IOTA/IOTA-ES occultation update for (891) Gunhild / UCAC4-578-035101 event on 2023 Feb 06, 06:09 UT Visible from W USA, South America Summary ------- On 2023 Feb 06 UT, the 59.4 km diameter asteroid (891) Gunhild will occult a 12.3 mag star in the constellation Gemini for observers along a path across W USA, South America. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.34 mag to 14.46 mag (the magnitude of the asteroid) for at most 6.910 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: 96 * date and approx. time of event: 2023 Feb 06, 05:56 - 2023 Feb 06, 06:21 * geocentric midpoint of event [JD]: 2459981.75615454 * magnitude of target star: 12.25 * magnitude drop [mag]: 2.34 * estimated maximum duration [s]: 6.910 * Moon: 100 % sunlit, 40° distance * Sun: 145° distance * rough path description: W USA, South America The occultation path -------------------- * approximate projected width [km]: 62 * 1 sigma uncertainty interval [path widths]: +/- 0.42 * 1 sigma uncertainty interval [seconds]: +/- 3.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.027, +/- 0.006) * 1 sigma uncertainty ellipse (major, minor, PA): (0.027", 0.004", 80°) * approx speed of asteroid's shadow [km/s]: 8.5935 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4-578-035101 by 891 Gunhild on 2023 Feb 6 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 119 0 0 39 59 18 6 20 45.6 0 56 28 40 19 17 39 39 22 40 36 6 .. .. .. .... 120 0 0 40 29 54 6 20 45.4 1 57 27 40 49 47 40 10 3 41 6 32 39 53 24 -0.30 121 0 0 40 59 48 6 20 45.0 2 58 26 41 19 35 40 40 2 41 36 15 40 23 27 -0.28 122 0 0 41 28 59 6 20 44.5 3 58 25 41 48 41 41 9 20 42 5 16 40 52 50 -0.27 123 0 0 41 57 30 6 20 43.7 4 59 24 42 17 6 41 37 55 42 33 36 41 21 30 -0.27 124 0 0 42 25 19 6 20 42.8 5 60 23 42 44 50 42 5 50 43 1 15 41 49 30 -0.27 125 0 0 42 52 28 6 20 41.8 6 60 23 43 11 53 42 33 4 43 28 14 42 16 48 -0.27 126 0 0 43 18 56 6 20 40.5 6 61 22 43 38 16 42 59 38 43 54 32 42 43 27 -0.27 127 0 0 43 44 45 6 20 39.2 7 62 21 44 3 59 43 25 33 44 20 11 43 9 26 -0.27 128 0 0 44 9 54 6 20 37.6 8 62 20 44 29 3 43 50 47 44 45 10 43 34 45 -0.27 129 0 0 44 34 25 6 20 36.0 9 63 19 44 53 28 44 15 23 45 9 31 43 59 25 -0.27 130 0 0 44 58 17 6 20 34.2 10 64 19 45 17 15 44 39 20 45 33 13 44 23 27 -0.27 131 0 0 45 21 31 6 20 32.3 11 64 18 45 40 24 45 2 40 45 56 17 44 46 50 -0.27 132 0 0 45 44 7 6 20 30.2 11 65 17 46 2 55 45 25 21 46 18 44 45 9 36 -0.27 133 0 0 46 6 7 6 20 28.1 12 66 16 46 24 50 45 47 26 46 40 35 45 31 45 -0.27 134 0 0 46 27 30 6 20 25.8 13 67 16 46 46 8 46 8 54 47 1 49 45 53 18 -0.27 135 0 0 46 48 17 6 20 23.4 14 67 15 47 6 50 46 29 46 47 22 27 46 14 14 -0.27 136 0 0 47 8 29 6 20 21.0 14 68 14 47 26 57 46 50 3 47 42 29 46 34 35 -0.27 137 0 0 47 28 6 6 20 18.4 15 69 13 47 46 29 47 9 44 48 1 57 46 54 20 -0.27 138 0 0 47 47 8 6 20 15.7 16 70 13 48 5 26 47 28 51 48 20 51 47 13 31 -0.27 139 0 0 48 5 36 6 20 12.9 17 70 12 48 23 50 47 47 24 48 39 11 47 32 8 -0.27 140 0 0 48 23 31 6 20 10.1 17 71 11 48 41 40 48 5 23 48 56 57 47 50 11 -0.27 141 0 0 48 40 53 6 20 7.1 18 72 11 48 58 58 48 22 49 49 14 11 48 7 40 -0.27 142 0 0 48 57 42 6 20 4.1 19 73 10 49 15 42 48 39 43 49 30 52 48 24 37 -0.27 143 0 0 49 13 59 6 20 1.0 19 73 9 49 31 55 48 56 4 49 47 1 48 41 2 -0.27 144 0 0 49 29 44 6 19 57.8 20 74 9 49 47 36 49 11 53 50 2 39 48 56 55 -0.27 145 0 0 49 44 58 6 19 54.6 21 75 8 50 2 47 49 27 12 50 17 46 49 12 16 -0.27 146 0 0 49 59 42 6 19 51.2 21 76 7 50 17 26 49 41 59 50 32 22 49 27 7 -0.27 147 0 0 50 13 55 6 19 47.8 22 76 7 50 