P/2013 G4 (PANSTARRS)

Metadata

Parameter Value
Designation P/2013 G4 (PANSTARRS)
Type P
Perihelion (tp_cal, UTC) 2013-02-09T16:30:18.377280Z
Orbit solution date (soln_date, UTC) 2021-04-15T23:32:32Z
Obs used 41
NEO -
M1 15.100
K1 10.000
PC 0.030
Osculating Elements
Parameter Value
Epoch (epoch_cal, TDB) 2013-04-25.0000000
e 0.41041543
q (au) 2.613194
a (au) 4.432263
i (deg) 5.925606
Ω (om, deg) 339.772839
ω (w, deg) 214.390935
M (ma, deg) 7.849220

Magnitude

P/2013 G4 (PANSTARRS) · Magnitude (Full range)

Scatter + Global Linear

$$ M_a = (19.266 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$

Model Parameters

Parameter Value
H0 19.266
n 2.000
gf 1.000
gb -0.647
k 0.800
δ90 10.000
Parameter Symbol Range Description
Absolute magnitude at 1 AU from Sun and Earth H0 -5 to 20 Intrinsic brightness of the comet
Photometric slope parameter n 2 to 6 Rate of brightness change with heliocentric distance
Forward scattering asymmetry factor gf 0.8 to 1 Degree of forward scattering
Backward scattering asymmetry factor gb -1 to -0.5 Degree of backward scattering
Partitioning coefficient k 0.8 to 1 Ratio between forward/backward scattering contributions
Dust-to-gas brightness ratio δ90 1 to 10 Relative contribution of dust scattering to gas emission

Reference: EPSC-DPS2025-160

Ephemeris

Date/Time (UTC) RA (J2000) Dec (J2000) Nearest HIP Dist from HIP (arcmin)
2026-06-01 00:00 00:30:54.87 +05:32:11.3 HIP 2369 14.42
2026-06-01 12:00 00:31:07.51 +05:33:49.6 HIP 2369 17.81
2026-06-02 00:00 00:31:20.05 +05:35:27.3 HIP 2369 21.23
2026-06-02 12:00 00:31:32.50 +05:37:04.5 HIP 2477 20.27
2026-06-03 00:00 00:31:44.85 +05:38:41.1 HIP 2477 19.13
2026-06-03 12:00 00:31:57.11 +05:40:17.1 HIP 2477 18.57
2026-06-04 00:00 00:32:09.26 +05:41:52.6 HIP 2477 18.63
2026-06-04 12:00 00:32:21.32 +05:43:27.4 HIP 2477 19.30
2026-06-05 00:00 00:32:33.27 +05:45:01.8 HIP 2477 20.50
2026-06-05 12:00 00:32:45.13 +05:46:35.5 HIP 2477 22.13
2026-06-06 00:00 00:32:56.89 +05:48:08.6 HIP 2688 20.06
2026-06-06 12:00 00:33:08.54 +05:49:41.1 HIP 2688 16.77
2026-06-07 00:00 00:33:20.10 +05:51:13.1 HIP 2688 13.52
2026-06-07 12:00 00:33:31.55 +05:52:44.4 HIP 2688 10.29
2026-06-08 00:00 00:33:42.89 +05:54:15.1 HIP 2688 7.09
2026-06-08 12:00 00:33:54.14 +05:55:45.2 HIP 2688 3.92
2026-06-09 00:00 00:34:05.28 +05:57:14.7 HIP 2688 0.78
2026-06-09 12:00 00:34:16.31 +05:58:43.6 HIP 2688 2.36
2026-06-10 00:00 00:34:27.23 +06:00:11.9 HIP 2688 5.44
2026-06-10 12:00 00:34:38.05 +06:01:39.5 HIP 2688 8.50
2026-06-11 00:00 00:34:48.76 +06:03:06.5 HIP 2688 11.53
2026-06-11 12:00 00:34:59.37 +06:04:32.8 HIP 2688 14.54
2026-06-12 00:00 00:35:09.86 +06:05:58.5 HIP 2688 17.51
2026-06-12 12:00 00:35:20.24 +06:07:23.6 HIP 2831 16.68
2026-06-13 00:00 00:35:30.52 +06:08:48.0 HIP 2831 14.24
2026-06-13 12:00 00:35:40.68 +06:10:11.7 HIP 2831 12.05
2026-06-14 00:00 00:35:50.72 +06:11:34.8 HIP 2831 10.22
2026-06-14 12:00 00:36:00.66 +06:12:57.2 HIP 2831 8.94
2026-06-15 00:00 00:36:10.48 +06:14:19.0 HIP 2831 8.46
2026-06-15 12:00 00:36:20.19 +06:15:40.0 HIP 2831 8.86
2026-06-16 00:00 00:36:29.78 +06:17:00.4 HIP 2831 10.01
2026-06-16 12:00 00:36:39.26 +06:18:20.1 HIP 2831 11.68
2026-06-17 00:00 00:36:48.62 +06:19:39.1 HIP 2831 13.66
2026-06-17 12:00 00:36:57.86 +06:20:57.5 HIP 2831 15.81
2026-06-18 00:00 00:37:06.98 +06:22:15.1 HIP 2831 18.06
2026-06-18 12:00 00:37:15.99 +06:23:32.0 HIP 2831 20.37
2026-06-19 00:00 00:37:24.88 +06:24:48.2 HIP 2831 22.71
2026-06-19 12:00 00:37:33.64 +06:26:03.8 HIP 2831 25.05
2026-06-20 00:00 00:37:42.29 +06:27:18.6 HIP 2831 27.39
2026-06-20 12:00 00:37:50.82 +06:28:32.7 HIP 3033 29.30
2026-06-21 00:00 00:37:59.23 +06:29:46.1 HIP 3033 29.76
2026-06-21 12:00 00:38:07.51 +06:30:58.7 HIP 3033 30.40
2026-06-22 00:00 00:38:15.68 +06:32:10.7 HIP 3033 31.21