| Parameter |
Value |
| Designation |
416P/Scotti |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2013-02-07T12:56:21.298560Z |
| Orbit solution date (soln_date, UTC) |
2025-04-24T09:42:34Z |
| Obs used |
138 |
| NEO |
- |
| M1 |
16.100 |
| K1 |
10.000 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2015-12-07.0000000 |
| e |
0.45570137 |
| q (au) |
2.180164 |
| a (au) |
4.005456 |
| i (deg) |
3.365426 |
| Ω (om, deg) |
355.801740 |
| ω (w, deg) |
134.673507 |
| M (ma, deg) |
126.940382 |
Magnitude
Scatter + Global Linear
$$
M_a = (15.729 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
15.729 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.558 |
| k |
0.800 |
| 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 |
23:03:30.18 |
-07:17:48.4 |
HIP 113748 |
32.27 |
| 2026-05-12 12:00 |
23:03:44.33 |
-07:16:20.0 |
HIP 113996 |
32.98 |
| 2026-05-13 00:00 |
23:03:58.38 |
-07:14:52.3 |
HIP 113996 |
32.07 |
| 2026-05-13 12:00 |
23:04:12.31 |
-07:13:25.2 |
HIP 113996 |
31.59 |
| 2026-05-14 00:00 |
23:04:26.14 |
-07:11:58.8 |
HIP 113936 |
30.62 |
| 2026-05-14 12:00 |
23:04:39.85 |
-07:10:33.1 |
HIP 113936 |
29.48 |
| 2026-05-15 00:00 |
23:04:53.46 |
-07:09:08.1 |
HIP 113936 |
28.78 |
| 2026-05-15 12:00 |
23:05:06.95 |
-07:07:43.8 |
HIP 114007 |
27.82 |
| 2026-05-16 00:00 |
23:05:20.32 |
-07:06:20.2 |
HIP 114007 |
26.23 |
| 2026-05-16 12:00 |
23:05:33.59 |
-07:04:57.3 |
HIP 114007 |
25.07 |
| 2026-05-17 00:00 |
23:05:46.73 |
-07:03:35.0 |
HIP 114007 |
24.38 |
| 2026-05-17 12:00 |
23:05:59.76 |
-07:02:13.5 |
HIP 114007 |
24.20 |
| 2026-05-18 00:00 |
23:06:12.68 |
-07:00:52.8 |
HIP 114007 |
24.51 |
| 2026-05-18 12:00 |
23:06:25.47 |
-06:59:32.7 |
HIP 114007 |
25.30 |
| 2026-05-19 00:00 |
23:06:38.15 |
-06:58:13.4 |
HIP 114007 |
26.50 |
| 2026-05-19 12:00 |
23:06:50.71 |
-06:56:54.8 |
HIP 114007 |
28.05 |
| 2026-05-20 00:00 |
23:07:03.15 |
-06:55:36.9 |
HIP 114257 |
28.43 |
| 2026-05-20 12:00 |
23:07:15.46 |
-06:54:19.8 |
HIP 114257 |
27.40 |
| 2026-05-21 00:00 |
23:07:27.66 |
-06:53:03.5 |
HIP 114257 |
26.74 |
| 2026-05-21 12:00 |
23:07:39.73 |
-06:51:47.9 |
HIP 114257 |
26.49 |
| 2026-05-22 00:00 |
23:07:51.69 |
-06:50:33.0 |
HIP 114257 |
26.62 |
| 2026-05-22 12:00 |
23:08:03.51 |
-06:49:18.9 |
HIP 114257 |
27.14 |
| 2026-05-23 00:00 |
23:08:15.22 |
-06:48:05.6 |
HIP 114257 |
27.99 |
| 2026-05-23 12:00 |
23:08:26.80 |
-06:46:53.0 |
HIP 114370 |
27.55 |
| 2026-05-24 00:00 |
23:08:38.26 |
-06:45:41.3 |
HIP 114370 |
26.40 |
| 2026-05-24 12:00 |
23:08:49.58 |
-06:44:30.3 |
HIP 114370 |
25.57 |
| 2026-05-25 00:00 |
23:09:00.79 |
-06:43:20.1 |
HIP 114370 |
25.10 |
| 2026-05-25 12:00 |
23:09:11.86 |
-06:42:10.6 |
HIP 114370 |
24.99 |
| 2026-05-26 00:00 |
23:09:22.81 |
-06:41:02.0 |
HIP 114370 |
25.22 |
| 2026-05-26 12:00 |
23:09:33.63 |
-06:39:54.2 |
HIP 114370 |
25.79 |
| 2026-05-27 00:00 |
23:09:44.32 |
-06:38:47.1 |
HIP 114370 |
26.65 |
| 2026-05-27 12:00 |
23:09:54.88 |
-06:37:40.9 |
HIP 114370 |
27.76 |
| 2026-05-28 00:00 |
23:10:05.31 |
-06:36:35.5 |
HIP 114370 |
29.10 |
| 2026-05-28 12:00 |
23:10:15.61 |
-06:35:30.9 |
HIP 114370 |
30.62 |
| 2026-05-29 00:00 |
23:10:25.78 |
-06:34:27.1 |
HIP 114370 |
32.28 |
| 2026-05-29 12:00 |
23:10:35.81 |
-06:33:24.1 |
HIP 114370 |
34.05 |
| 2026-05-30 00:00 |
23:10:45.71 |
-06:32:22.0 |
HIP 114445 |
34.78 |
| 2026-05-30 12:00 |
23:10:55.48 |
-06:31:20.7 |
HIP 114445 |
33.96 |
| 2026-05-31 00:00 |
23:11:05.12 |
-06:30:20.2 |
HIP 114445 |
33.33 |
| 2026-05-31 12:00 |
23:11:14.61 |
-06:29:20.6 |
HIP 114445 |
32.90 |
| 2026-06-01 00:00 |
23:11:23.97 |
-06:28:21.8 |
HIP 114445 |
32.66 |
| 2026-06-01 12:00 |
23:11:33.20 |
-06:27:23.9 |
HIP 114445 |
32.62 |
| 2026-06-02 00:00 |
23:11:42.29 |
-06:26:26.8 |
HIP 114445 |
32.77 |