| Parameter |
Value |
| Designation |
108P/Ciffreo |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2021-10-11T05:28:33.585600Z |
| Orbit solution date (soln_date, UTC) |
2022-08-16T21:15:23Z |
| Obs used |
2301 |
| NEO |
- |
| M1 |
10.900 |
| K1 |
19.500 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2018-05-19.0000000 |
| e |
0.58101345 |
| q (au) |
1.526125 |
| a (au) |
3.642420 |
| i (deg) |
13.980156 |
| Ω (om, deg) |
52.402395 |
| ω (w, deg) |
356.861707 |
| M (ma, deg) |
184.017042 |
Magnitude
Scatter + Global Linear
$$
M_a = (11.226 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
11.226 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.500 |
| 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 |
16:32:42.29 |
-24:15:59.5 |
HIP 81097 |
15.74 |
| 2026-03-26 12:00 |
16:32:39.06 |
-24:16:25.6 |
HIP 81097 |
16.44 |
| 2026-03-27 00:00 |
16:32:35.63 |
-24:16:51.3 |
HIP 81097 |
17.20 |
| 2026-03-27 12:00 |
16:32:31.99 |
-24:17:16.6 |
HIP 81097 |
18.02 |
| 2026-03-28 00:00 |
16:32:28.13 |
-24:17:41.6 |
HIP 81097 |
18.90 |
| 2026-03-28 12:00 |
16:32:24.08 |
-24:18:06.1 |
HIP 81097 |
19.83 |
| 2026-03-29 00:00 |
16:32:19.81 |
-24:18:30.3 |
HIP 81097 |
20.82 |
| 2026-03-29 12:00 |
16:32:15.34 |
-24:18:54.1 |
HIP 81097 |
21.86 |
| 2026-03-30 00:00 |
16:32:10.66 |
-24:19:17.5 |
HIP 81097 |
22.95 |
| 2026-03-30 12:00 |
16:32:05.77 |
-24:19:40.5 |
HIP 81097 |
24.10 |
| 2026-03-31 00:00 |
16:32:00.68 |
-24:20:03.1 |
HIP 81097 |
25.29 |
| 2026-03-31 12:00 |
16:31:55.38 |
-24:20:25.4 |
HIP 81097 |
26.53 |
| 2026-04-01 00:00 |
16:31:49.87 |
-24:20:47.2 |
HIP 81097 |
27.81 |
| 2026-04-01 12:00 |
16:31:44.16 |
-24:21:08.6 |
HIP 81097 |
29.15 |
| 2026-04-02 00:00 |
16:31:38.24 |
-24:21:29.6 |
HIP 81097 |
30.53 |
| 2026-04-02 12:00 |
16:31:32.11 |
-24:21:50.3 |
HIP 81097 |
31.96 |
| 2026-04-03 00:00 |
16:31:25.78 |
-24:22:10.5 |
HIP 81097 |
33.44 |
| 2026-04-03 12:00 |
16:31:19.24 |
-24:22:30.3 |
HIP 80736 |
33.36 |
| 2026-04-04 00:00 |
16:31:12.50 |
-24:22:49.6 |
HIP 80736 |
31.80 |
| 2026-04-04 12:00 |
16:31:05.55 |
-24:23:08.6 |
HIP 80736 |
30.19 |
| 2026-04-05 00:00 |
16:30:58.39 |
-24:23:27.2 |
HIP 80736 |
28.55 |
| 2026-04-05 12:00 |
16:30:51.03 |
-24:23:45.3 |
HIP 80736 |
26.86 |
| 2026-04-06 00:00 |
16:30:43.46 |
-24:24:03.0 |
HIP 80736 |
25.13 |
| 2026-04-06 12:00 |
16:30:35.69 |
-24:24:20.2 |
HIP 80736 |
23.37 |
| 2026-04-07 00:00 |
16:30:27.72 |
-24:24:37.1 |
HIP 80736 |
21.57 |
| 2026-04-07 12:00 |
16:30:19.54 |
-24:24:53.5 |
HIP 80736 |
19.74 |
| 2026-04-08 00:00 |
16:30:11.16 |
-24:25:09.4 |
HIP 80736 |
17.88 |
| 2026-04-08 12:00 |
16:30:02.58 |
-24:25:25.0 |
HIP 80736 |
15.99 |
| 2026-04-09 00:00 |
16:29:53.79 |
-24:25:40.0 |
HIP 80736 |
14.09 |
| 2026-04-09 12:00 |
16:29:44.80 |
-24:25:54.7 |
HIP 80736 |
12.19 |
| 2026-04-10 00:00 |
16:29:35.61 |
-24:26:08.8 |
HIP 80736 |
10.32 |
| 2026-04-10 12:00 |
16:29:26.22 |
-24:26:22.6 |
HIP 80736 |
8.53 |
| 2026-04-11 00:00 |
16:29:16.63 |
-24:26:35.8 |
HIP 80736 |
6.93 |
| 2026-04-11 12:00 |
16:29:06.84 |
-24:26:48.7 |
HIP 80736 |
5.72 |
| 2026-04-12 00:00 |
16:28:56.85 |
-24:27:01.0 |
HIP 80736 |
5.26 |
| 2026-04-12 12:00 |
16:28:46.66 |
-24:27:12.9 |
HIP 80736 |
5.77 |
| 2026-04-13 00:00 |
16:28:36.28 |
-24:27:24.3 |
HIP 80736 |
7.09 |
| 2026-04-13 12:00 |
16:28:25.70 |
-24:27:35.3 |
HIP 80736 |
8.91 |
| 2026-04-14 00:00 |
16:28:14.92 |
-24:27:45.8 |
HIP 80736 |
11.00 |
| 2026-04-14 12:00 |
16:28:03.95 |
-24:27:55.8 |
HIP 80736 |
13.26 |
| 2026-04-15 00:00 |
16:27:52.79 |
-24:28:05.3 |
HIP 80736 |
15.64 |
| 2026-04-15 12:00 |
16:27:41.43 |
-24:28:14.4 |
HIP 80736 |
18.11 |
| 2026-04-16 00:00 |
16:27:29.88 |
-24:28:22.9 |
HIP 80736 |
20.65 |