0.69 - 82 0 0 -20 52 5 1 20 2.5 8 99 -32 -19 42 40 -22 2 34 -19 18 25 -22 27 42 0.69 - 81 0 0 -21 7 21 1 20 1.1 9 99 -33 -19 57 50 -22 17 56 -19 33 32 -22 43 7 0.69 - 80 0 0 -21 22 57 1 19 59.4 10 99 -34 -20 13 19 -22 33 39 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Uncertainty in time = +/- 3 secs Prediction of 2023 Jul 15.2 Data for the target star ------------------------ * name: UCAC4 393-128168 * constellation : Aquarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 20 40 24.5741 DE: -11 30 58.766 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 20 40 24.5742 DE: -11 30 58.765 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.300,0.200) * V mag [mag]: 11.8 * B mag [mag]: 12.1 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (702) Alauda asteroid class: asteroid system: multiple bodies approx. diameter [km]: 202 approx. diameter ["]: 0.127 distance from Earth [AU]: 2.19120 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#117 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): 0.029", 0.002", 55.435° remarks: * orbital elements for (702)Alauda : Mean anomaly = 18.8378893701 deg Arg. of pericenter = 353.7230795650 deg Long. of node = 289.7111325289 deg Inclination = 20.6014108170 deg Eccentricity = 0.0158107016 Semimajor axis = 3.1936383828 AU Perihelion dist = 3.1431447192 AU Mag: H = 7.40, G = 0.15 Epoch of elements : MJD 60499.05109300 TDT (2024 Jul 08.0511) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1172023Apr24 Binary solution 1 : Kepler,15.45,2024,7,8,1.226234,-0.170955,-0.564229,-7.063954,2.137349,-0.002003,-0.001160,0.000001,0.000000 5.5592,-11.4290,162.89,22.43,False UCAC4 393-128168,20.67349279,-11.5163239,12.11,11.78,11.60,0.0,0,,20.69616593,-11.4289592,0.95,0.80,0,0,0 702,Alauda #1,12.14,202.038,2.1912,0,1,-1.928,8.58,,10.0,0 Pichi unem,3.5,1227,4.914000,0.0030,,,,, 0,18.6564,2024,7,7,353.7231,289.7111,20.6014,0.01581,3.19364,3.14314,7.40,5.0,0.15 1.176,0.0287,0.0016,55,0.0224,Known errors + binary orbit,1.57,0,-1,-1 20240708_128168_Ma1,60140.19 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 04:33 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org