| Parameter |
Value |
| Designation |
P/2016 G1 (PANSTARRS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2017-01-26T04:39:52.557120Z |
| Orbit solution date (soln_date, UTC) |
2021-08-06T00:42:46Z |
| Obs used |
147 |
| NEO |
- |
| M1 |
16.100 |
| K1 |
4.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2016-04-30.0000000 |
| e |
0.21010208 |
| q (au) |
2.040494 |
| a (au) |
2.583238 |
| i (deg) |
10.967835 |
| Ω (om, deg) |
204.074723 |
| ω (w, deg) |
111.280022 |
| M (ma, deg) |
295.621914 |
Magnitude
Scatter + Global Linear
$$
M_a = (15.642 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
15.642 |
| n |
2.000 |
| gf |
0.800 |
| gb |
-0.903 |
| k |
0.999 |
| δ90 |
1.000 |
| 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
Finding Chart
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-03-26 00:00 |
02:36:34.34 |
+10:53:59.0 |
HIP 12194 |
11.79 |
| 2026-03-26 12:00 |
02:37:24.83 |
+10:57:19.7 |
HIP 12194 |
8.31 |
| 2026-03-27 00:00 |
02:38:15.34 |
+11:00:39.7 |
HIP 12194 |
18.13 |
| 2026-03-27 12:00 |
02:39:05.89 |
+11:03:59.1 |
HIP 12354 |
25.76 |
| 2026-03-28 00:00 |
02:39:56.47 |
+11:07:17.9 |
HIP 12354 |
31.85 |
| 2026-03-28 12:00 |
02:40:47.09 |
+11:10:36.0 |
HIP 12647 |
36.14 |
| 2026-03-29 00:00 |
02:41:37.73 |
+11:13:53.6 |
HIP 12647 |
31.96 |
| 2026-03-29 12:00 |
02:42:28.41 |
+11:17:10.4 |
HIP 12647 |
32.67 |
| 2026-03-30 00:00 |
02:43:19.11 |
+11:20:26.7 |
HIP 12787 |
27.39 |
| 2026-03-30 12:00 |
02:44:09.85 |
+11:23:42.2 |
HIP 12787 |
26.16 |
| 2026-03-31 00:00 |
02:45:00.62 |
+11:26:57.1 |
HIP 12929 |
27.11 |
| 2026-03-31 12:00 |
02:45:51.42 |
+11:30:11.4 |
HIP 12929 |
17.52 |
| 2026-04-01 00:00 |
02:46:42.24 |
+11:33:25.0 |
HIP 12929 |
14.50 |
| 2026-04-01 12:00 |
02:47:33.10 |
+11:36:37.8 |
HIP 12929 |
21.08 |
| 2026-04-02 00:00 |
02:48:23.98 |
+11:39:50.0 |
HIP 13228 |
28.14 |
| 2026-04-02 12:00 |
02:49:14.90 |
+11:43:01.5 |
HIP 13228 |
16.69 |
| 2026-04-03 00:00 |
02:50:05.84 |
+11:46:12.3 |
HIP 13246 |
8.47 |
| 2026-04-03 12:00 |
02:50:56.82 |
+11:49:22.4 |
HIP 13246 |
7.11 |
| 2026-04-04 00:00 |
02:51:47.82 |
+11:52:31.8 |
HIP 13246 |
19.00 |
| 2026-04-04 12:00 |
02:52:38.84 |
+11:55:40.5 |
HIP 13461 |
10.83 |
| 2026-04-05 00:00 |
02:53:29.90 |
+11:58:48.4 |
HIP 13461 |
3.06 |
| 2026-04-05 12:00 |
02:54:20.99 |
+12:01:55.6 |
HIP 13461 |
15.26 |
| 2026-04-06 00:00 |
02:55:12.10 |
+12:05:02.1 |
HIP 13669 |
21.93 |
| 2026-04-06 12:00 |
02:56:03.24 |
+12:08:07.9 |
HIP 13669 |
15.10 |
| 2026-04-07 00:00 |
02:56:54.40 |
+12:11:12.8 |
HIP 13669 |
17.52 |
| 2026-04-07 12:00 |
02:57:45.60 |
+12:14:17.1 |
HIP 13669 |
26.79 |
| 2026-04-08 00:00 |
02:58:36.82 |
+12:17:20.6 |
HIP 13921 |
20.21 |
| 2026-04-08 12:00 |
02:59:28.07 |
+12:20:23.3 |
HIP 13921 |
20.30 |
| 2026-04-09 00:00 |
03:00:19.34 |
+12:23:25.2 |
HIP 13966 |
25.74 |
| 2026-04-09 12:00 |
03:01:10.64 |
+12:26:26.4 |
HIP 14175 |
23.96 |
| 2026-04-10 00:00 |
03:02:01.96 |
+12:29:26.8 |
HIP 14175 |
13.61 |
| 2026-04-10 12:00 |
03:02:53.31 |
+12:32:26.3 |
HIP 14175 |
11.32 |
| 2026-04-11 00:00 |
03:03:44.69 |
+12:35:25.1 |
HIP 14343 |
18.33 |
| 2026-04-11 12:00 |
03:04:36.09 |
+12:38:23.1 |
HIP 14343 |
5.45 |
| 2026-04-12 00:00 |
03:05:27.51 |
+12:41:20.3 |
HIP 14343 |
7.44 |
| 2026-04-12 12:00 |
03:06:18.96 |
+12:44:16.7 |
HIP 14343 |
20.33 |
| 2026-04-13 00:00 |
03:07:10.44 |
+12:47:12.2 |
HIP 14439 |
26.60 |
| 2026-04-13 12:00 |
03:08:01.93 |
+12:50:06.9 |
HIP 14631 |
14.46 |
| 2026-04-14 00:00 |
03:08:53.45 |
+12:53:00.8 |
HIP 14631 |
2.32 |
| 2026-04-14 12:00 |
03:09:45.00 |
+12:55:53.9 |
HIP 14711 |
6.11 |
| 2026-04-15 00:00 |
03:10:36.56 |
+12:58:46.1 |
HIP 14711 |
7.96 |
| 2026-04-15 12:00 |
03:11:28.15 |
+13:01:37.4 |
HIP 14821 |
1.96 |
| 2026-04-16 00:00 |
03:12:19.76 |
+13:04:27.9 |
HIP 14821 |
14.17 |