| Parameter |
Value |
| Designation |
387P/Boattini |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2019-09-05T08:47:45.003840Z |
| Orbit solution date (soln_date, UTC) |
2021-05-02T23:43:04Z |
| Obs used |
347 |
| NEO |
Yes |
| M1 |
14.200 |
| K1 |
20.000 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2019-09-02T00:13:13.152000Z |
| Discovery magnitude (MPC) |
15.80 R |
| Discovery observatory (MPC) |
L51 · MARGO, Nauchnyi |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2015-04-08.0000000 |
| e |
0.73595147 |
| q (au) |
1.267166 |
| a (au) |
4.798990 |
| i (deg) |
8.899824 |
| Ω (om, deg) |
259.355998 |
| ω (w, deg) |
162.776863 |
| M (ma, deg) |
208.931599 |
Magnitude
Scatter + Global Linear
$$
M_a = (14.112 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
14.112 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.502 |
| 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 |
17:01:21.84 |
-23:47:16.5 |
HIP 83356 |
31.86 |
| 2026-05-12 12:00 |
17:01:09.01 |
-23:46:53.2 |
HIP 83099 |
31.37 |
| 2026-05-13 00:00 |
17:00:56.11 |
-23:46:29.8 |
HIP 83099 |
28.40 |
| 2026-05-13 12:00 |
17:00:43.12 |
-23:46:06.1 |
HIP 83099 |
25.41 |
| 2026-05-14 00:00 |
17:00:30.06 |
-23:45:42.2 |
HIP 83099 |
22.41 |
| 2026-05-14 12:00 |
17:00:16.92 |
-23:45:18.1 |
HIP 83099 |
19.39 |
| 2026-05-15 00:00 |
17:00:03.70 |
-23:44:53.7 |
HIP 83099 |
16.36 |
| 2026-05-15 12:00 |
16:59:50.41 |
-23:44:29.1 |
HIP 83099 |
13.32 |
| 2026-05-16 00:00 |
16:59:37.05 |
-23:44:04.4 |
HIP 83099 |
10.28 |
| 2026-05-16 12:00 |
16:59:23.61 |
-23:43:39.3 |
HIP 83099 |
7.27 |
| 2026-05-17 00:00 |
16:59:10.11 |
-23:43:14.1 |
HIP 83099 |
4.38 |
| 2026-05-17 12:00 |
16:58:56.54 |
-23:42:48.7 |
HIP 83099 |
2.20 |
| 2026-05-18 00:00 |
16:58:42.90 |
-23:42:23.0 |
HIP 83099 |
3.21 |
| 2026-05-18 12:00 |
16:58:29.20 |
-23:41:57.2 |
HIP 83099 |
5.98 |
| 2026-05-19 00:00 |
16:58:15.44 |
-23:41:31.1 |
HIP 83099 |
9.03 |
| 2026-05-19 12:00 |
16:58:01.61 |
-23:41:04.8 |
HIP 83099 |
12.16 |
| 2026-05-20 00:00 |
16:57:47.73 |
-23:40:38.4 |
HIP 83099 |
15.33 |
| 2026-05-20 12:00 |
16:57:33.79 |
-23:40:11.7 |
HIP 83099 |
18.53 |
| 2026-05-21 00:00 |
16:57:19.79 |
-23:39:44.8 |
HIP 82858 |
18.13 |
| 2026-05-21 12:00 |
16:57:05.74 |
-23:39:17.7 |
HIP 82858 |
14.96 |
| 2026-05-22 00:00 |
16:56:51.64 |
-23:38:50.4 |
HIP 82858 |
11.82 |
| 2026-05-22 12:00 |
16:56:37.49 |
-23:38:22.9 |
HIP 82858 |
8.76 |
| 2026-05-23 00:00 |
16:56:23.29 |
-23:37:55.2 |
HIP 82858 |
5.91 |
| 2026-05-23 12:00 |
16:56:09.05 |
-23:37:27.3 |
HIP 82858 |
3.85 |
| 2026-05-24 00:00 |
16:55:54.75 |
-23:36:59.2 |
HIP 82858 |
4.06 |
| 2026-05-24 12:00 |
16:55:40.42 |
-23:36:30.9 |
HIP 82858 |
6.33 |
| 2026-05-25 00:00 |
16:55:26.04 |
-23:36:02.5 |
HIP 82858 |
9.27 |
| 2026-05-25 12:00 |
16:55:11.63 |
-23:35:33.8 |
HIP 82758 |
6.78 |
| 2026-05-26 00:00 |
16:54:57.17 |
-23:35:05.0 |
HIP 82758 |
4.58 |
| 2026-05-26 12:00 |
16:54:42.68 |
-23:34:36.0 |
HIP 82758 |
4.29 |
| 2026-05-27 00:00 |
16:54:28.15 |
-23:34:06.8 |
HIP 82758 |
6.20 |
| 2026-05-27 12:00 |
16:54:13.59 |
-23:33:37.4 |
HIP 82758 |
9.01 |
| 2026-05-28 00:00 |
16:53:59.00 |
-23:33:07.8 |
HIP 82758 |
12.12 |
| 2026-05-28 12:00 |
16:53:44.38 |
-23:32:38.1 |
HIP 82758 |
15.35 |
| 2026-05-29 00:00 |
16:53:29.74 |
-23:32:08.1 |
HIP 82576 |
16.36 |
| 2026-05-29 12:00 |
16:53:15.06 |
-23:31:38.0 |
HIP 82576 |
14.33 |
| 2026-05-30 00:00 |
16:53:00.36 |
-23:31:07.8 |
HIP 82576 |
12.90 |
| 2026-05-30 12:00 |
16:52:45.64 |
-23:30:37.4 |
HIP 82576 |
12.26 |
| 2026-05-31 00:00 |
16:52:30.90 |
-23:30:06.8 |
HIP 82576 |
12.56 |
| 2026-05-31 12:00 |
16:52:16.13 |
-23:29:36.0 |
HIP 82576 |
13.73 |
| 2026-06-01 00:00 |
16:52:01.35 |
-23:29:05.1 |
HIP 82576 |
15.58 |
| 2026-06-01 12:00 |
16:51:46.55 |
-23:28:34.0 |
HIP 82576 |
17.91 |
| 2026-06-02 00:00 |
16:51:31.74 |
-23:28:02.8 |
HIP 82576 |
20.55 |