Comet C2014Q2 Lovejoy, Dated: 2014.12.20, UT: 17:59.22, 24:55N/75:34E, RBT,India
Tele: 0.2m/f6.3, Exp: 100x30secs, Filter: Clear, Atik383L+monoCCD
Image size: 46.3×34.9, Platescale: 1.66arcsec/pix
Imaged: Cepheids Astronomy Group.

38P/Stephan-Oterma, 2018-10-12T22:02:50.68 UT, Speed=1.53″/min, PA=70.7Deg, UCAC4, Mag=13.5 nucleus, +24:55:00N, 75:33:59E,
EXP: 420 secs,12.9µm/12.9µm, 19’X14′, ATIK-414exmono, R Bessell, 1.66″/pix, C11/f5.5/fl 1548.6mm/D280mm, OBJCRA 06 25 0.470, OBJCDEC= +14 10 46.28, CCDT= -4.9 DegC.
Astrometrica “ADES”, PRISMv10.
Cepheids Astronomy, RBT, INDIA.

46P/Wirtanen

Date=2018/11/28, 2146 IST
Phase: 46 °
Distance: 0.1308au
Solar distance: 1.0728au
Velocity: 37.0km/s
Hourly motion: 03’08.0″ PA:23° dRA:05.24s dDec:02’53.4″
Mean J2000: RA: 02h27m19.53s DE:-22°43’00.4″
Image center R.A.=02h:28m05s.28, DEC=-22°40’18.5″
Aperture:0.2m, FL=821mm + ASI1600
Start TimeStamp : 28-11-2018|21:46IST
End TimeStamp: 28-11-2018|22:08IST
Exposure: 50sec x 26 Luminence
Pixel scale:0.955 arcsec/pixel
Orientation:Up is 82.1 degrees E of N

Modeling :
Rotational Gradient (Delta: 1.4, Alpha: 92 deg)
Larson-Sekanina (Delta: 0.0, Alpha: 45 deg)

Cepheid Observatory, RBT, India
Vorion Scientific Observatory, AHD, India

Comet 46P/Wirtanen, 2018-12-23T14:25:07
0.28m+CCD, PRiSMV10
Imaged: Kuldip Vora, Measure: Vikrant Agnihotri
Cepheid Observatory, RBT, India
Vorion Scientific Observatory, AHD, India

Name : C/2018Y1(Iwamoto), 2019-02-24T16:30:45
C8/f5.9+CCD+Lband
Perihelion date : 2458521.5258 07-Feb-19 00:37:09
Eccentricity : 0.990037
Inclination (°): 160.4015
Node longitude (°): 147.4827
Argument (°): 358.053
perihelion distance (ua): 1.286948
Absolute Magnitude : 11.5
Activity Parameter : 4
Julian day : 2458539.24919919 -> 24-Feb-19 17:58:50
RA (2000) : 06h01m05.527s DEC (2000) : +35°09’44.27”
Sun elongation (°) : 114
Geocentric distance (ua) : 0.55045
Speed (arcsec/hour) :316.4
Angle (PA) : 271.45 °
Magnitude:13.4
RA speed : -386.9 arcsec/hour DEC : 7.9 arcsec/hour
Cepheid’s Observatory, RBT, India
Vorion Scientific Observatory, AHD, India

Comet 60P: size estimation (coma+tail)
DX= 208 DY= 373 pixels
Distance (Pixels) : 427.07
Point #1 : X1=142 Y1=47
11h36m32.750s -05°54’48.85”
Point #2 : X2=349 Y2=419
11h35m45.315s -05°48’48.02”
Distance into the SKY (Angle) : 00°13’14”= 0.2167 deg
1 deg = 3.14/180 radian
0.2167 deg = 0.00378 radian
Comet geocentric distance = 0.8437 au
Estimated length of comet (coma + tail) = 0.00378 x 0.8437 = 0.00319 au
Which mean = 477217 Km

Cepheid Observatory, RBT, India
Vorion Scientific Observatory, AHD, India

C/2017 E4 Lovejoy ‘2017-03-31T23:38:58’
Tele: C11/0.28m/f10.0, KAF8300 (3326X2504, 5.4µmX5.4µm)
Filter: Clear Filter
Binning: 3X3 (16.21µmX16.21µm)
Tele field of view: 22.10acrminx16.66acrmin
Plate scale: 1.1859 arcsec/pix
Image rotation: Up is 146 degrees E of N astrometry.net
Comet phase angle: 97 deg
Exp: 21X40secs
Guiding: PHD2/ZWO ASI120MM
OBJCTRA: 21 38 06
OBJCTDEC: +09 48 53
APT Tool, Maximdl, CCDstack, DS9
Cepheids Astronomy Group,RBT, India