IOTA/IOTA-ES occultation update for (344) Desiderata / TYC 7410-02163-1 event on 2021 Apr 04, 08:08 UT Visible from South America Summary ------- On 2021 Apr 04 UT, the 128.4 km diameter asteroid (344) Desiderata will occult a 10.8 mag star in the constellation Sagittarius for observers along a path across South America. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.53 mag to 12.03 mag (the magnitude of the asteroid) for at most 5.2 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: 2021 Apr 04, 08:04 - 2021 Apr 04, 08:12 * geocentric midpoint of event [JD]: 2459308.83917500 * magnitude of target star: 10.81 * magnitude drop [mag]: 1.53 * estimated maximum duration [s]: 5.2 * Moon: 51 % sunlit, 6° distance * Sun: 90° distance * rough path description: South America The occultation path -------------------- * approximate projected width [km]: 136 * 1 sigma uncertainty interval [path widths]: +/- 0.11 * 1 sigma uncertainty interval [seconds]: +/- 2.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.052, +/- 0.008) * 1 sigma uncertainty ellipse (major, minor, PA): (0.052", 0.007", 94°) * approx speed of asteroid's shadow [km/s]: 24.6629 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 7410-02163-1 by 344 Desiderata on 2021 Apr 4 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 -118 0 0 - 3 8 59 8 4 21.3 0 122 -86 - 3 52 45 .. .. .. - 4 2 26 .. .. .. .... -117 0 0 - 3 46 30 8 4 21.4 2 122 -86 - 4 30 27 - 3 2 47 - 4 40 10 - 2 53 11 0.34 -116 0 0 - 4 24 32 8 4 21.6 3 121 -85 - 5 8 40 - 3 40 39 - 5 18 26 - 3 31 0 0.35 -115 0 0 - 5 3 4 8 4 21.9 4 121 -85 - 5 47 23 - 4 19 1 - 5 57 11 - 4 9 19 0.36 -114 0 0 - 5 42 5 8 4 22.4 5 121 -84 - 6 26 34 - 4 57 51 - 6 36 25 - 4 48 8 0.36 -113 0 0 - 6 21 34 8 4 23.0 6 121 -83 - 7 6 14 - 5 37 10 - 7 16 7 - 5 27 25 0.36 -112 0 0 - 7 1 30 8 4 23.6 7 121 -82 - 7 46 20 - 6 16 56 - 7 56 16 - 6 7 8 0.36 -111 0 0 - 7 41 52 8 4 24.5 9 121 -81 - 8 26 52 - 6 57 8 - 8 36 50 - 6 47 18 0.37 -110 0 0 - 8 22 39 8 4 25.4 10 121 -79 - 9 7 48 - 7 37 44 - 9 17 48 - 7 27 52 0.37 -109 0 0 - 9 3 48 8 4 26.4 11 121 -78 - 9 49 8 - 8 18 44 - 9 59 10 - 8 8 50 0.37 -108 0 0 - 9 45 20 8 4 27.6 12 120 -77 -10 30 49 - 9 0 7 -10 40 53 - 8 50 11 0.37 -107 0 0 -10 27 12 8 4 28.9 13 120 -76 -11 12 50 - 9 41 50 -11 22 56 - 9 31 52 0.37 -106 0 0 -11 9 23 8 4 30.3 15 120 -75 -11 55 10 -10 23 53 -12 5 18 -10 13 53 0.37 -105 0 0 -11 51 52 8 4 31.9 16 120 -74 -12 37 48 -11 6 13 -12 47 58 -10 56 11 0.37 -104 0 0 -12 34 38 8 4 33.5 17 119 -72 -13 20 41 -11 48 50 -13 30 53 -11 38 47 0.37 -103 0 0 -13 17 37 8 4 35.3 18 119 -71 -14 3 49 -12 31 42 -14 14 3 -12 21 37 0.37 -102 0 0 -14 0 50 8 4 37.2 20 119 -70 -14 47 9 -13 14 48 -14 57 25 -13 4 41 0.37 -101 0 0 -14 44 14 8 4 39.2 21 119 -69 -15 30 41 -13 58 5 -15 40 57 -13 47 57 0.37 -100 0 0 -15 27 48 8 4 41.3 22 118 -68 -16 14 21 -14 41 32 -16 24 40 -14 31 23 0.37 - 99 0 0 -16 11 30 8 4 43.6 23 118 -67 -16 58 9 -15 25 8 -17 8 29 -15 14 57 0.37 - 98 0 0 -16 55 18 8 4 45.9 24 118 -65 -17 42 3 -16 8 51 -17 52 24 -15 58 38 0.37 - 97 0 0 -17 39 11 8 4 48.3 26 117 -64 -18 26 1 -16 52 38 -18 36 23 -16 42 24 0.37 - 96 0 0 -18 23 6 8 4 50.9 