| 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) |
| 2026-05-12 00:00 |
04:41:32.47 |
+21:55:47.5 |
HIP 21856 |
26.03 |
| 2026-05-12 12:00 |
04:42:12.77 |
+21:56:59.3 |
HIP 21856 |
26.63 |
| 2026-05-13 00:00 |
04:42:53.11 |
+21:58:10.6 |
HIP 22042 |
27.99 |
| 2026-05-13 12:00 |
04:43:33.51 |
+21:59:21.3 |
HIP 22042 |
22.95 |
| 2026-05-14 00:00 |
04:44:13.95 |
+22:00:31.5 |
HIP 22042 |
21.17 |
| 2026-05-14 12:00 |
04:44:54.44 |
+22:01:41.1 |
HIP 22042 |
23.41 |
| 2026-05-15 00:00 |
04:45:34.98 |
+22:02:50.1 |
HIP 22222 |
24.17 |
| 2026-05-15 12:00 |
04:46:15.57 |
+22:03:58.5 |
HIP 22222 |
18.03 |
| 2026-05-16 00:00 |
04:46:56.20 |
+22:05:06.4 |
HIP 22222 |
15.67 |
| 2026-05-16 12:00 |
04:47:36.88 |
+22:06:13.7 |
HIP 22291 |
7.06 |
| 2026-05-17 00:00 |
04:48:17.60 |
+22:07:20.4 |
HIP 22291 |
4.59 |
| 2026-05-17 12:00 |
04:48:58.36 |
+22:08:26.5 |
HIP 22355 |
10.93 |
| 2026-05-18 00:00 |
04:49:39.17 |
+22:09:32.0 |
HIP 22443 |
12.65 |
| 2026-05-18 12:00 |
04:50:20.02 |
+22:10:36.9 |
HIP 22443 |
15.76 |
| 2026-05-19 00:00 |
04:51:00.92 |
+22:11:41.3 |
HIP 22443 |
22.77 |
| 2026-05-19 12:00 |
04:51:41.85 |
+22:12:45.0 |
HIP 22715 |
19.21 |
| 2026-05-20 00:00 |
04:52:22.82 |
+22:13:48.1 |
HIP 22715 |
9.68 |
| 2026-05-20 12:00 |
04:53:03.83 |
+22:14:50.6 |
HIP 22715 |
0.74 |
| 2026-05-21 00:00 |
04:53:44.88 |
+22:15:52.5 |
HIP 22715 |
9.47 |
| 2026-05-21 12:00 |
04:54:25.97 |
+22:16:53.8 |
HIP 22838 |
9.75 |
| 2026-05-22 00:00 |
04:55:07.09 |
+22:17:54.4 |
HIP 22838 |
9.99 |
| 2026-05-22 12:00 |
04:55:48.25 |
+22:18:54.5 |
HIP 22918 |
3.03 |
| 2026-05-23 00:00 |
04:56:29.44 |
+22:19:53.9 |
HIP 22918 |
8.72 |
| 2026-05-23 12:00 |
04:57:10.67 |
+22:20:52.6 |
HIP 22918 |
18.07 |
| 2026-05-24 00:00 |
04:57:51.93 |
+22:21:50.8 |
HIP 22935 |
27.47 |
| 2026-05-24 12:00 |
04:58:33.22 |
+22:22:48.3 |
HIP 23247 |
25.71 |
| 2026-05-25 00:00 |
04:59:14.55 |
+22:23:45.2 |
HIP 23247 |
17.40 |
| 2026-05-25 12:00 |
04:59:55.91 |
+22:24:41.4 |
HIP 23247 |
11.34 |
| 2026-05-26 00:00 |
05:00:37.30 |
+22:25:37.0 |
HIP 23284 |
11.36 |
| 2026-05-26 12:00 |
05:01:18.72 |
+22:26:32.0 |
HIP 23284 |
14.74 |
| 2026-05-27 00:00 |
05:02:00.17 |
+22:27:26.3 |
HIP 23284 |
22.15 |
| 2026-05-27 12:00 |
05:02:41.65 |
+22:28:20.0 |
HIP 23561 |
17.80 |
| 2026-05-28 00:00 |
05:03:23.16 |
+22:29:13.0 |
HIP 23561 |
8.32 |
| 2026-05-28 12:00 |
05:04:04.70 |
+22:30:05.4 |
HIP 23561 |
2.61 |
| 2026-05-29 00:00 |
05:04:46.26 |
+22:30:57.1 |
HIP 23561 |
11.41 |
| 2026-05-29 12:00 |
05:05:27.86 |
+22:31:48.1 |
HIP 23656 |
16.31 |
| 2026-05-30 00:00 |
05:06:09.48 |
+22:32:38.5 |
HIP 23784 |
7.53 |
| 2026-05-30 12:00 |
05:06:51.12 |
+22:33:28.3 |
HIP 23784 |
3.68 |
| 2026-05-31 00:00 |
05:07:32.79 |
+22:34:17.3 |
HIP 23784 |
12.52 |
| 2026-05-31 12:00 |
05:08:14.49 |
+22:35:05.8 |
HIP 23784 |
22.06 |
| 2026-06-01 00:00 |
05:08:56.21 |
+22:35:53.5 |
HIP 23784 |
31.67 |
| 2026-06-01 12:00 |
05:09:37.96 |
+22:36:40.6 |
HIP 24163 |
27.91 |
| 2026-06-02 00:00 |
05:10:19.72 |
+22:37:27.0 |
HIP 24163 |
20.99 |