| Parameter |
Value |
| Designation |
82P/Gehrels 3 |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2001-08-30T06:54:50.483520Z |
| Orbit solution date (soln_date, UTC) |
2021-03-19T14:50:48Z |
| Obs used |
143 |
| NEO |
- |
| M1 |
7.600 |
| K1 |
18.500 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2002-07-29.0000000 |
| e |
0.12325421 |
| q (au) |
3.625705 |
| a (au) |
4.135412 |
| i (deg) |
1.126555 |
| Ω (om, deg) |
239.591461 |
| ω (w, deg) |
227.495662 |
| M (ma, deg) |
38.993681 |
Magnitude
Scatter + Global Linear
$$
M_a = (15.339 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
15.339 |
| n |
2.000 |
| gf |
0.923 |
| gb |
-0.934 |
| k |
1.000 |
| δ90 |
7.611 |
| 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) |
| 2026-09-20 00:00 |
07:33:03.75 |
+21:04:16.4 |
HIP 36789 |
13.57 |
| 2026-09-20 12:00 |
07:33:33.67 |
+21:03:01.8 |
HIP 36789 |
7.62 |
| 2026-09-21 00:00 |
07:34:03.43 |
+21:01:47.1 |
HIP 36789 |
5.69 |
| 2026-09-21 12:00 |
07:34:33.05 |
+21:00:32.4 |
HIP 36789 |
10.28 |
| 2026-09-22 00:00 |
07:35:02.51 |
+20:59:17.6 |
HIP 36789 |
16.63 |
| 2026-09-22 12:00 |
07:35:31.82 |
+20:58:02.8 |
HIP 36789 |
23.32 |
| 2026-09-23 00:00 |
07:36:00.98 |
+20:56:48.0 |
HIP 37067 |
19.41 |
| 2026-09-23 12:00 |
07:36:29.99 |
+20:55:33.1 |
HIP 37067 |
16.18 |
| 2026-09-24 00:00 |
07:36:58.84 |
+20:54:18.3 |
HIP 37067 |
15.54 |
| 2026-09-24 12:00 |
07:37:27.54 |
+20:53:03.4 |
HIP 37067 |
17.73 |
| 2026-09-25 00:00 |
07:37:56.08 |
+20:51:48.5 |
HIP 37298 |
21.42 |
| 2026-09-25 12:00 |
07:38:24.46 |
+20:50:33.7 |
HIP 37298 |
14.75 |
| 2026-09-26 00:00 |
07:38:52.69 |
+20:49:18.9 |
HIP 37298 |
8.23 |
| 2026-09-26 12:00 |
07:39:20.75 |
+20:48:04.0 |
HIP 37298 |
2.86 |
| 2026-09-27 00:00 |
07:39:48.66 |
+20:46:49.3 |
HIP 37298 |
6.11 |
| 2026-09-27 12:00 |
07:40:16.40 |
+20:45:34.5 |
HIP 37298 |
12.40 |
| 2026-09-28 00:00 |
07:40:43.98 |
+20:44:19.9 |
HIP 37298 |
18.87 |
| 2026-09-28 12:00 |
07:41:11.39 |
+20:43:05.2 |
HIP 37438 |
17.36 |
| 2026-09-29 00:00 |
07:41:38.64 |
+20:41:50.7 |
HIP 37438 |
17.58 |
| 2026-09-29 12:00 |
07:42:05.72 |
+20:40:36.2 |
HIP 37540 |
18.13 |
| 2026-09-30 00:00 |
07:42:32.64 |
+20:39:21.8 |
HIP 37540 |
19.64 |
| 2026-09-30 12:00 |
07:42:59.38 |
+20:38:07.5 |
HIP 37540 |
22.90 |
| 2026-10-01 00:00 |
07:43:25.96 |
+20:36:53.3 |
HIP 37722 |
27.21 |
| 2026-10-01 12:00 |
07:43:52.36 |
+20:35:39.1 |
HIP 37820 |
23.24 |
| 2026-10-02 00:00 |
07:44:18.59 |
+20:34:25.2 |
HIP 37820 |
17.53 |
| 2026-10-02 12:00 |
07:44:44.65 |
+20:33:11.3 |
HIP 37820 |
12.39 |
| 2026-10-03 00:00 |
07:45:10.53 |
+20:31:57.5 |
HIP 37820 |
8.79 |
| 2026-10-03 12:00 |
07:45:36.23 |
+20:30:43.9 |
HIP 37820 |
8.79 |
| 2026-10-04 00:00 |
07:46:01.76 |
+20:29:30.5 |
HIP 37820 |
12.32 |
| 2026-10-04 12:00 |
07:46:27.10 |
+20:28:17.2 |
HIP 37820 |
17.31 |
| 2026-10-05 00:00 |
07:46:52.26 |
+20:27:04.1 |
HIP 38082 |
20.09 |
| 2026-10-05 12:00 |
07:47:17.24 |
+20:25:51.2 |
HIP 38082 |
14.12 |
| 2026-10-06 00:00 |
07:47:42.03 |
+20:24:38.4 |
HIP 38082 |
8.20 |
| 2026-10-06 12:00 |
07:48:06.64 |
+20:23:25.9 |
HIP 38082 |
2.39 |
| 2026-10-07 00:00 |
07:48:31.06 |
+20:22:13.5 |
HIP 38082 |
3.65 |
| 2026-10-07 12:00 |
07:48:55.29 |
+20:21:01.4 |
HIP 38082 |
9.41 |
| 2026-10-08 00:00 |
07:49:19.33 |
+20:19:49.5 |
HIP 38082 |
15.16 |
| 2026-10-08 12:00 |
07:49:43.18 |
+20:18:37.8 |
HIP 38308 |
18.45 |
| 2026-10-09 00:00 |
07:50:06.83 |
+20:17:26.4 |
HIP 38308 |
14.16 |
| 2026-10-09 12:00 |
07:50:30.29 |
+20:16:15.3 |
HIP 38308 |
11.19 |
| 2026-10-10 00:00 |
07:50:53.56 |
+20:15:04.4 |
HIP 38308 |
10.63 |
| 2026-10-10 12:00 |
07:51:16.62 |
+20:13:53.7 |
HIP 38308 |
12.76 |
| 2026-10-11 00:00 |
07:51:39.49 |
+20:12:43.4 |
HIP 38308 |
16.51 |