27 117 -63 -19 10 1 -17 36 28 -19 20 24 -17 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44 -40 37 16 -39 8 8 -40 47 10 -38 58 22 0.39 67 0 0 -39 21 13 8 12 17.8 15 242 44 -40 6 5 -38 36 37 -40 16 0 -38 26 49 0.39 68 0 0 -38 49 17 8 12 19.0 15 241 44 -39 34 18 -38 4 31 -39 44 15 -37 54 40 0.39 69 0 0 -38 16 45 8 12 20.1 14 240 45 -39 1 55 -37 31 50 -39 11 55 -37 21 57 0.39 70 0 0 -37 43 39 8 12 21.2 13 240 45 -38 28 58 -36 58 35 -38 39 0 -36 48 40 0.40 71 0 0 -37 9 58 8 12 22.2 12 239 45 -37 55 26 -36 24 45 -38 5 30 -36 14 49 0.40 72 0 0 -36 35 44 8 12 23.1 11 239 46 -37 21 20 -35 50 23 -37 31 26 -35 40 25 0.40 73 0 0 -36 0 56 8 12 24.0 10 238 46 -36 46 41 -35 15 27 -36 56 48 -35 5 27 0.41 74 0 0 -35 25 35 8 12 24.7 9 237 46 -36 11 28 -34 39 59 -36 21 38 -34 29 57 0.41 75 0 0 -34 49 43 8 12 25.4 8 237 46 -35 35 43 -34 3 58 -35 45 54 -33 53 56 0.42 76 0 0 -34 13 18 8 12 26.1 7 236 46 -34 59 26 -33 27 27 -35 9 38 -33 17 23 0.43 77 0 0 -33 36 23 8 12 26.6 6 236 47 -34 22 38 -32 50 26 -34 32 52 -32 40 20 0.44 78 0 0 -32 58 59 8 12 27.1 5 235 47 -33 45 19 -32 12 55 -33 55 34 -32 2 48 0.45 79 0 0 -32 21 5 8 12 27.4 3 235 47 -33 7 31 -31 34 55 -33 17 48 -31 24 47 0.48 80 0 0 -31 42 43 8 12 27.7 2 234 47 -32 29 14 -30 56 28 -32 39 32 -30 46 18 0.53 81 0 0 -31 3 53 8 12 27.9 1 233 47 -31 50 30 -30 17 34 -32 0 49 -30 7 23 0.66 82 0 0 -30 24 38 8 12 28.0 0 233 47 -31 11 19 .. .. .. -31 21 39 .. .. .. 1.79 Uncertainty in time = +/- 2 secs Prediction of 2021 Mar 17.0 Data for the target star ------------------------ * name: TYC 7410-02163-1 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 19 08 22.5040 DE: -31 34 09.788 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 19 08 22.5041 DE: -31 34 09.788 * position source: Gaia EDR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 10.8 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (344) Desiderata asteroid class: approx. diameter [km]: 128 approx. diameter ["]: 0.113 distance from Earth [AU]: 1.56260 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#96 date of fit: 2021 Mar 16 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): 0.052", 0.007", 94.381° remarks: * orbital elements for (344)Desiderata : Mean anomaly = 343.27984735 deg Arg. of pericenter = 237.62251755 deg Long. of node = 48.02163481 deg Inclination = 18.34636724 deg Eccentricity = 0.31379947 Semimajor axis = 2.59627011 AU Perihelion dist = 1.78156193 AU Mag: H = 8.35, G = 0.15 Epoch of elements : MJD 59308.33923611 TDT (2021 Apr 04.3392) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#962021Mar16,5.21,2021,4,4,8.1402,-0.09435,-0.32388,13.36251,-3.90143,-0.00504,-0.00062,0.00000,0.00000 -27.5372,-31.5348,58.64,5.82,False TYC 7410-02163-1,19.13958442,-31.5693856,0.00,10.81,0.00,0.0,0,,19.16200170,-31.5347504 344,Desiderata,12.03,128.4,1.5626,0,0,5.884,-21.96,,6.2 0,343.1999,2021,4,4,237.6225,48.0216,18.3464,0.31380,2.59627,1.78156,8.35,5.0,0.15 1.110,0.0517,0.0067,94,0.0125,Known errors,-1.00,-1,-1,-1 20210404_2163-1,59290.00 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2021 Mar 17, 03:34 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org