| 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) |
| 2026-06-01 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 |
| 2026-06-02 12:00 |
16:51:16.92 |
-23:27:31.4 |
HIP 82376 |
17.77 |
| 2026-06-03 00:00 |
16:51:02.08 |
-23:27:00.0 |
HIP 82376 |
14.35 |
| 2026-06-03 12:00 |
16:50:47.24 |
-23:26:28.2 |
HIP 82376 |
10.96 |
| 2026-06-04 00:00 |
16:50:32.38 |
-23:25:56.4 |
HIP 82376 |
7.60 |
| 2026-06-04 12:00 |
16:50:17.53 |
-23:25:24.5 |
HIP 82376 |
4.39 |
| 2026-06-05 00:00 |
16:50:02.66 |
-23:24:52.4 |
HIP 82376 |
2.15 |
| 2026-06-05 12:00 |
16:49:47.80 |
-23:24:20.2 |
HIP 82376 |
3.71 |
| 2026-06-06 00:00 |
16:49:32.93 |
-23:23:47.8 |
HIP 82376 |
6.83 |
| 2026-06-06 12:00 |
16:49:18.07 |
-23:23:15.4 |
HIP 82376 |
10.18 |
| 2026-06-07 00:00 |
16:49:03.21 |
-23:22:42.8 |
HIP 82376 |
13.57 |
| 2026-06-07 12:00 |
16:48:48.35 |
-23:22:10.0 |
HIP 82376 |
16.99 |
| 2026-06-08 00:00 |
16:48:33.50 |
-23:21:37.2 |
HIP 82376 |
20.42 |
| 2026-06-08 12:00 |
16:48:18.66 |
-23:21:04.2 |
HIP 82376 |
23.86 |
| 2026-06-09 00:00 |
16:48:03.83 |
-23:20:31.2 |
HIP 82376 |
27.29 |
| 2026-06-09 12:00 |
16:47:49.01 |
-23:19:58.0 |
HIP 82376 |
30.73 |
| 2026-06-10 00:00 |
16:47:34.20 |
-23:19:24.7 |
HIP 82376 |
34.17 |
| 2026-06-10 12:00 |
16:47:19.41 |
-23:18:51.4 |
HIP 82007 |
31.03 |
| 2026-06-11 00:00 |
16:47:04.63 |
-23:18:17.9 |
HIP 82007 |
27.61 |
| 2026-06-11 12:00 |
16:46:49.88 |
-23:17:44.3 |
HIP 82007 |
24.19 |
| 2026-06-12 00:00 |
16:46:35.14 |
-23:17:10.7 |
HIP 82007 |
20.79 |
| 2026-06-12 12:00 |
16:46:20.43 |
-23:16:37.0 |
HIP 82007 |
17.40 |
| 2026-06-13 00:00 |
16:46:05.74 |
-23:16:03.2 |
HIP 82007 |
14.04 |
| 2026-06-13 12:00 |
16:45:51.08 |
-23:15:29.3 |
HIP 82007 |
10.71 |
| 2026-06-14 00:00 |
16:45:36.45 |
-23:14:55.3 |
HIP 82007 |
7.47 |
| 2026-06-14 12:00 |
16:45:21.84 |
-23:14:21.3 |
HIP 82007 |
4.49 |
| 2026-06-15 00:00 |
16:45:07.27 |
-23:13:47.2 |
HIP 82007 |
2.77 |
| 2026-06-15 12:00 |
16:44:52.74 |
-23:13:13.1 |
HIP 82007 |
4.26 |
| 2026-06-16 00:00 |
16:44:38.24 |
-23:12:38.9 |
HIP 82007 |
7.18 |
| 2026-06-16 12:00 |
16:44:23.77 |
-23:12:04.7 |
HIP 81908 |
8.81 |
| 2026-06-17 00:00 |
16:44:09.35 |
-23:11:30.4 |
HIP 81908 |
5.72 |
| 2026-06-17 12:00 |
16:43:54.97 |
-23:10:56.0 |
HIP 81908 |
3.26 |
| 2026-06-18 00:00 |
16:43:40.63 |
-23:10:21.7 |
HIP 81908 |
3.31 |
| 2026-06-18 12:00 |
16:43:26.33 |
-23:09:47.3 |
HIP 81908 |
5.79 |
| 2026-06-19 00:00 |
16:43:12.08 |
-23:09:12.8 |
HIP 81908 |
8.85 |
| 2026-06-19 12:00 |
16:42:57.88 |
-23:08:38.4 |
HIP 81908 |
12.03 |
| 2026-06-20 00:00 |
16:42:43.73 |
-23:08:03.9 |
HIP 81908 |
15.26 |
| 2026-06-20 12:00 |
16:42:29.63 |
-23:07:29.4 |
HIP 81908 |
18.51 |
| 2026-06-21 00:00 |
16:42:15.59 |
-23:06:54.9 |
HIP 81688 |
19.01 |
| 2026-06-21 12:00 |
16:42:01.60 |
-23:06:20.4 |
HIP 81688 |
17.16 |
| 2026-06-22 00:00 |
16:41:47.66 |
-23:05:45.9 |
HIP 81688 |
15.79 |