C/2000 J1 (Ferris)
| Parameter |
Value |
| Designation |
C/2000 J1 (Ferris) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2000-05-11T07:12:19.716480Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:04Z |
| Obs used |
24 |
| NEO |
- |
| M1 |
14.200 |
| K1 |
10.000 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2000-05-11.0000000 |
| e |
0.95426363 |
| q (au) |
2.542550 |
| a (au) |
55.591420 |
| i (deg) |
98.794665 |
| Ω (om, deg) |
28.440310 |
| ω (w, deg) |
147.219674 |
| M (ma, deg) |
359.999286 |
Magnitude
Scatter + Global Linear
$$
M_a = (18.720 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
18.720 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.872 |
| k |
0.800 |
| 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) |
| 2026-02-03 00:00 |
03:40:18.96 |
-36:45:19.2 |
HIP 16998 |
20.88 |
| 2026-02-03 12:00 |
03:40:18.03 |
-36:44:44.1 |
HIP 16998 |
20.58 |
| 2026-02-04 00:00 |
03:40:17.14 |
-36:44:08.8 |
HIP 16998 |
20.31 |
| 2026-02-04 12:00 |
03:40:16.28 |
-36:43:33.5 |
HIP 16998 |
20.05 |
| 2026-02-05 00:00 |
03:40:15.44 |
-36:42:58.1 |
HIP 16998 |
19.82 |
| 2026-02-05 12:00 |
03:40:14.64 |
-36:42:22.5 |
HIP 16998 |
19.60 |
| 2026-02-06 00:00 |
03:40:13.87 |
-36:41:46.9 |
HIP 16998 |
19.42 |
| 2026-02-06 12:00 |
03:40:13.12 |
-36:41:11.2 |
HIP 16998 |
19.25 |
| 2026-02-07 00:00 |
03:40:12.41 |
-36:40:35.3 |
HIP 16998 |
19.11 |
| 2026-02-07 12:00 |
03:40:11.73 |
-36:39:59.4 |
HIP 16998 |
18.99 |
| 2026-02-08 00:00 |
03:40:11.07 |
-36:39:23.4 |
HIP 16998 |
18.90 |
| 2026-02-08 12:00 |
03:40:10.45 |
-36:38:47.4 |
HIP 16998 |
18.84 |
| 2026-02-09 00:00 |
03:40:09.86 |
-36:38:11.2 |
HIP 16998 |
18.80 |
| 2026-02-09 12:00 |
03:40:09.30 |
-36:37:35.0 |
HIP 16998 |
18.79 |
| 2026-02-10 00:00 |
03:40:08.76 |
-36:36:58.7 |
HIP 16998 |
18.80 |
| 2026-02-10 12:00 |
03:40:08.26 |
-36:36:22.3 |
HIP 16998 |
18.84 |
| 2026-02-11 00:00 |
03:40:07.79 |
-36:35:45.8 |
HIP 16998 |
18.90 |
| 2026-02-11 12:00 |
03:40:07.35 |
-36:35:09.3 |
HIP 16998 |
19.00 |
| 2026-02-12 00:00 |
03:40:06.93 |
-36:34:32.7 |
HIP 16998 |
19.11 |
| 2026-02-12 12:00 |
03:40:06.55 |
-36:33:56.1 |
HIP 16998 |
19.25 |
| 2026-02-13 00:00 |
03:40:06.20 |
-36:33:19.4 |
HIP 16998 |
19.42 |
| 2026-02-13 12:00 |
03:40:05.88 |
-36:32:42.6 |
HIP 16998 |
19.61 |
| 2026-02-14 00:00 |
03:40:05.59 |
-36:32:05.8 |
HIP 16998 |
19.82 |
| 2026-02-14 12:00 |
03:40:05.33 |
-36:31:28.9 |
HIP 16998 |
20.06 |
| 2026-02-15 00:00 |
03:40:05.10 |
-36:30:52.0 |
HIP 16998 |
20.32 |
| 2026-02-15 12:00 |
03:40:04.90 |
-36:30:15.1 |
HIP 16998 |
20.59 |
| 2026-02-16 00:00 |
03:40:04.73 |
-36:29:38.1 |
HIP 16998 |
20.89 |
| 2026-02-16 12:00 |
03:40:04.59 |
-36:29:01.1 |
HIP 16998 |
21.21 |
| 2026-02-17 00:00 |
03:40:04.48 |
-36:28:24.0 |
HIP 16998 |
21.55 |
| 2026-02-17 12:00 |
03:40:04.39 |
-36:27:46.9 |
HIP 16998 |
21.90 |
| 2026-02-18 00:00 |
03:40:04.34 |
-36:27:09.8 |
HIP 16998 |
22.27 |
| 2026-02-18 12:00 |
03:40:04.32 |
-36:26:32.6 |
HIP 16998 |
22.65 |
| 2026-02-19 00:00 |
03:40:04.33 |
-36:25:55.4 |
HIP 16998 |
23.05 |
| 2026-02-19 12:00 |
03:40:04.37 |
-36:25:18.2 |
HIP 16998 |
23.47 |
| 2026-02-20 00:00 |
03:40:04.44 |
-36:24:41.0 |
HIP 16998 |
23.90 |
| 2026-02-20 12:00 |
03:40:04.54 |
-36:24:03.7 |
HIP 16981 |
24.27 |
| 2026-02-21 00:00 |
03:40:04.67 |
-36:23:26.5 |
HIP 16981 |
24.64 |
| 2026-02-21 12:00 |
03:40:04.83 |
-36:22:49.2 |
HIP 16981 |
25.03 |
| 2026-02-22 00:00 |
03:40:05.02 |
-36:22:12.0 |
HIP 16981 |
25.43 |
| 2026-02-22 12:00 |
03:40:05.24 |
-36:21:34.7 |
HIP 16981 |
25.84 |
| 2026-02-23 00:00 |
03:40:05.49 |
-36:20:57.4 |
HIP 17081 |
25.26 |
| 2026-02-23 12:00 |
03:40:05.76 |
-36:20:20.1 |
HIP 17081 |
24.67 |
| 2026-02-24 00:00 |
03:40:06.07 |
-36:19:42.9 |
HIP 17081 |
24.08 |