| 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 |
1.000 |
| gb |
-0.975 |
| k |
1.000 |
| δ90 |
9.996 |
| 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 |
13:59:56.29 |
-10:55:52.0 |
HIP 68376 |
29.70 |
| 2026-09-20 12:00 |
14:00:23.28 |
-10:58:17.2 |
HIP 68376 |
33.25 |
| 2026-09-21 00:00 |
14:00:50.33 |
-11:00:42.4 |
HIP 68376 |
37.80 |
| 2026-09-21 12:00 |
14:01:17.44 |
-11:03:07.7 |
HIP 68671 |
32.24 |
| 2026-09-22 00:00 |
14:01:44.60 |
-11:05:33.1 |
HIP 68671 |
26.26 |
| 2026-09-22 12:00 |
14:02:11.82 |
-11:07:58.5 |
HIP 68671 |
20.99 |
| 2026-09-23 00:00 |
14:02:39.10 |
-11:10:23.9 |
HIP 68671 |
17.08 |
| 2026-09-23 12:00 |
14:03:06.43 |
-11:12:49.4 |
HIP 68671 |
15.64 |
| 2026-09-24 00:00 |
14:03:33.81 |
-11:15:14.9 |
HIP 68671 |
17.29 |
| 2026-09-24 12:00 |
14:04:01.25 |
-11:17:40.5 |
HIP 68754 |
13.16 |
| 2026-09-25 00:00 |
14:04:28.73 |
-11:20:06.1 |
HIP 68754 |
9.69 |
| 2026-09-25 12:00 |
14:04:56.28 |
-11:22:31.7 |
HIP 68754 |
10.84 |
| 2026-09-26 00:00 |
14:05:23.87 |
-11:24:57.4 |
HIP 68861 |
14.07 |
| 2026-09-26 12:00 |
14:05:51.51 |
-11:27:23.1 |
HIP 68861 |
8.47 |
| 2026-09-27 00:00 |
14:06:19.21 |
-11:29:48.7 |
HIP 68861 |
7.00 |
| 2026-09-27 12:00 |
14:06:46.95 |
-11:32:14.4 |
HIP 68861 |
11.42 |
| 2026-09-28 00:00 |
14:07:14.75 |
-11:34:40.1 |
HIP 68861 |
17.79 |
| 2026-09-28 12:00 |
14:07:42.59 |
-11:37:05.8 |
HIP 69092 |
17.02 |
| 2026-09-29 00:00 |
14:08:10.48 |
-11:39:31.5 |
HIP 69092 |
11.20 |
| 2026-09-29 12:00 |
14:08:38.42 |
-11:41:57.2 |
HIP 69092 |
8.15 |
| 2026-09-30 00:00 |
14:09:06.41 |
-11:44:22.8 |
HIP 69092 |
10.62 |
| 2026-09-30 12:00 |
14:09:34.45 |
-11:46:48.5 |
HIP 69092 |
16.29 |
| 2026-10-01 00:00 |
14:10:02.53 |
-11:49:14.1 |
HIP 69305 |
17.81 |
| 2026-10-01 12:00 |
14:10:30.66 |
-11:51:39.7 |
HIP 69305 |
10.60 |
| 2026-10-02 00:00 |
14:10:58.83 |
-11:54:05.3 |
HIP 69305 |
3.76 |
| 2026-10-02 12:00 |
14:11:27.06 |
-11:56:30.8 |
HIP 69348 |
3.64 |
| 2026-10-03 00:00 |
14:11:55.32 |
-11:58:56.3 |
HIP 69348 |
7.26 |
| 2026-10-03 12:00 |
14:12:23.63 |
-12:01:21.8 |
HIP 69348 |
14.13 |
| 2026-10-04 00:00 |
14:12:51.99 |
-12:03:47.2 |
HIP 69470 |
9.12 |
| 2026-10-04 12:00 |
14:13:20.39 |
-12:06:12.6 |
HIP 69470 |
3.20 |
| 2026-10-05 00:00 |
14:13:48.83 |
-12:08:37.9 |
HIP 69470 |
6.75 |
| 2026-10-05 12:00 |
14:14:17.31 |
-12:11:03.1 |
HIP 69470 |
13.77 |
| 2026-10-06 00:00 |
14:14:45.84 |
-12:13:28.3 |
HIP 69657 |
9.15 |
| 2026-10-06 12:00 |
14:15:14.41 |
-12:15:53.4 |
HIP 69657 |
2.50 |
| 2026-10-07 00:00 |
14:15:43.02 |
-12:18:18.5 |
HIP 69657 |
6.16 |
| 2026-10-07 12:00 |
14:16:11.67 |
-12:20:43.4 |
HIP 69657 |
13.38 |
| 2026-10-08 00:00 |
14:16:40.36 |
-12:23:08.3 |
HIP 69657 |
20.74 |
| 2026-10-08 12:00 |
14:17:09.08 |
-12:25:33.0 |
HIP 69657 |
28.14 |
| 2026-10-09 00:00 |
14:17:37.85 |
-12:27:57.7 |
HIP 69945 |
29.80 |
| 2026-10-09 12:00 |
14:18:06.65 |
-12:30:22.3 |
HIP 69945 |
28.54 |
| 2026-10-10 00:00 |
14:18:35.49 |
-12:32:46.8 |
HIP 69945 |
29.18 |
| 2026-10-10 12:00 |
14:19:04.37 |
-12:35:11.1 |
HIP 69945 |
31.61 |
| 2026-10-11 00:00 |
14:19:33.28 |
-12:37:35.4 |
HIP 69945 |
35.47 |