| 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) |
| 2026-03-26 00:00 |
01:27:19.31 |
-06:11:55.4 |
HIP 6763 |
10.07 |
| 2026-03-26 12:00 |
01:27:56.66 |
-06:06:52.9 |
HIP 6763 |
19.67 |
| 2026-03-27 00:00 |
01:28:34.06 |
-06:01:50.8 |
HIP 6912 |
20.93 |
| 2026-03-27 12:00 |
01:29:11.52 |
-05:56:49.0 |
HIP 6912 |
14.97 |
| 2026-03-28 00:00 |
01:29:49.04 |
-05:51:47.5 |
HIP 6912 |
15.33 |
| 2026-03-28 12:00 |
01:30:26.61 |
-05:46:46.3 |
HIP 6984 |
13.73 |
| 2026-03-29 00:00 |
01:31:04.24 |
-05:41:45.5 |
HIP 7070 |
9.22 |
| 2026-03-29 12:00 |
01:31:41.92 |
-05:36:44.9 |
HIP 7070 |
9.33 |
| 2026-03-30 00:00 |
01:32:19.66 |
-05:31:44.8 |
HIP 7070 |
17.77 |
| 2026-03-30 12:00 |
01:32:57.45 |
-05:26:44.9 |
HIP 7070 |
27.78 |
| 2026-03-31 00:00 |
01:33:35.29 |
-05:21:45.4 |
HIP 7427 |
35.65 |
| 2026-03-31 12:00 |
01:34:13.19 |
-05:16:46.3 |
HIP 7427 |
24.98 |
| 2026-04-01 00:00 |
01:34:51.14 |
-05:11:47.5 |
HIP 7427 |
14.30 |
| 2026-04-01 12:00 |
01:35:29.14 |
-05:06:49.0 |
HIP 7427 |
3.65 |
| 2026-04-02 00:00 |
01:36:07.19 |
-05:01:50.9 |
HIP 7427 |
7.12 |
| 2026-04-02 12:00 |
01:36:45.30 |
-04:56:53.2 |
HIP 7427 |
17.82 |
| 2026-04-03 00:00 |
01:37:23.46 |
-04:51:55.8 |
HIP 7659 |
19.57 |
| 2026-04-03 12:00 |
01:38:01.67 |
-04:46:58.7 |
HIP 7659 |
14.46 |
| 2026-04-04 00:00 |
01:38:39.93 |
-04:42:02.1 |
HIP 7659 |
16.29 |
| 2026-04-04 12:00 |
01:39:18.24 |
-04:37:05.8 |
HIP 7802 |
18.75 |
| 2026-04-05 00:00 |
01:39:56.60 |
-04:32:09.8 |
HIP 7802 |
8.02 |
| 2026-04-05 12:00 |
01:40:35.01 |
-04:27:14.3 |
HIP 7802 |
2.92 |
| 2026-04-06 00:00 |
01:41:13.48 |
-04:22:19.1 |
HIP 7802 |
13.60 |
| 2026-04-06 12:00 |
01:41:51.99 |
-04:17:24.3 |
HIP 7831 |
24.12 |
| 2026-04-07 00:00 |
01:42:30.55 |
-04:12:29.9 |
HIP 7999 |
31.26 |
| 2026-04-07 12:00 |
01:43:09.16 |
-04:07:35.8 |
HIP 7999 |
26.96 |
| 2026-04-08 00:00 |
01:43:47.83 |
-04:02:42.2 |
HIP 7999 |
26.66 |
| 2026-04-08 12:00 |
01:44:26.54 |
-03:57:49.0 |
HIP 8227 |
27.74 |
| 2026-04-09 00:00 |
01:45:05.29 |
-03:52:56.1 |
HIP 8227 |
24.55 |
| 2026-04-09 12:00 |
01:45:44.10 |
-03:48:03.7 |
HIP 8227 |
25.88 |
| 2026-04-10 00:00 |
01:46:22.95 |
-03:43:11.7 |
HIP 8227 |
31.16 |
| 2026-04-10 12:00 |
01:47:01.85 |
-03:38:20.0 |
HIP 8349 |
25.88 |
| 2026-04-11 00:00 |
01:47:40.80 |
-03:33:28.8 |
HIP 8349 |
19.22 |
| 2026-04-11 12:00 |
01:48:19.80 |
-03:28:38.1 |
HIP 8349 |
17.47 |
| 2026-04-12 00:00 |
01:48:58.84 |
-03:23:47.7 |
HIP 8349 |
21.86 |
| 2026-04-12 12:00 |
01:49:37.93 |
-03:18:57.8 |
HIP 8566 |
26.11 |
| 2026-04-13 00:00 |
01:50:17.06 |
-03:14:08.3 |
HIP 8566 |
27.71 |
| 2026-04-13 12:00 |
01:50:56.24 |
-03:09:19.2 |
HIP 8720 |
28.06 |
| 2026-04-14 00:00 |
01:51:35.46 |
-03:04:30.6 |
HIP 8720 |
18.45 |
| 2026-04-14 12:00 |
01:52:14.73 |
-02:59:42.5 |
HIP 8720 |
11.49 |
| 2026-04-15 00:00 |
01:52:54.04 |
-02:54:54.7 |
HIP 8720 |
12.74 |
| 2026-04-15 12:00 |
01:53:33.40 |
-02:50:07.5 |
HIP 8720 |
20.78 |
| 2026-04-16 00:00 |
01:54:12.80 |
-02:45:20.7 |
HIP 8720 |
30.67 |