| Parameter |
Value |
| Designation |
377P/Scotti |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2020-07-10T01:54:37.517760Z |
| Orbit solution date (soln_date, UTC) |
2022-07-06T03:13:02Z |
| Obs used |
192 |
| NEO |
- |
| M1 |
12.300 |
| K1 |
6.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2019-03-09T02:38:12.768000Z |
| Discovery magnitude (MPC) |
20.30 G |
| Discovery observatory (MPC) |
J04 · ESA Optical Ground Station, Tenerife |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2014-07-04.0000000 |
| e |
0.25147638 |
| q (au) |
5.036392 |
| a (au) |
6.728435 |
| i (deg) |
9.016997 |
| Ω (om, deg) |
226.030194 |
| ω (w, deg) |
354.469351 |
| M (ma, deg) |
235.870097 |
Magnitude
Scatter + Global Linear
$$
M_a = (11.033 + 2.762\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
11.033 |
| n |
2.762 |
| gf |
0.905 |
| gb |
-0.938 |
| k |
1.000 |
| δ90 |
9.615 |
| 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) |
| 2026-03-26 00:00 |
23:57:17.53 |
+05:51:48.2 |
HIP 118137 |
28.54 |
| 2026-03-26 12:00 |
23:57:34.13 |
+05:53:29.3 |
HIP 118137 |
29.42 |
| 2026-03-27 00:00 |
23:57:50.73 |
+05:55:10.5 |
HIP 118320 |
30.80 |
| 2026-03-27 12:00 |
23:58:07.31 |
+05:56:51.7 |
HIP 118320 |
26.60 |
| 2026-03-28 00:00 |
23:58:23.87 |
+05:58:33.1 |
HIP 118320 |
22.50 |
| 2026-03-28 12:00 |
23:58:40.43 |
+06:00:14.4 |
HIP 118320 |
18.57 |
| 2026-03-29 00:00 |
23:58:56.97 |
+06:01:55.9 |
HIP 118320 |
14.95 |
| 2026-03-29 12:00 |
23:59:13.50 |
+06:03:37.4 |
HIP 118320 |
11.89 |
| 2026-03-30 00:00 |
23:59:30.02 |
+06:05:18.9 |
HIP 118320 |
9.95 |
| 2026-03-30 12:00 |
23:59:46.52 |
+06:07:00.5 |
HIP 118320 |
9.80 |
| 2026-03-31 00:00 |
00:00:03.00 |
+06:08:42.2 |
HIP 118320 |
11.51 |
| 2026-03-31 12:00 |
00:00:19.47 |
+06:10:23.8 |
HIP 118320 |
14.43 |
| 2026-04-01 00:00 |
00:00:35.93 |
+06:12:05.5 |
HIP 118320 |
17.98 |
| 2026-04-01 12:00 |
00:00:52.37 |
+06:13:47.3 |
HIP 118320 |
21.85 |
| 2026-04-02 00:00 |
00:01:08.79 |
+06:15:29.1 |
HIP 188 |
19.37 |
| 2026-04-02 12:00 |
00:01:25.19 |
+06:17:10.9 |
HIP 188 |
15.03 |
| 2026-04-03 00:00 |
00:01:41.58 |
+06:18:52.7 |
HIP 188 |
10.75 |
| 2026-04-03 12:00 |
00:01:57.94 |
+06:20:34.5 |
HIP 188 |
6.65 |
| 2026-04-04 00:00 |
00:02:14.29 |
+06:22:16.4 |
HIP 188 |
3.43 |
| 2026-04-04 12:00 |
00:02:30.62 |
+06:23:58.3 |
HIP 188 |
4.25 |
| 2026-04-05 00:00 |
00:02:46.93 |
+06:25:40.1 |
HIP 188 |
7.94 |
| 2026-04-05 12:00 |
00:03:03.22 |
+06:27:22.0 |
HIP 188 |
12.10 |
| 2026-04-06 00:00 |
00:03:19.49 |
+06:29:03.9 |
HIP 188 |
16.38 |
| 2026-04-06 12:00 |
00:03:35.74 |
+06:30:45.8 |
HIP 376 |
16.26 |
| 2026-04-07 00:00 |
00:03:51.96 |
+06:32:27.7 |
HIP 376 |
12.27 |
| 2026-04-07 12:00 |
00:04:08.17 |
+06:34:09.5 |
HIP 376 |
8.66 |
| 2026-04-08 00:00 |
00:04:24.35 |
+06:35:51.4 |
HIP 376 |
6.14 |
| 2026-04-08 12:00 |
00:04:40.50 |
+06:37:33.2 |
HIP 376 |
6.20 |
| 2026-04-09 00:00 |
00:04:56.64 |
+06:39:15.1 |
HIP 376 |
8.78 |
| 2026-04-09 12:00 |
00:05:12.75 |
+06:40:56.9 |
HIP 376 |
12.39 |
| 2026-04-10 00:00 |
00:05:28.83 |
+06:42:38.6 |
HIP 376 |
16.35 |
| 2026-04-10 12:00 |
00:05:44.89 |
+06:44:20.4 |
HIP 376 |
20.47 |
| 2026-04-11 00:00 |
00:06:00.92 |
+06:46:02.1 |
HIP 581 |
16.99 |
| 2026-04-11 12:00 |
00:06:16.92 |
+06:47:43.7 |
HIP 581 |
12.67 |
| 2026-04-12 00:00 |
00:06:32.90 |
+06:49:25.3 |
HIP 581 |
8.36 |
| 2026-04-12 12:00 |
00:06:48.85 |
+06:51:06.9 |
HIP 581 |
4.06 |
| 2026-04-13 00:00 |
00:07:04.78 |
+06:52:48.4 |
HIP 581 |
0.31 |
| 2026-04-13 12:00 |
00:07:20.67 |
+06:54:29.9 |
HIP 581 |
4.54 |
| 2026-04-14 00:00 |
00:07:36.53 |
+06:56:11.3 |
HIP 581 |
8.83 |
| 2026-04-14 12:00 |
00:07:52.37 |
+06:57:52.6 |
HIP 581 |
13.10 |
| 2026-04-15 00:00 |
00:08:08.17 |
+06:59:33.9 |
HIP 581 |
17.37 |
| 2026-04-15 12:00 |
00:08:23.95 |
+07:01:15.0 |
HIP 581 |
21.63 |
| 2026-04-16 00:00 |
00:08:39.69 |
+07:02:56.2 |
HIP 581 |
25.89 |