C/2000 A1 (Montani)
| Parameter |
Value |
| Designation |
C/2000 A1 (Montani) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2000-07-13T05:54:09.682560Z |
| Orbit solution date (soln_date, UTC) |
2025-09-09T12:42:30Z |
| Obs used |
135 |
| NEO |
- |
| M1 |
4.400 |
| K1 |
10.000 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2000-07-31.0000000 |
| e |
1.00401459 |
| q (au) |
9.743100 |
| a (au) |
-2426.925294 |
| i (deg) |
24.541886 |
| Ω (om, deg) |
111.835138 |
| ω (w, deg) |
14.271337 |
| M (ma, deg) |
0.000146 |
Magnitude
Scatter + Global Linear
$$
M_a = (8.448 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
8.448 |
| n |
2.000 |
| gf |
0.995 |
| gb |
-0.505 |
| k |
1.000 |
| δ90 |
9.999 |
| 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 |
16:50:42.53 |
-05:49:32.4 |
HIP 82537 |
23.18 |
| 2026-02-03 12:00 |
16:50:44.26 |
-05:49:26.1 |
HIP 82537 |
22.75 |
| 2026-02-04 00:00 |
16:50:45.95 |
-05:49:19.8 |
HIP 82537 |
22.32 |
| 2026-02-04 12:00 |
16:50:47.63 |
-05:49:13.4 |
HIP 82537 |
21.89 |
| 2026-02-05 00:00 |
16:50:49.29 |
-05:49:06.8 |
HIP 82537 |
21.47 |
| 2026-02-05 12:00 |
16:50:50.92 |
-05:49:00.2 |
HIP 82537 |
21.06 |
| 2026-02-06 00:00 |
16:50:52.54 |
-05:48:53.5 |
HIP 82537 |
20.65 |
| 2026-02-06 12:00 |
16:50:54.13 |
-05:48:46.7 |
HIP 82537 |
20.25 |
| 2026-02-07 00:00 |
16:50:55.70 |
-05:48:39.8 |
HIP 82537 |
19.85 |
| 2026-02-07 12:00 |
16:50:57.25 |
-05:48:32.9 |
HIP 82537 |
19.46 |
| 2026-02-08 00:00 |
16:50:58.77 |
-05:48:25.8 |
HIP 82537 |
19.07 |
| 2026-02-08 12:00 |
16:51:00.28 |
-05:48:18.6 |
HIP 82537 |
18.69 |
| 2026-02-09 00:00 |
16:51:01.76 |
-05:48:11.4 |
HIP 82537 |
18.32 |
| 2026-02-09 12:00 |
16:51:03.22 |
-05:48:04.1 |
HIP 82537 |
17.95 |
| 2026-02-10 00:00 |
16:51:04.65 |
-05:47:56.7 |
HIP 82537 |
17.59 |
| 2026-02-10 12:00 |
16:51:06.07 |
-05:47:49.2 |
HIP 82537 |
17.23 |
| 2026-02-11 00:00 |
16:51:07.46 |
-05:47:41.6 |
HIP 82537 |
16.88 |
| 2026-02-11 12:00 |
16:51:08.83 |
-05:47:33.9 |
HIP 82537 |
16.54 |
| 2026-02-12 00:00 |
16:51:10.17 |
-05:47:26.2 |
HIP 82537 |
16.20 |
| 2026-02-12 12:00 |
16:51:11.50 |
-05:47:18.4 |
HIP 82537 |
15.87 |
| 2026-02-13 00:00 |
16:51:12.80 |
-05:47:10.5 |
HIP 82537 |
15.55 |
| 2026-02-13 12:00 |
16:51:14.07 |
-05:47:02.5 |
HIP 82537 |
15.24 |
| 2026-02-14 00:00 |
16:51:15.33 |
-05:46:54.4 |
HIP 82537 |
14.93 |
| 2026-02-14 12:00 |
16:51:16.55 |
-05:46:46.3 |
HIP 82537 |
14.63 |
| 2026-02-15 00:00 |
16:51:17.76 |
-05:46:38.0 |
HIP 82537 |
14.33 |
| 2026-02-15 12:00 |
16:51:18.94 |
-05:46:29.7 |
HIP 82537 |
14.05 |
| 2026-02-16 00:00 |
16:51:20.10 |
-05:46:21.4 |
HIP 82537 |
13.77 |
| 2026-02-16 12:00 |
16:51:21.24 |
-05:46:12.9 |
HIP 82537 |
13.50 |
| 2026-02-17 00:00 |
16:51:22.35 |
-05:46:04.4 |
HIP 82537 |
13.23 |
| 2026-02-17 12:00 |
16:51:23.44 |
-05:45:55.8 |
HIP 82537 |
12.98 |
| 2026-02-18 00:00 |
16:51:24.50 |
-05:45:47.1 |
HIP 82537 |
12.73 |
| 2026-02-18 12:00 |
16:51:25.54 |
-05:45:38.3 |
HIP 82537 |
12.50 |
| 2026-02-19 00:00 |
16:51:26.56 |
-05:45:29.5 |
HIP 82537 |
12.27 |
| 2026-02-19 12:00 |
16:51:27.55 |
-05:45:20.6 |
HIP 82537 |
12.05 |
| 2026-02-20 00:00 |
16:51:28.51 |
-05:45:11.7 |
HIP 82537 |
11.84 |
| 2026-02-20 12:00 |
16:51:29.46 |
-05:45:02.6 |
HIP 82537 |
11.63 |
| 2026-02-21 00:00 |
16:51:30.38 |
-05:44:53.5 |
HIP 82537 |
11.44 |
| 2026-02-21 12:00 |
16:51:31.27 |
-05:44:44.4 |
HIP 82537 |
11.26 |
| 2026-02-22 00:00 |
16:51:32.14 |
-05:44:35.1 |
HIP 82537 |
11.08 |
| 2026-02-22 12:00 |
16:51:32.99 |
-05:44:25.8 |
HIP 82537 |
10.92 |
| 2026-02-23 00:00 |
16:51:33.81 |
-05:44:16.5 |
HIP 82537 |
10.77 |
| 2026-02-23 12:00 |
16:51:34.60 |
-05:44:07.0 |
HIP 82537 |
10.62 |
| 2026-02-24 00:00 |
16:51:35.38 |
-05:43:57.6 |
HIP 82537 |
10.49 |