| Parameter |
Value |
| Designation |
398P/Boattini |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2020-12-26T17:48:53.328960Z |
| Orbit solution date (soln_date, UTC) |
2026-07-28T20:12:22Z |
| Obs used |
1649 |
| NEO |
- |
| M1 |
15.200 |
| K1 |
11.500 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2020-08-11T13:58:29.683200Z |
| Discovery magnitude (MPC) |
19.11 o |
| Discovery observatory (MPC) |
T08 · ATLAS-MLO, Mauna Loa |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2020-11-13.0000000 |
| e |
0.58256104 |
| q (au) |
1.305705 |
| a (au) |
3.127894 |
| i (deg) |
11.015214 |
| Ω (om, deg) |
127.464427 |
| ω (w, deg) |
320.231221 |
| M (ma, deg) |
352.206590 |
Magnitude
Scatter + Global Linear
$$
M_a = (20.000 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
20.000 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.883 |
| k |
0.995 |
| 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
Finding Chart
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
07:43:24.89 |
+18:55:14.7 |
HIP 37644 |
21.37 |
| 2026-07-29 12:00 |
07:45:13.45 |
+18:53:07.6 |
HIP 37745 |
19.95 |
| 2026-07-30 00:00 |
07:47:01.84 |
+18:50:56.6 |
HIP 37984 |
3.83 |
| 2026-07-30 12:00 |
07:48:50.06 |
+18:48:41.9 |
HIP 38027 |
22.59 |
| 2026-07-31 00:00 |
07:50:38.10 |
+18:46:23.3 |
HIP 38332 |
9.19 |
| 2026-07-31 12:00 |
07:52:25.96 |
+18:44:01.0 |
HIP 38465 |
7.28 |
| 2026-08-01 00:00 |
07:54:13.65 |
+18:41:34.9 |
HIP 38465 |
22.34 |
| 2026-08-01 12:00 |
07:56:01.15 |
+18:39:05.1 |
HIP 38899 |
24.81 |
| 2026-08-02 00:00 |
07:57:48.46 |
+18:36:31.6 |
HIP 38899 |
11.84 |
| 2026-08-02 12:00 |
07:59:35.59 |
+18:33:54.4 |
HIP 39158 |
21.43 |
| 2026-08-03 00:00 |
08:01:22.52 |
+18:31:13.7 |
HIP 39215 |
8.00 |
| 2026-08-03 12:00 |
08:03:09.26 |
+18:28:29.3 |
HIP 39215 |
27.36 |
| 2026-08-04 00:00 |
08:04:55.81 |
+18:25:41.4 |
HIP 39535 |
24.96 |
| 2026-08-04 12:00 |
08:06:42.16 |
+18:22:49.9 |
HIP 39644 |
23.73 |
| 2026-08-05 00:00 |
08:08:28.30 |
+18:19:54.9 |
HIP 39805 |
22.46 |
| 2026-08-05 12:00 |
08:10:14.25 |
+18:16:56.5 |
HIP 40187 |
35.56 |
| 2026-08-06 00:00 |
08:11:59.99 |
+18:13:54.6 |
HIP 40187 |
18.71 |
| 2026-08-06 12:00 |
08:13:45.52 |
+18:10:49.3 |
HIP 40187 |
26.70 |
| 2026-08-07 00:00 |
08:15:30.84 |
+18:07:40.7 |
HIP 40564 |
20.42 |
| 2026-08-07 12:00 |
08:17:15.95 |
+18:04:28.7 |
HIP 40564 |
4.78 |
| 2026-08-08 00:00 |
08:19:00.84 |
+18:01:13.4 |
HIP 40747 |
8.64 |
| 2026-08-08 12:00 |
08:20:45.52 |
+17:57:54.9 |
HIP 40747 |
26.82 |
| 2026-08-09 00:00 |
08:22:29.98 |
+17:54:33.1 |
HIP 41120 |
19.03 |
| 2026-08-09 12:00 |
08:24:14.22 |
+17:51:08.1 |
HIP 41120 |
20.57 |
| 2026-08-10 00:00 |
08:25:58.24 |
+17:47:40.0 |
HIP 41326 |
2.48 |
| 2026-08-10 12:00 |
08:27:42.03 |
+17:44:08.7 |
HIP 41505 |
20.18 |
| 2026-08-11 00:00 |
08:29:25.60 |
+17:40:34.4 |
HIP 41505 |
32.12 |
| 2026-08-11 12:00 |
08:31:08.93 |
+17:36:57.0 |
HIP 41818 |
17.63 |
| 2026-08-12 00:00 |
08:32:52.04 |
+17:33:16.6 |
HIP 42005 |
13.04 |
| 2026-08-12 12:00 |
08:34:34.91 |
+17:29:33.2 |
HIP 42005 |
15.67 |
| 2026-08-13 00:00 |
08:36:17.54 |
+17:25:46.9 |
HIP 42209 |
8.51 |
| 2026-08-13 12:00 |
08:37:59.94 |
+17:21:57.7 |
HIP 42277 |
13.06 |
| 2026-08-14 00:00 |
08:39:42.11 |
+17:18:05.6 |
HIP 42471 |
10.90 |
| 2026-08-14 12:00 |
08:41:24.03 |
+17:14:10.7 |
HIP 42764 |
21.99 |
| 2026-08-15 00:00 |
08:43:05.70 |
+17:10:13.0 |
HIP 42764 |
3.86 |
| 2026-08-15 12:00 |
08:44:47.14 |
+17:06:12.6 |
HIP 42968 |
13.72 |
| 2026-08-16 00:00 |
08:46:28.33 |
+17:02:09.5 |
HIP 43162 |
14.72 |
| 2026-08-16 12:00 |
08:48:09.28 |
+16:58:03.7 |
HIP 43162 |
9.79 |
| 2026-08-17 00:00 |
08:49:49.97 |
+16:53:55.3 |
HIP 43412 |
13.09 |
| 2026-08-17 12:00 |
08:51:30.42 |
+16:49:44.3 |
HIP 43412 |
18.31 |
| 2026-08-18 00:00 |
08:53:10.62 |
+16:45:30.8 |
HIP 43751 |
23.51 |
| 2026-08-18 12:00 |
08:54:50.57 |
+16:41:14.7 |
HIP 43751 |
5.05 |
| 2026-08-19 00:00 |
08:56:30.26 |
+16:36:56.1 |
HIP 43975 |
23.10 |