IOTA/IOTA-ES occultation update for (418) Alemannia / G125258.8-143714 event on 2024 Feb 13, 06:49 UT Visible from Summary ------- On 2024 Feb 13 UT, the 39.3936978240755 km diameter asteroid (418) Alemannia will occult a 6.6 mag star in the constellation Corvus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 8.12 mag to 14.69 mag (the magnitude of the asteroid) for at most 15.160 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 13, 06:10 - 2024 Feb 13, 07:27 * geocentric midpoint of event [JD]: 2460353.78409880 * magnitude of target star: 6.57 * magnitude drop [mag]: 8.12 * estimated maximum duration [s]: 15.160 * Moon: 16 % sunlit, 169° distance * Sun: 125° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 42 * 1 sigma uncertainty interval [path widths]: +/- 0.31 * 1 sigma uncertainty interval [seconds]: +/- 4.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.010, +/- 0.005) * 1 sigma uncertainty ellipse (major, minor, PA): (0.010", 0.004", 110°) * approx speed of asteroid's shadow [km/s]: 2.7458 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of G125258.8-143714 by 418 Alemannia on 2024 Feb 13 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 -162 0 0 -36 46 16 7 27 0.2 0 108 -19 -36 34 16 -36 58 17 -36 26 55 -37 5 39 .... -161 0 0 -37 2 2 7 26 59.8 1 108 -19 -36 50 4 -37 14 1 -36 42 44 -37 21 22 0.19 -160 0 0 -37 17 20 7 26 58.8 2 107 -20 -37 5 23 -37 29 17 -36 58 4 -37 36 36 0.17 -159 0 0 -37 32 8 7 26 57.4 3 106 -20 -37 20 13 -37 44 3 -37 12 55 -37 51 22 0.17 -158 0 0 -37 46 28 7 26 55.5 4 106 -21 -37 34 35 -37 58 22 -37 27 18 -38 5 39 0.17 -157 0 0 -38 0 20 7 26 53.2 4 105 -21 -37 48 28 -38 12 12 -37 41 12 -38 19 29 0.17 -156 0 0 -38 13 44 7 26 50.3 5 105 -22 -38 1 54 -38 25 34 -37 54 39 -38 32 50 0.17 -155 0 0 -38 26 40 7 26 47.1 6 104 -22 -38 14 52 -38 38 29 -38 7 37 -38 45 44 0.17 -154 0 0 -38 39 10 7 26 43.4 7 103 -23 -38 27 22 -38 50 57 -38 20 9 -38 58 11 0.17 -153 0 0 -38 51 12 7 26 39.3 8 103 -23 -38 39 26 -39 2 58 -38 32 13 -39 10 11 0.17 -152 0 0 -39 2 47 7 26 34.7 8 102 -23 -38 51 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7 37 42 7 12 58 7 45 17 7 5 23 0.15 22 0 0 7 50 25 6 13 57.1 22 251 19 8 2 46 7 38 4 8 10 20 7 30 30 0.15 23 0 0 8 15 10 6 13 41.7 21 251 20 8 27 30 8 2 51 8 35 3 7 55 17 0.15 24 0 0 8 39 35 6 13 27.1 20 251 21 8 51 53 8 27 17 8 59 25 8 19 44 0.15 25 0 0 9 3 39 6 13 13.1 19 251 21 9 15 56 8 51 22 9 23 27 8 43 50 0.15 26 0 0 9 27 21 6 12 59.8 18 251 22 9 39 37 9 15 6 9 47 7 9 7 35 0.15 27 0 0 9 50 42 6 12 47.3 17 251 23 10 2 56 9 38 28 10 10 25 9 30 58 0.15 28 0 0 10 13 40 6 12 35.4 16 251 24 10 25 53 10 1 28 10 33 22 9 53 58 0.15 29 0 0 10 36 16 6 12 24.3 15 251 24 10 48 27 10 24 5 10 55 55 10 16 36 0.15 30 0 0 10 58 28 6 12 13.9 14 252 25 11 10 38 10 46 18 11 18 5 10 38 51 0.15 31 0 0 11 20 17 6 12 4.2 13 252 26 11 32 25 11 8 9 11 39 51 11 0 42 0.16 32 0 0 11 41 42 6 11 55.3 12 252 27 11 53 49 11 29 35 12 1 14 11 22 9 0.16 33 0 0 12 2 42 6 11 47.0 11 252 27 12 14 47 11 50 36 12 22 12 11 43 11 0.16 34 0 0 12 23 18 6 11 39.5 10 252 28 12 35 21 12 11 13 12 42 45 12 3 49 0.16 35 0 0 12 43 28 6 11 32.7 9 253 29 12 55 30 12 31 25 13 2 53 12 24 2 0.17 36 0 0 13 3 12 6 11 26.7 8 253 30 13 15 13 12 51 11 13 22 35 12 43 48 0.17 37 0 0 13 22 30 6 11 21.3 7 253 30 13 34 30 13 10 31 13 41 51 13 3 9 0.17 38 0 0 13 41 23 6 11 16.7 6 253 31 13 53 21 13 29 24 14 0 41 13 22 3 0.18 39 0 0 13 59 48 6 11 12.8 5 253 32 14 11 45 13 47 51 14 19 4 13 40 31 0.18 40 0 0 14 17 46 6 11 9.7 4 254 33 14 29 41 14 5 50 14 37 0 13 58 31 0.19 41 0 0 14 35 17 6 11 7.2 3 254 33 14 47 11 14 23 22 14 54 28 14 16 4 0.21 42 0 0 14 52 20 6 11 5.5 2 254 34 15 4 12 14 40 27 15 11 29 14 33 9 0.24 43 0 0 15 8 55 6 11 4.6 1 254 35 15 20 46 14 57 3 15 28 2 14 49 46 0.35 Uncertainty in time = +/- 6 secs Prediction of 2023 Jul 13.2 Data for the target star ------------------------ * name: G125258.8-143714 * constellation : Corvus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 12 52 58.7550 DE: -14 37 14.437 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 12 52 58.7551 DE: -14 37 14.438 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.300,0.200) * V mag [mag]: 6.6 * B mag [mag]: 7.9 * Diameter [mas]: 1.40 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (418) Alemannia asteroid class: approx. diameter [km]: 39 approx. diameter ["]: 0.025 distance from Earth [AU]: 2.20440 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#94 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): 0.010", 0.004", 109.645° remarks: * orbital elements for (418)Alemannia : Mean anomaly = 163.4043959682 deg Arg. of pericenter = 126.0409320224 deg Long. of node = 248.7194726222 deg Inclination = 6.8155155212 deg Eccentricity = 0.1186844512 Semimajor axis = 2.5932308500 AU Perihelion dist = 2.2854546698 AU Mag: H = 9.80, G = 0.15 Epoch of elements : MJD 60353.28409763 TDT (2024 Feb 13.2841) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#942023Apr24,15.16,2024,2,13,6.818371,0.087478,-0.172695,-1.382224,-0.701012,-0.004237,0.002346,0.000001,0.000000 -51.5263,-14.7521,81.28,-13.50,False G125258.8-143714,12.88298748,-14.6206769,7.90,6.57,5.85,1.4,4,,12.90424807,-14.7521074,1.38,7.90,1,0,1 418,Alemannia,14.69,41.632,2.2044,0,0,-0.381,-2.79,,2.2,0 0,163.3373,2024,2,13,126.0409,248.7195,6.8155,0.11868,2.59323,2.28545,9.80,5.0,0.15 1.307,0.0103,0.0040,110,0.0080,Known errors,1.03,0,-1,-1 20240213_143714,60138.17 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 13, 04:02 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org