| 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) |
| 2026-03-26 00:00 |
17:12:55.86 |
-24:07:24.5 |
HIP 84284 |
12.22 |
| 2026-03-26 12:00 |
17:12:54.73 |
-24:07:20.9 |
HIP 84284 |
12.44 |
| 2026-03-27 00:00 |
17:12:53.46 |
-24:07:17.2 |
HIP 84284 |
12.69 |
| 2026-03-27 12:00 |
17:12:52.05 |
-24:07:13.2 |
HIP 84284 |
12.97 |
| 2026-03-28 00:00 |
17:12:50.49 |
-24:07:09.1 |
HIP 84284 |
13.29 |
| 2026-03-28 12:00 |
17:12:48.80 |
-24:07:04.8 |
HIP 84284 |
13.64 |
| 2026-03-29 00:00 |
17:12:46.96 |
-24:07:00.4 |
HIP 84284 |
14.02 |
| 2026-03-29 12:00 |
17:12:44.98 |
-24:06:55.7 |
HIP 84284 |
14.43 |
| 2026-03-30 00:00 |
17:12:42.86 |
-24:06:50.9 |
HIP 84284 |
14.88 |
| 2026-03-30 12:00 |
17:12:40.59 |
-24:06:45.9 |
HIP 84284 |
15.36 |
| 2026-03-31 00:00 |
17:12:38.18 |
-24:06:40.7 |
HIP 84284 |
15.88 |
| 2026-03-31 12:00 |
17:12:35.63 |
-24:06:35.4 |
HIP 84284 |
16.43 |
| 2026-04-01 00:00 |
17:12:32.94 |
-24:06:29.8 |
HIP 84284 |
17.01 |
| 2026-04-01 12:00 |
17:12:30.11 |
-24:06:24.1 |
HIP 84284 |
17.63 |
| 2026-04-02 00:00 |
17:12:27.13 |
-24:06:18.2 |
HIP 84284 |
18.28 |
| 2026-04-02 12:00 |
17:12:24.02 |
-24:06:12.1 |
HIP 84284 |
18.96 |
| 2026-04-03 00:00 |
17:12:20.76 |
-24:06:05.8 |
HIP 84284 |
19.68 |
| 2026-04-03 12:00 |
17:12:17.36 |
-24:05:59.3 |
HIP 84284 |
20.43 |
| 2026-04-04 00:00 |
17:12:13.81 |
-24:05:52.6 |
HIP 84284 |
21.22 |
| 2026-04-04 12:00 |
17:12:10.13 |
-24:05:45.8 |
HIP 84284 |
22.04 |
| 2026-04-05 00:00 |
17:12:06.30 |
-24:05:38.8 |
HIP 84284 |
22.89 |
| 2026-04-05 12:00 |
17:12:02.33 |
-24:05:31.5 |
HIP 84261 |
23.59 |
| 2026-04-06 00:00 |
17:11:58.23 |
-24:05:24.1 |
HIP 84261 |
24.31 |
| 2026-04-06 12:00 |
17:11:53.97 |
-24:05:16.5 |
HIP 84261 |
25.07 |
| 2026-04-07 00:00 |
17:11:49.58 |
-24:05:08.7 |
HIP 83981 |
24.38 |
| 2026-04-07 12:00 |
17:11:45.05 |
-24:05:00.7 |
HIP 83981 |
23.34 |
| 2026-04-08 00:00 |
17:11:40.38 |
-24:04:52.5 |
HIP 83981 |
22.27 |
| 2026-04-08 12:00 |
17:11:35.56 |
-24:04:44.1 |
HIP 83981 |
21.16 |
| 2026-04-09 00:00 |
17:11:30.61 |
-24:04:35.5 |
HIP 83981 |
20.02 |
| 2026-04-09 12:00 |
17:11:25.52 |
-24:04:26.7 |
HIP 83981 |
18.85 |
| 2026-04-10 00:00 |
17:11:20.28 |
-24:04:17.7 |
HIP 83981 |
17.65 |
| 2026-04-10 12:00 |
17:11:14.91 |
-24:04:08.5 |
HIP 83981 |
16.42 |
| 2026-04-11 00:00 |
17:11:09.39 |
-24:03:59.1 |
HIP 83981 |
15.16 |
| 2026-04-11 12:00 |
17:11:03.74 |
-24:03:49.5 |
HIP 83981 |
13.86 |
| 2026-04-12 00:00 |
17:10:57.95 |
-24:03:39.7 |
HIP 83981 |
12.54 |
| 2026-04-12 12:00 |
17:10:52.02 |
-24:03:29.7 |
HIP 83981 |
11.18 |
| 2026-04-13 00:00 |
17:10:45.95 |
-24:03:19.5 |
HIP 83981 |
9.80 |
| 2026-04-13 12:00 |
17:10:39.75 |
-24:03:09.1 |
HIP 83981 |
8.38 |
| 2026-04-14 00:00 |
17:10:33.40 |
-24:02:58.5 |
HIP 83981 |
6.95 |
| 2026-04-14 12:00 |
17:10:26.92 |
-24:02:47.7 |
HIP 83981 |
5.49 |
| 2026-04-15 00:00 |
17:10:20.31 |
-24:02:36.7 |
HIP 83981 |
4.03 |
| 2026-04-15 12:00 |
17:10:13.55 |
-24:02:25.4 |
HIP 83981 |
2.62 |
| 2026-04-16 00:00 |
17:10:06.66 |
-24:02:14.0 |
HIP 83981 |
1.50 |