IOTA/IOTA-ES occultation update for (112) Iphigenia / TYC 6182-00977-1 event on 2021 Feb 22, 23:05 UT Visible from S Africa Summary ------- On 2021 Feb 22 UT, the 72.6 km diameter asteroid (112) Iphigenia will occult a 11.1 mag star in the constellation Libra for observers along a path across S Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.62 mag to 14.67 mag (the magnitude of the asteroid) for at most 6.2 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Hugh Harris, astrometry for the asteroid kindly provided by Bill Owen, 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: 2021 Feb 22, 22:58 - 2021 Feb 22, 23:13 * geocentric midpoint of event [JD]: 2459268.46239583 * magnitude of target star: 11.09 * magnitude drop [mag]: 3.62 * estimated maximum duration [s]: 6.2 * Moon: 79 % sunlit, 134° distance * Sun: 101° distance * rough path description: S Africa The occultation path -------------------- * approximate projected width [km]: 93 * 1 sigma uncertainty interval [path widths]: +/- 0.18 * 1 sigma uncertainty interval [seconds]: +/- 1.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.014, +/- 0.009) * 1 sigma uncertainty ellipse (major, minor, PA): (0.014", 0.008", 105°) * approx speed of asteroid's shadow [km/s]: 11.6265 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6182-00977-1 by 112 Iphigenia on 2021 Feb 22 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 - 3 0 0 -15 57 59 22 58 42.4 1 112 -56 -16 25 40 -15 30 29 -16 35 44 -15 20 35 .... - 2 0 0 -16 22 35 22 58 42.8 2 112 -57 -16 50 25 -15 54 58 -17 0 31 -15 45 2 0.69 - 1 0 0 -16 47 50 22 58 43.4 3 111 -57 -17 15 47 -16 20 5 -17 25 56 -16 10 7 0.73 0 0 0 -17 13 43 22 58 44.2 4 111 -57 -17 41 48 -16 45 51 -17 52 0 -16 35 49 0.76 1 0 0 -17 40 14 22 58 45.2 5 111 -57 -18 8 27 -17 12 14 -18 18 42 -17 2 9 0.77 2 0 0 -18 7 22 22 58 46.5 6 110 -58 -18 35 43 -17 39 14 -18 46 1 -17 29 7 0.78 3 0 0 -18 35 8 22 58 48.1 7 110 -58 -19 3 37 -18 6 51 -19 13 58 -17 56 41 0.79 4 0 0 -19 3 30 22 58 49.9 8 110 -58 -19 32 8 -18 35 5 -19 42 32 -18 24 52 0.79 5 0 0 -19 32 28 22 58 51.9 9 109 -58 -20 1 15 -19 3 54 -20 11 42 -18 53 39 0.79 6 0 0 -20 2 2 22 58 54.2 10 109 -58 -20 30 57 -19 33 20 -20 41 28 -19 23 1 0.80 7 0 0 -20 32 11 22 58 56.7 12 109 -58 -21 1 15 -20 3 20 -21 11 49 -19 52 58 0.80 8 0 0 -21 2 55 22 58 59.4 13 108 -57 -21 32 8 -20 33 56 -21 42 45 -20 23 30 0.80 9 0 0 -21 34 13 22 59 2.4 14 108 -57 -22 3 35 -21 5 5 -22 14 16 -20 54 36 0.80 10 0 0 -22 6 4 22 59 5.7 15 107 -57 -22 35 36 -21 36 47 -22 46 19 -21 26 16 0.81 11 0 0 -22 38 28 22 59 9.2 16 107 -57 -23 8 9 -22 9 2 -23 18 56 -21 58 27 0.81 12 0 0 -23 11 24 22 59 12.9 17 106 -56 -23 41 14 -22 41 49 -23 52 5 -22 31 11 0.81 13 0 0 -23 44 51 22 59 16.9 18 106 -56 -24 14 51 -23 15 7 -24 25 45 -23 4 25 0.81 14 0 0 -24 18 49 22 59 21.1 19 105 -56 -24 48 58 -23 48 55 -24 59 55 -23 38 10 0.81 15 0 0 -24 53 15 22 59 25.6 20 105 -55 -25 23 34 -24 23 12 -25 34 34 -24 12 24 0.81 16 0 0 -25 28 10 22 59 30.2 21 104 -55 -25 58 38 -24 57 57 -26 9 42 -24 47 6 0.81 17 0 0 -26 3 32 22 59 35.2 22 104 -54 -26 34 9 -25 33 10 -26 45 17 -25 22 16 0.81 18 0 0 -26 39 20 22 59 40.3 23 103 -54 -27 10 7 -26 8 49 -27 21 18 -25 57 52 0.81 19 0 0 -27 15 33 22 59 45.7 24 103 -53 -27 46 30 -26 44 53 -27 57 44 -26 33 52 0.81 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15 0 0.85 -167 0 0 -61 37 20 23 12 42.1 12 248 38 -62 7 28 -61 7 28 -62 18 24 -60 56 44 0.85 -166 0 0 -61 18 48 23 12 43.5 11 247 39 -61 49 4 -60 48 46 -62 0 4 -60 37 59 0.85 -165 0 0 -60 59 46 23 12 44.9 11 246 39 -61 30 11 -60 29 36 -61 41 14 -60 18 45 0.85 -164 0 0 -60 40 14 23 12 46.3 10 245 39 -61 10 49 -60 9 55 -61 21 55 -59 59 2 0.86 -163 0 0 -60 20 13 23 12 47.5 10 244 40 -60 50 56 -59 49 46 -61 2 6 -59 38 49 0.86 -162 0 0 -59 59 42 23 12 48.8 9 243 40 -60 30 34 -59 29 6 -60 41 47 -59 18 6 0.86 -161 0 0 -59 38 40 23 12 50.0 9 242 40 -60 9 41 -59 7 56 -60 20 57 -58 56 53 0.87 -160 0 0 -59 17 8 23 12 51.1 8 241 40 -59 48 17 -58 46 15 -59 59 37 -58 35 9 0.87 -159 0 0 -58 55 4 23 12 52.1 7 240 41 -59 26 22 -58 24 3 -59 37 45 -58 12 55 0.88 -158 0 0 -58 32 30 23 12 53.1 7 240 41 -59 3 56 -58 1 20 -59 15 22 -57 50 9 0.89 -157 0 0 -58 9 24 23 12 54.0 6 239 41 -58 40 59 -57 38 7 -58 52 27 -57 26 52 0.90 -156 0 0 -57 45 47 23 12 54.8 5 238 42 -58 17 29 -57 14 22 -58 29 1 -57 3 5 0.91 -155 0 0 -57 21 38 23 12 55.5 5 237 42 -57 53 28 -56 50 5 -58 5 3 -56 38 45 0.92 -154 0 0 -56 56 57 23 12 56.2 4 236 42 -57 28 55 -56 25 17 -57 40 33 -56 13 55 0.94 -153 0 0 -56 31 45 23 12 56.7 3 235 42 -57 3 50 -55 59 57 -57 15 30 -55 48 33 0.97 -152 0 0 -56 6 1 23 12 57.2 3 234 43 -56 38 13 -55 34 6 -56 49 56 -55 22 39 1.01 -151 0 0 -55 39 45 23 12 57.6 2 234 43 -56 12 5 -55 7 44 -56 23 50 -54 56 14 1.09 -150 0 0 -55 12 58 23 12 57.8 1 233 43 -55 45 24 -54 40 50 -55 57 11 -54 29 18 1.27 -149 0 0 -54 45 39 23 12 58.0 0 232 43 -55 18 11 -54 13 25 -55 30 1 .. .. .. 2.09 Uncertainty in time = +/- 2 secs Prediction of 2020 Dec 31.0 Data for the target star ------------------------ * name: TYC 6182-00977-1 * constellation : Libra * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 15 18 47.2594 DE: -21 12 36.999 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 15 18 47.2596 DE: -21 12 37.000 * position source: Gaia EDR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 11.1 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (112) Iphigenia asteroid class: approx. diameter [km]: 73 approx. diameter ["]: 0.045 distance from Earth [AU]: 2.22460 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: Preston date of fit: 2020 Dec 31 source of used astrometry: MPC, FASTT, TMO number of used observations: 3415 number of rejected observations: 18 time covered by the observations: 1960 Mar 23 - 2020 Jun 29 1 sigma uncertainty ellipse (major, minor, PA): 0.014", 0.008", 104.8° remarks: * orbital elements for (112)Iphigenia : Mean anomaly = 242.26487953 deg Arg. of pericenter = 17.36142028 deg Long. of node = 323.40875385 deg Inclination = 2.59960763 deg Eccentricity = 0.12820528 Semimajor axis = 2.43315216 AU Perihelion dist = 2.12120921 AU Mag: H = 9.80, G = 0.15 Epoch of elements : MJD 59267.96200000 TDT (2021 Feb 22.9620) ------ occelmnt file for Occult BEGIN ----------------------------------- Preston2020Dec31,6.2,2021,2,22,23.0975,-0.23313,-0.57878,6.08620,-2.45405,-0.00548,0.00151,0.00000,0.00000 90.4701,-21.2856,-163.11,-9.84,False TYC 6182-00977-1,15.31312763,-21.2102776,0.00,11.09,0.00,0.0,0,,15.33329203,-21.2856298 112,Iphigenia,14.67,72.6,2.2246,0,0,1.722,-9.71,,3.8 0,242.0151,2021,2,22,17.3614,323.4088,2.5996,0.12821,2.43315,2.12121,9.80,5.0,0.15 1.181,0.0140,0.0080,105,0.0081,Known errors 20210222_0977-1,59214.00 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2020 Dec 31, 01:41 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org