IOTA/IOTA-ES occultation update for (72) Feronia / UCAC4 378-166365 event on 2022 Oct 31, 18:01 UT Visible from Africa Summary ------- On 2022 Oct 31 UT, the 80 km diameter asteroid (72) Feronia will occult a 11.5 mag star in the constellation Capricornus for observers along a path across Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.91 mag to 13.25 mag (the magnitude of the asteroid) for at most 3.540 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: 100 * date and approx. time of event: 2022 Oct 31, 17:56 - 2022 Oct 31, 18:05 * geocentric midpoint of event [JD]: 2459884.25085463 * magnitude of target star: 11.54 * magnitude drop [mag]: 1.91 * estimated maximum duration [s]: 3.540 * Moon: 44 % sunlit, 11° distance * Sun: 86° distance * rough path description: Africa The occultation path -------------------- * approximate projected width [km]: 86 * 1 sigma uncertainty interval [path widths]: +/- 0.04 * 1 sigma uncertainty interval [seconds]: +/- 0.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.013, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.013", 0.002", 81°) * approx speed of asteroid's shadow [km/s]: 22.5729 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 378-166365 by 72 Feronia on 2022 Oct 31 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 -101 0 0 -26 18 40 17 56 50.1 0 106 76 -26 42 55 -25 54 30 -26 44 44 -25 52 42 .... -100 0 0 -26 34 18 17 56 50.2 1 106 76 -26 58 32 -26 10 8 -27 0 21 -26 8 20 0.33 - 99 0 0 -26 49 48 17 56 50.3 2 105 76 -27 14 1 -26 25 39 -27 15 50 -26 23 51 0.35 - 98 0 0 -27 5 11 17 56 50.5 3 105 76 -27 29 23 -26 41 3 -27 31 12 -26 39 15 0.36 - 97 0 0 -27 20 26 17 56 50.8 4 104 76 -27 44 38 -26 56 18 -27 46 26 -26 54 30 0.37 - 96 0 0 -27 35 33 17 56 51.2 5 104 76 -27 59 44 -27 11 26 -28 1 32 -27 9 38 0.37 - 95 0 0 -27 50 31 17 56 51.7 6 103 76 -28 14 41 -27 26 25 -28 16 30 -27 24 37 0.37 - 94 0 0 -28 5 21 17 56 52.2 7 103 76 -28 29 30 -27 41 16 -28 31 18 -27 39 28 0.38 - 93 0 0 -28 20 2 17 56 52.8 8 102 76 -28 44 10 -27 55 57 -28 45 58 -27 54 10 0.38 - 92 0 0 -28 34 33 17 56 53.5 9 102 76 -28 58 40 -28 10 30 -29 0 29 -28 8 42 0.38 - 91 0 0 -28 48 55 17 56 54.3 9 101 75 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0.43 82 0 0 -15 49 17 18 5 36.5 6 256 -60 -16 13 29 -15 25 8 -16 15 18 -15 23 20 0.44 83 0 0 -15 33 1 18 5 36.9 5 256 -60 -15 57 12 -15 8 53 -15 59 1 -15 7 5 0.45 84 0 0 -15 16 51 18 5 37.3 4 256 -61 -15 41 2 -14 52 45 -15 42 50 -14 50 57 0.47 85 0 0 -15 0 49 18 5 37.6 3 256 -61 -15 24 59 -14 36 43 -15 26 47 -14 34 55 0.50 86 0 0 -14 44 54 18 5 37.8 2 255 -61 -15 9 3 -14 20 49 -15 10 51 -14 19 1 0.58 87 0 0 -14 29 6 18 5 37.9 1 255 -61 -14 53 14 -14 5 3 -14 55 3 -14 3 15 0.93 Uncertainty in time = +/- 1 secs Prediction of 2022 Oct 17.0 Data for the target star ------------------------ * name: UCAC4 378-166365 * constellation : Capricornus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 20 19 34.9951 DE: -14 34 03.358 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 20 19 34.9948 DE: -14 34 03.359 * position source: Gaia EDR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.5 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (72) Feronia asteroid class: approx. diameter [km]: 80 approx. diameter ["]: 0.061 distance from Earth [AU]: 1.82040 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#133 date of fit: 2022 Sep 21 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", 0.002", 81.471° remarks: * orbital elements for (72)Feronia : Mean anomaly = 17.3435677696 deg Arg. of pericenter = 103.1794536855 deg Long. of node = 207.9387217753 deg Inclination = 5.4166361068 deg Eccentricity = 0.1207473832 Semimajor axis = 2.2663769646 AU Perihelion dist = 1.9927178769 AU Mag: H = 9.15, G = 0.15 Epoch of elements : MJD 59883.75076389 TDT (2022 Oct 31.7508) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1332022Sep21,3.54,2022,10,31,18.020511,0.037696,-0.354096,12.667770,1.361833,0.005209,0.001273,0.000000,0.000000 -5.1143,-14.4966,-94.40,-14.27,False UCAC4 378-166365,20.32638748,-14.5675996,0.00,11.54,0.00,0.0,0,,20.34742647,-14.4965844,1.92,0.00,0,0,0 72,Feronia,13.25,80.0,1.8204,0,0,4.214,6.58,,4.0,0 0,17.1267,2022,10,31,103.1795,207.9387,5.4166,0.12075,2.26638,1.99272,9.15,5.0,0.15 1.037,0.0127,0.0022,81,0.0023,Known errors,-1.00,-1,-1,-1 20221031_166365,59868.96 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2022 Oct 16, 23:09 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org