| 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
$$
M_a = (12.648 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
12.648 |
| n |
6.000 |
| gf |
0.936 |
| gb |
-0.920 |
| k |
0.995 |
| δ90 |
8.212 |
| 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 |
04:16:10.59 |
+09:48:10.3 |
HIP 19799 |
26.39 |
| 2026-07-29 12:00 |
04:16:49.23 |
+09:50:26.3 |
HIP 20062 |
20.49 |
| 2026-07-30 00:00 |
04:17:27.79 |
+09:52:41.6 |
HIP 20062 |
13.34 |
| 2026-07-30 12:00 |
04:18:06.28 |
+09:54:56.2 |
HIP 20062 |
11.24 |
| 2026-07-31 00:00 |
04:18:44.69 |
+09:57:10.0 |
HIP 20135 |
12.74 |
| 2026-07-31 12:00 |
04:19:23.03 |
+09:59:23.0 |
HIP 20188 |
8.67 |
| 2026-08-01 00:00 |
04:20:01.29 |
+10:01:35.3 |
HIP 20188 |
8.19 |
| 2026-08-01 12:00 |
04:20:39.46 |
+10:03:46.9 |
HIP 20188 |
15.67 |
| 2026-08-02 00:00 |
04:21:17.56 |
+10:05:57.8 |
HIP 20188 |
24.68 |
| 2026-08-02 12:00 |
04:21:55.58 |
+10:08:07.9 |
HIP 20447 |
25.75 |
| 2026-08-03 00:00 |
04:22:33.51 |
+10:10:17.2 |
HIP 20447 |
24.38 |
| 2026-08-03 12:00 |
04:23:11.36 |
+10:12:25.9 |
HIP 20597 |
24.30 |
| 2026-08-04 00:00 |
04:23:49.12 |
+10:14:33.8 |
HIP 20597 |
17.54 |
| 2026-08-04 12:00 |
04:24:26.80 |
+10:16:41.0 |
HIP 20597 |
14.37 |
| 2026-08-05 00:00 |
04:25:04.38 |
+10:18:47.5 |
HIP 20597 |
16.91 |
| 2026-08-05 12:00 |
04:25:41.88 |
+10:20:53.3 |
HIP 20597 |
23.32 |
| 2026-08-06 00:00 |
04:26:19.29 |
+10:22:58.4 |
HIP 20832 |
23.36 |
| 2026-08-06 12:00 |
04:26:56.61 |
+10:25:02.7 |
HIP 20832 |
15.50 |
| 2026-08-07 00:00 |
04:27:33.83 |
+10:27:06.4 |
HIP 20832 |
10.56 |
| 2026-08-07 12:00 |
04:28:10.96 |
+10:29:09.3 |
HIP 20832 |
12.60 |
| 2026-08-08 00:00 |
04:28:47.99 |
+10:31:11.6 |
HIP 20963 |
13.49 |
| 2026-08-08 12:00 |
04:29:24.93 |
+10:33:13.2 |
HIP 20963 |
4.80 |
| 2026-08-09 00:00 |
04:30:01.76 |
+10:35:14.0 |
HIP 20963 |
6.08 |
| 2026-08-09 12:00 |
04:30:38.49 |
+10:37:14.2 |
HIP 21066 |
9.10 |
| 2026-08-10 00:00 |
04:31:15.13 |
+10:39:13.7 |
HIP 21066 |
7.36 |
| 2026-08-10 12:00 |
04:31:51.65 |
+10:41:12.6 |
HIP 21176 |
8.42 |
| 2026-08-11 00:00 |
04:32:28.07 |
+10:43:10.8 |
HIP 21176 |
4.89 |
| 2026-08-11 12:00 |
04:33:04.39 |
+10:45:08.3 |
HIP 21176 |
12.00 |
| 2026-08-12 00:00 |
04:33:40.59 |
+10:47:05.1 |
HIP 21266 |
16.09 |
| 2026-08-12 12:00 |
04:34:16.69 |
+10:49:01.3 |
HIP 21266 |
19.43 |
| 2026-08-13 00:00 |
04:34:52.67 |
+10:50:56.9 |
HIP 21266 |
25.69 |
| 2026-08-13 12:00 |
04:35:28.55 |
+10:52:51.8 |
HIP 21506 |
24.58 |
| 2026-08-14 00:00 |
04:36:04.30 |
+10:54:46.0 |
HIP 21506 |
16.26 |
| 2026-08-14 12:00 |
04:36:39.94 |
+10:56:39.7 |
HIP 21506 |
9.27 |
| 2026-08-15 00:00 |
04:37:15.47 |
+10:58:32.7 |
HIP 21506 |
8.23 |
| 2026-08-15 12:00 |
04:37:50.87 |
+11:00:25.2 |
HIP 21506 |
14.41 |
| 2026-08-16 00:00 |
04:38:26.16 |
+11:02:17.0 |
HIP 21676 |
13.24 |
| 2026-08-16 12:00 |
04:39:01.32 |
+11:04:08.2 |
HIP 21676 |
9.09 |
| 2026-08-17 00:00 |
04:39:36.36 |
+11:05:58.8 |
HIP 21684 |
10.96 |
| 2026-08-17 12:00 |
04:40:11.28 |
+11:07:48.9 |
HIP 21684 |
15.48 |
| 2026-08-18 00:00 |
04:40:46.07 |
+11:09:38.3 |
HIP 21684 |
22.61 |
| 2026-08-18 12:00 |
04:41:20.73 |
+11:11:27.2 |
HIP 21684 |
30.55 |
| 2026-08-19 00:00 |
04:41:55.27 |
+11:13:15.5 |
HIP 21983 |
23.87 |