P/2012 G1 (PANSTARRS)

Metadata

Parameter Value
Designation P/2012 G1 (PANSTARRS)
Type P
Perihelion (tp_cal, UTC) 2012-03-21T12:15:24.851520Z
Orbit solution date (soln_date, UTC) 2022-03-08T19:43:47Z
Obs used 22
NEO -
M1 14.700
K1 10.000
PC -
Osculating Elements
Parameter Value
Epoch (epoch_cal, TDB) 2012-04-16.0000000
e 0.32992923
q (au) 2.794694
a (au) 4.170744
i (deg) 12.171310
Ω (om, deg) 283.395321
ω (w, deg) 265.751864
M (ma, deg) 2.949454

Magnitude

P/2012 G1 (PANSTARRS) · Magnitude (Full range)

Scatter + Global Linear

$$ M_a = (16.018 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$

Model Parameters

Parameter Value
H0 16.018
n 2.000
gf 1.000
gb -0.500
k 1.000
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 02:52:00.21 +25:46:48.8 HIP 13433 20.16
2026-06-01 12:00 02:52:27.23 +25:48:43.8 HIP 13433 15.16
2026-06-02 00:00 02:52:54.22 +25:50:38.6 HIP 13433 11.60
2026-06-02 12:00 02:53:21.19 +25:52:33.4 HIP 13433 10.96
2026-06-03 00:00 02:53:48.13 +25:54:28.0 HIP 13433 13.66
2026-06-03 12:00 02:54:15.04 +25:56:22.5 HIP 13433 18.25
2026-06-04 00:00 02:54:41.93 +25:58:16.9 HIP 13672 19.94
2026-06-04 12:00 02:55:08.79 +26:00:11.2 HIP 13672 13.63
2026-06-05 00:00 02:55:35.61 +26:02:05.3 HIP 13672 7.36
2026-06-05 12:00 02:56:02.41 +26:03:59.4 HIP 13672 1.55
2026-06-06 00:00 02:56:29.18 +26:05:53.3 HIP 13672 5.50
2026-06-06 12:00 02:56:55.92 +26:07:47.0 HIP 13672 11.72
2026-06-07 00:00 02:57:22.62 +26:09:40.7 HIP 13672 17.98
2026-06-07 12:00 02:57:49.30 +26:11:34.2 HIP 13672 24.24
2026-06-08 00:00 02:58:15.94 +26:13:27.6 HIP 13672 30.50
2026-06-08 12:00 02:58:42.54 +26:15:20.8 HIP 13891 31.16
2026-06-09 00:00 02:59:09.11 +26:17:14.0 HIP 13891 29.43
2026-06-09 12:00 02:59:35.65 +26:19:06.9 HIP 13891 28.97
2026-06-10 00:00 03:00:02.15 +26:20:59.8 HIP 14109 25.97
2026-06-10 12:00 03:00:28.61 +26:22:52.4 HIP 14109 19.76
2026-06-11 00:00 03:00:55.04 +26:24:45.0 HIP 14109 13.57
2026-06-11 12:00 03:01:21.43 +26:26:37.4 HIP 14109 7.41
2026-06-12 00:00 03:01:47.78 +26:28:29.6 HIP 14109 1.61
2026-06-12 12:00 03:02:14.08 +26:30:21.7 HIP 14109 5.17
2026-06-13 00:00 03:02:40.35 +26:32:13.6 HIP 14150 5.42
2026-06-13 12:00 03:03:06.58 +26:34:05.3 HIP 14150 9.43
2026-06-14 00:00 03:03:32.76 +26:35:56.9 HIP 14150 14.96
2026-06-14 12:00 03:03:58.90 +26:37:48.3 HIP 14150 20.83
2026-06-15 00:00 03:04:25.00 +26:39:39.6 HIP 14150 26.80
2026-06-15 12:00 03:04:51.05 +26:41:30.7 HIP 14150 32.81
2026-06-16 00:00 03:05:17.05 +26:43:21.6 HIP 14150 38.84
2026-06-16 12:00 03:05:43.01 +26:45:12.3 HIP 14594 44.28
2026-06-17 00:00 03:06:08.92 +26:47:02.9 HIP 14594 40.85
2026-06-17 12:00 03:06:34.78 +26:48:53.3 HIP 14594 38.09
2026-06-18 00:00 03:07:00.59 +26:50:43.4 HIP 14594 36.16
2026-06-18 12:00 03:07:26.35 +26:52:33.4 HIP 14594 35.18
2026-06-19 00:00 03:07:52.06 +26:54:23.3 HIP 14748 34.56
2026-06-19 12:00 03:08:17.71 +26:56:12.9 HIP 14748 28.93
2026-06-20 00:00 03:08:43.32 +26:58:02.3 HIP 14748 23.51
2026-06-20 12:00 03:09:08.87 +26:59:51.6 HIP 14748 18.46
2026-06-21 00:00 03:09:34.37 +27:01:40.6 HIP 14748 14.16
2026-06-21 12:00 03:09:59.81 +27:03:29.5 HIP 14748 11.46
2026-06-22 00:00 03:10:25.20 +27:05:18.1 HIP 14748 11.54