| Parameter |
Value |
| Designation |
P/2017 D1 (Fuls) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2016-06-28T07:02:48.923520Z |
| Orbit solution date (soln_date, UTC) |
2022-07-31T01:43:22Z |
| Obs used |
77 |
| NEO |
- |
| M1 |
17.100 |
| K1 |
4.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2016-08-01.0000000 |
| e |
0.44033406 |
| q (au) |
2.687798 |
| a (au) |
4.802504 |
| i (deg) |
20.732652 |
| Ω (om, deg) |
82.335656 |
| ω (w, deg) |
7.257406 |
| M (ma, deg) |
3.156564 |
Magnitude
Scatter + Global Linear
$$
M_a = (12.621 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
12.621 |
| n |
6.000 |
| gf |
0.988 |
| gb |
-0.920 |
| k |
0.995 |
| δ90 |
9.860 |
| 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) |
| 2026-05-12 00:00 |
02:29:11.00 |
+01:11:05.2 |
HIP 11507 |
21.49 |
| 2026-05-12 12:00 |
02:29:52.16 |
+01:15:22.6 |
HIP 11507 |
26.08 |
| 2026-05-13 00:00 |
02:30:33.34 |
+01:19:39.3 |
HIP 11720 |
15.63 |
| 2026-05-13 12:00 |
02:31:14.54 |
+01:23:55.4 |
HIP 11720 |
7.03 |
| 2026-05-14 00:00 |
02:31:55.77 |
+01:28:10.8 |
HIP 11720 |
10.16 |
| 2026-05-14 12:00 |
02:32:37.02 |
+01:32:25.6 |
HIP 11853 |
9.26 |
| 2026-05-15 00:00 |
02:33:18.30 |
+01:36:39.8 |
HIP 11853 |
5.74 |
| 2026-05-15 12:00 |
02:33:59.59 |
+01:40:53.2 |
HIP 11853 |
15.13 |
| 2026-05-16 00:00 |
02:34:40.91 |
+01:45:06.0 |
HIP 11999 |
12.38 |
| 2026-05-16 12:00 |
02:35:22.25 |
+01:49:18.1 |
HIP 11999 |
13.24 |
| 2026-05-17 00:00 |
02:36:03.61 |
+01:53:29.6 |
HIP 11999 |
21.13 |
| 2026-05-17 12:00 |
02:36:44.99 |
+01:57:40.4 |
HIP 12205 |
27.94 |
| 2026-05-18 00:00 |
02:37:26.39 |
+02:01:50.5 |
HIP 12205 |
23.47 |
| 2026-05-18 12:00 |
02:38:07.81 |
+02:05:59.9 |
HIP 12294 |
21.01 |
| 2026-05-19 00:00 |
02:38:49.25 |
+02:10:08.6 |
HIP 12408 |
14.44 |
| 2026-05-19 12:00 |
02:39:30.70 |
+02:14:16.6 |
HIP 12408 |
7.54 |
| 2026-05-20 00:00 |
02:40:12.18 |
+02:18:23.9 |
HIP 12408 |
12.39 |
| 2026-05-20 12:00 |
02:40:53.67 |
+02:22:30.6 |
HIP 12408 |
22.33 |
| 2026-05-21 00:00 |
02:41:35.17 |
+02:26:36.5 |
HIP 12496 |
29.80 |
| 2026-05-21 12:00 |
02:42:16.70 |
+02:30:41.7 |
HIP 12743 |
29.62 |
| 2026-05-22 00:00 |
02:42:58.23 |
+02:34:46.3 |
HIP 12743 |
19.22 |
| 2026-05-22 12:00 |
02:43:39.79 |
+02:38:50.1 |
HIP 12743 |
10.50 |
| 2026-05-23 00:00 |
02:44:21.36 |
+02:42:53.2 |
HIP 12743 |
9.98 |
| 2026-05-23 12:00 |
02:45:02.94 |
+02:46:55.6 |
HIP 12743 |
18.37 |
| 2026-05-24 00:00 |
02:45:44.53 |
+02:50:57.3 |
HIP 12743 |
28.70 |
| 2026-05-24 12:00 |
02:46:26.15 |
+02:54:58.3 |
HIP 12946 |
23.69 |
| 2026-05-25 00:00 |
02:47:07.77 |
+02:58:58.6 |
HIP 13031 |
20.95 |
| 2026-05-25 12:00 |
02:47:49.41 |
+03:02:58.1 |
HIP 13031 |
17.09 |
| 2026-05-26 00:00 |
02:48:31.06 |
+03:06:57.0 |
HIP 13031 |
19.84 |
| 2026-05-26 12:00 |
02:49:12.72 |
+03:10:55.1 |
HIP 13031 |
27.27 |
| 2026-05-27 00:00 |
02:49:54.40 |
+03:14:52.5 |
HIP 13314 |
24.43 |
| 2026-05-27 12:00 |
02:50:36.08 |
+03:18:49.2 |
HIP 13314 |
19.03 |
| 2026-05-28 00:00 |
02:51:17.78 |
+03:22:45.2 |
HIP 13314 |
19.36 |
| 2026-05-28 12:00 |
02:51:59.49 |
+03:26:40.4 |
HIP 13412 |
14.35 |
| 2026-05-29 00:00 |
02:52:41.21 |
+03:30:34.9 |
HIP 13412 |
13.75 |
| 2026-05-29 12:00 |
02:53:22.94 |
+03:34:28.7 |
HIP 13412 |
20.47 |
| 2026-05-30 00:00 |
02:54:04.69 |
+03:38:21.7 |
HIP 13593 |
18.29 |
| 2026-05-30 12:00 |
02:54:46.44 |
+03:42:14.1 |
HIP 13593 |
14.10 |
| 2026-05-31 00:00 |
02:55:28.20 |
+03:46:05.6 |
HIP 13593 |
17.61 |
| 2026-05-31 12:00 |
02:56:09.97 |
+03:49:56.5 |
HIP 13682 |
13.01 |
| 2026-06-01 00:00 |
02:56:51.75 |
+03:53:46.6 |
HIP 13682 |
13.11 |
| 2026-06-01 12:00 |
02:57:33.54 |
+03:57:36.0 |
HIP 13762 |
17.90 |
| 2026-06-02 00:00 |
02:58:15.34 |
+04:01:24.6 |
HIP 13762 |
26.40 |