31 35 49 56 16 50 46 28 49 41 27 -0.27 148 0 0 50 27 38 6 19 44.4 23 77 6 50 45 15 50 10 2 51 0 4 49 55 17 -0.27 149 0 0 50 40 51 6 19 40.8 23 78 5 50 58 25 50 23 20 51 13 11 50 8 37 -0.27 150 0 0 50 53 36 6 19 37.2 24 79 5 51 11 6 50 36 7 51 25 49 50 21 27 -0.27 151 0 0 51 5 52 6 19 33.6 25 80 4 51 23 18 50 48 26 51 37 59 50 33 49 -0.27 152 0 0 51 17 39 6 19 29.8 25 80 3 51 35 2 51 0 17 51 49 40 50 45 43 -0.27 153 0 0 51 28 58 6 19 26.1 26 81 3 51 46 18 51 11 40 52 0 54 50 57 8 -0.27 154 0 0 51 39 50 6 19 22.2 27 82 2 51 57 7 51 22 34 52 11 40 51 8 5 -0.27 155 0 0 51 50 14 6 19 18.3 27 83 2 52 7 29 51 33 2 52 21 59 51 18 35 -0.27 156 0 0 52 0 12 6 19 14.4 28 84 1 52 17 23 51 43 2 52 31 51 51 28 37 -0.27 157 0 0 52 9 43 6 19 10.4 29 84 0 52 26 51 51 52 35 52 41 17 51 38 13 -0.27 158 0 0 52 18 47 6 19 6.3 29 85 0 52 35 53 52 1 42 52 50 17 51 47 22 -0.27 159 0 0 52 27 26 6 19 2.2 30 86 -1 52 44 29 52 10 23 52 58 51 51 56 5 -0.27 160 0 0 52 35 38 6 18 58.1 30 87 -1 52 52 40 52 18 38 53 6 59 52 4 22 -0.27 161 0 0 52 43 25 6 18 53.8 31 88 -2 53 0 25 52 26 28 53 14 42 52 12 13 -0.27 162 0 0 52 50 47 6 18 49.6 32 89 -3 53 7 44 52 33 51 53 22 0 52 19 39 -0.27 163 0 0 52 57 44 6 18 45.3 32 89 -3 53 14 39 52 40 50 53 28 54 52 26 39 -0.27 164 0 0 53 4 16 6 18 40.9 33 90 -4 53 21 9 52 47 24 53 35 22 52 33 15 -0.27 165 0 0 53 10 23 6 18 36.5 33 91 -4 53 27 15 52 53 33 53 41 26 52 39 25 -0.28 166 0 0 53 16 7 6 18 32.0 34 92 -5 53 32 57 52 59 18 53 47 6 52 45 11 -0.28 167 0 0 53 21 25 6 18 27.5 35 93 -6 53 38 14 53 4 38 53 52 23 52 50 33 -0.28 168 0 0 53 26 20 6 18 23.0 35 94 -6 53 43 7 53 9 35 53 57 15 52 55 30 -0.28 169 0 0 53 30 51 6 18 18.4 36 95 -7 53 47 37 53 14 7 54 1 44 53 0 4 -0.28 170 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38 0 0 .. .. .... .. .. .. .. .. .. -12 6 27 .. .. .. -11 50 52 .. .. .. .... Uncertainty in time = +/- 5 secs Prediction of 2022 Dec 13.0 Data for the target star ------------------------ * name: UCAC4-578-035101 * constellation : Gemini * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 06 51 39.3810 DE: +25 28 43.403 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 06 51 39.3810 DE: +25 28 43.403 * 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: (891) Gunhild asteroid class: approx. diameter [km]: 59 approx. diameter ["]: 0.042 distance from Earth [AU]: 1.97320 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#103 date of fit: 2022 Nov 22 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): 0.027", 0.004", 80.306° remarks: * orbital elements for (891)Gunhild : Mean anomaly = 70.3195585846 deg Arg. of pericenter = 294.4314152801 deg Long. of node = 105.8073721523 deg Inclination = 13.5467821800 deg Eccentricity = 0.0263556358 Semimajor axis = 2.8594060739 AU Perihelion dist = 2.7840446087 AU Mag: H = 10.01, G = 0.15 Epoch of elements : MJD 59981.25625000 TDT (2023 Feb 06.2563) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1032022Nov22,6.91,2023,2,6,6.147709,0.132012,0.235033,-4.229662,2.374084,0.003368,-0.000529,0.000001,0.000000 -125.0681,25.4515,91.29,-15.69,False UCAC4-578-035101,6.86093918,25.4787230,0.00,12.25,0.00,0.0,0,,6.88482964,25.4514975,2.34,0.00,0,0,0 891,Gunhild,14.46,59.4,1.9732,0,0,-1.391,10.58,,2.8,0 0,70.2673,2023,2,6,294.4314,105.8074,13.5468,0.02636,2.85941,2.78404,10.01,5.0,0.15 1.420,0.0273,0.0037,80,0.0174,Known errors,-1.00,-1,-1,-1 20230206_035101,59926.02 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2022 Dec 13, 00:24 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org