| Parameter |
Value |
| Designation |
202P/Scotti |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2009-02-07T04:49:05.456640Z |
| Orbit solution date (soln_date, UTC) |
2025-03-06T13:42:30Z |
| Obs used |
449 |
| NEO |
- |
| M1 |
13.900 |
| K1 |
10.000 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2007-11-13.0000000 |
| e |
0.33043947 |
| q (au) |
2.526852 |
| a (au) |
3.773896 |
| i (deg) |
2.185340 |
| Ω (om, deg) |
194.588240 |
| ω (w, deg) |
255.594450 |
| M (ma, deg) |
299.207436 |
Magnitude
Scatter + Global Linear
$$
M_a = (16.098 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
16.098 |
| n |
2.000 |
| gf |
0.999 |
| gb |
-0.975 |
| 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) |
| 2026-05-12 00:00 |
13:11:20.06 |
-06:09:40.1 |
HIP 64147 |
38.77 |
| 2026-05-12 12:00 |
13:11:07.97 |
-06:08:24.0 |
HIP 64147 |
35.54 |
| 2026-05-13 00:00 |
13:10:56.06 |
-06:07:09.1 |
HIP 64147 |
32.37 |
| 2026-05-13 12:00 |
13:10:44.32 |
-06:05:55.3 |
HIP 64147 |
29.25 |
| 2026-05-14 00:00 |
13:10:32.78 |
-06:04:42.8 |
HIP 64147 |
26.20 |
| 2026-05-14 12:00 |
13:10:21.41 |
-06:03:31.4 |
HIP 64147 |
23.21 |
| 2026-05-15 00:00 |
13:10:10.23 |
-06:02:21.3 |
HIP 64147 |
20.29 |
| 2026-05-15 12:00 |
13:09:59.24 |
-06:01:12.4 |
HIP 64147 |
17.45 |
| 2026-05-16 00:00 |
13:09:48.44 |
-06:00:04.7 |
HIP 64147 |
14.70 |
| 2026-05-16 12:00 |
13:09:37.83 |
-05:58:58.3 |
HIP 64147 |
12.09 |
| 2026-05-17 00:00 |
13:09:27.41 |
-05:57:53.1 |
HIP 64147 |
9.65 |
| 2026-05-17 12:00 |
13:09:17.18 |
-05:56:49.2 |
HIP 64147 |
7.52 |
| 2026-05-18 00:00 |
13:09:07.16 |
-05:55:46.6 |
HIP 64147 |
5.95 |
| 2026-05-18 12:00 |
13:08:57.32 |
-05:54:45.2 |
HIP 64147 |
5.37 |
| 2026-05-19 00:00 |
13:08:47.69 |
-05:53:45.1 |
HIP 64147 |
6.00 |
| 2026-05-19 12:00 |
13:08:38.26 |
-05:52:46.3 |
HIP 64147 |
7.49 |
| 2026-05-20 00:00 |
13:08:29.02 |
-05:51:48.9 |
HIP 64147 |
9.40 |
| 2026-05-20 12:00 |
13:08:19.99 |
-05:50:52.7 |
HIP 64147 |
11.48 |
| 2026-05-21 00:00 |
13:08:11.16 |
-05:49:57.8 |
HIP 64147 |
13.62 |
| 2026-05-21 12:00 |
13:08:02.54 |
-05:49:04.3 |
HIP 64147 |
15.78 |
| 2026-05-22 00:00 |
13:07:54.12 |
-05:48:12.1 |
HIP 64147 |
17.93 |
| 2026-05-22 12:00 |
13:07:45.90 |
-05:47:21.2 |
HIP 64023 |
19.56 |
| 2026-05-23 00:00 |
13:07:37.89 |
-05:46:31.7 |
HIP 64023 |
19.54 |
| 2026-05-23 12:00 |
13:07:30.09 |
-05:45:43.4 |
HIP 64023 |
19.76 |
| 2026-05-24 00:00 |
13:07:22.49 |
-05:44:56.6 |
HIP 64023 |
20.17 |
| 2026-05-24 12:00 |
13:07:15.10 |
-05:44:11.0 |
HIP 64023 |
20.76 |
| 2026-05-25 00:00 |
13:07:07.92 |
-05:43:26.8 |
HIP 64023 |
21.49 |
| 2026-05-25 12:00 |
13:07:00.95 |
-05:42:44.0 |
HIP 64023 |
22.34 |
| 2026-05-26 00:00 |
13:06:54.19 |
-05:42:02.5 |
HIP 64023 |
23.27 |
| 2026-05-26 12:00 |
13:06:47.64 |
-05:41:22.4 |
HIP 64023 |
24.27 |
| 2026-05-27 00:00 |
13:06:41.30 |
-05:40:43.6 |
HIP 64023 |
25.32 |
| 2026-05-27 12:00 |
13:06:35.16 |
-05:40:06.1 |
HIP 64023 |
26.39 |
| 2026-05-28 00:00 |
13:06:29.24 |
-05:39:30.0 |
HIP 64023 |
27.49 |
| 2026-05-28 12:00 |
13:06:23.53 |
-05:38:55.3 |
HIP 64023 |
28.58 |
| 2026-05-29 00:00 |
13:06:18.04 |
-05:38:22.0 |
HIP 64023 |
29.67 |
| 2026-05-29 12:00 |
13:06:12.75 |
-05:37:50.0 |
HIP 63929 |
29.80 |
| 2026-05-30 00:00 |
13:06:07.67 |
-05:37:19.3 |
HIP 63929 |
29.22 |
| 2026-05-30 12:00 |
13:06:02.81 |
-05:36:50.0 |
HIP 63929 |
28.72 |
| 2026-05-31 00:00 |
13:05:58.16 |
-05:36:22.1 |
HIP 63929 |
28.29 |
| 2026-05-31 12:00 |
13:05:53.72 |
-05:35:55.5 |
HIP 63929 |
27.93 |
| 2026-06-01 00:00 |
13:05:49.50 |
-05:35:30.3 |
HIP 63929 |
27.63 |
| 2026-06-01 12:00 |
13:05:45.48 |
-05:35:06.5 |
HIP 63929 |
27.38 |
| 2026-06-02 00:00 |
13:05:41.68 |
-05:34:44.0 |
HIP 63929 |
27.19 |