IOTA/IOTA-ES occultation update for (1021) Flammario / UCAC4-581-037643 event on 2023 Apr 28, 00:50 UT Visible from SE USA Summary ------- On 2023 Apr 28 UT, the 104 km diameter asteroid (1021) Flammario will occult a 12.3 mag star in the constellation Gemini for observers along a path across SE USA. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.11 mag to 14.28 mag (the magnitude of the asteroid) for at most 3.650 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: 2023 Apr 28, 00:46 - 2023 Apr 28, 00:54 * geocentric midpoint of event [JD]: 2460062.53517338 * magnitude of target star: 12.34 * magnitude drop [mag]: 2.11 * estimated maximum duration [s]: 3.650 * Moon: 51 % sunlit, 20° distance * Sun: 70° distance * rough path description: SE USA The occultation path -------------------- * approximate projected width [km]: 105 * 1 sigma uncertainty interval [path widths]: +/- 0.08 * 1 sigma uncertainty interval [seconds]: +/- 1.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.018, +/- 0.004) * 1 sigma uncertainty ellipse (major, minor, PA): (0.018", 0.003", 82°) * approx speed of asteroid's shadow [km/s]: 28.5147 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4-581-037643 by 1021 Flammario on 2023 Apr 28 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 149 0 0 7 32 38 0 46 57.4 0 64 71 .. .. .. 8 4 27 .. .. .. 8 9 22 .... 150 0 0 8 2 13 0 46 57.5 1 64 72 7 30 26 8 34 2 7 25 32 8 38 58 -0.20 151 0 0 8 31 48 0 46 57.6 2 64 73 8 0 1 9 3 37 7 55 6 9 8 33 -0.17 152 0 0 9 1 21 0 46 57.9 4 64 74 8 29 34 9 33 10 8 24 39 9 38 6 -0.16 153 0 0 9 30 52 0 46 58.2 5 64 75 8 59 5 10 2 41 8 54 10 10 7 37 -0.16 154 0 0 10 0 20 0 46 58.6 6 64 76 9 28 33 10 32 9 9 23 38 10 37 5 -0.16 155 0 0 10 29 44 0 46 59.0 7 65 77 9 57 57 11 1 33 9 53 3 11 6 28 -0.15 156 0 0 10 59 3 0 46 59.6 8 65 78 10 27 17 11 30 51 10 22 23 11 35 47 -0.15 157 0 0 11 28 17 0 47 0.2 9 65 79 10 56 32 12 0 5 10 51 37 12 5 0 -0.15 158 0 0 11 57 25 0 47 0.9 10 65 80 11 25 40 12 29 12 11 20 46 12 34 7 -0.15 159 0 0 12 26 25 0 47 1.7 11 65 81 11 54 42 12 58 11 11 49 48 13 3 7 -0.15 160 0 0 12 55 18 0 47 2.6 12 66 82 12 23 36 13 27 3 12 18 42 13 31 58 -0.15 161 0 0 13 24 3 0 47 3.6 13 66 83 12 52 22 13 55 46 12 47 28 14 0 41 -0.15 162 0 0 13 52 38 0 47 4.6 14 66 84 13 20 58 14 24 20 13 16 5 14 29 15 -0.15 163 0 0 14 21 3 0 47 5.7 16 66 85 13 49 25 14 52 44 13 44 32 14 57 38 -0.15 164 0 0 14 49 18 0 47 6.9 17 67 86 14 17 41 15 20 57 14 12 48 15 25 51 -0.15 165 0 0 15 17 21 0 47 8.2 18 67 87 14 45 46 15 48 58 14 40 53 15 53 52 -0.15 166 0 0 15 45 12 0 47 9.5 19 67 87 15 13 39 16 16 48 15 8 47 16 21 41 -0.15 167 0 0 16 12 50 0 47 10.9 20 68 87 15 41 20 16 44 24 15 36 27 16 49 17 -0.15 168 0 0 16 40 15 0 47 12.3 21 68 87 16 8 47 17 11 47 16 3 55 17 16 40 -0.15 169 0 0 17 7 27 0 47 13.9 22 68 86 16 36 0 17 38 56 16 31 8 17 43 48 -0.15 170 0 0 17 34 23 0 47 15.5 23 69 86 17 2 59 18 5 50 16 58 8 18 10 42 -0.15 171 0 0 18 1 4 0 47 17.1 24 69 85 17 29 43 18 32 28 17 24 52 18 37 20 -0.15 172 0 0 18 27 30 0 47 18.9 25 69 84 17 56 11 18 58 51 17 51 20 19 3 43 -0.14 173 0 0 18 53 39 0 47 20.7 26 70 83 18 22 22 19 24 58 18 17 32 19 29 49 -0.14 174 0 0 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Uncertainty in time = +/- 1 secs Prediction of 2023 Mar 1.1 Data for the target star ------------------------ * name: UCAC4-581-037643 * constellation : Gemini * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 07 18 19.4406 DE: +26 05 37.081 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 07 18 19.4405 DE: +26 05 37.081 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 12.3 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1021) Flammario asteroid class: approx. diameter [km]: 104 approx. diameter ["]: 0.054 distance from Earth [AU]: 2.64760 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#67 date of fit: 2023 Feb 07 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): 0.018", 0.003", 81.823° remarks: * orbital elements for (1021)Flammario : Mean anomaly = 56.4985840364 deg Arg. of pericenter = 286.6216401559 deg Long. of node = 115.4148794652 deg Inclination = 15.8594926119 deg Eccentricity = 0.2843591650 Semimajor axis = 2.7380759915 AU Perihelion dist = 1.9594789889 AU Mag: H = 9.09, G = 0.15 Epoch of elements : MJD 60062.03520833 TDT (2023 Apr 28.0352) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#672023Feb07,3.65,2023,4,28,0.844161,0.000854,0.135090,16.093929,-0.134995,0.005192,-0.000587,-0.000001,0.000000 -118.4717,26.0527,166.74,14.01,False UCAC4-581-037643,7.30540019,26.0936335,0.00,12.34,0.00,0.0,0,,7.32898776,26.0527468,2.11,0.00,0,0,0 1021,Flammario,14.28,104.0,2.6476,0,0,3.967,-0.45,,5.2,0 0,56.2734,2023,4,27,286.6216,115.4149,15.8595,0.28436,2.73808,1.95948,9.11,5.0,0.15 1.077,0.0180,0.0032,82,0.0042,Known errors,-1.00,-1,-1,-1 20230428_037643,60004.06 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Mar 01, 01:21 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org