| 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) |
| 2026-03-26 00:00 |
16:51:36.53 |
-05:33:08.3 |
HIP 82537 |
17.16 |
| 2026-03-26 12:00 |
16:51:35.81 |
-05:32:56.8 |
HIP 82537 |
17.42 |
| 2026-03-27 00:00 |
16:51:35.06 |
-05:32:45.3 |
HIP 82537 |
17.68 |
| 2026-03-27 12:00 |
16:51:34.29 |
-05:32:33.7 |
HIP 82537 |
17.95 |
| 2026-03-28 00:00 |
16:51:33.49 |
-05:32:22.2 |
HIP 82537 |
18.22 |
| 2026-03-28 12:00 |
16:51:32.68 |
-05:32:10.6 |
HIP 82537 |
18.49 |
| 2026-03-29 00:00 |
16:51:31.84 |
-05:31:59.1 |
HIP 82537 |
18.77 |
| 2026-03-29 12:00 |
16:51:30.97 |
-05:31:47.5 |
HIP 82537 |
19.05 |
| 2026-03-30 00:00 |
16:51:30.09 |
-05:31:36.0 |
HIP 82537 |
19.34 |
| 2026-03-30 12:00 |
16:51:29.18 |
-05:31:24.5 |
HIP 82537 |
19.63 |
| 2026-03-31 00:00 |
16:51:28.25 |
-05:31:12.9 |
HIP 82537 |
19.92 |
| 2026-03-31 12:00 |
16:51:27.29 |
-05:31:01.4 |
HIP 82537 |
20.21 |
| 2026-04-01 00:00 |
16:51:26.31 |
-05:30:49.9 |
HIP 82537 |
20.51 |
| 2026-04-01 12:00 |
16:51:25.32 |
-05:30:38.4 |
HIP 82537 |
20.81 |
| 2026-04-02 00:00 |
16:51:24.30 |
-05:30:26.9 |
HIP 82537 |
21.12 |
| 2026-04-02 12:00 |
16:51:23.25 |
-05:30:15.4 |
HIP 82537 |
21.43 |
| 2026-04-03 00:00 |
16:51:22.19 |
-05:30:04.0 |
HIP 82537 |
21.74 |
| 2026-04-03 12:00 |
16:51:21.10 |
-05:29:52.5 |
HIP 82537 |
22.06 |
| 2026-04-04 00:00 |
16:51:19.99 |
-05:29:41.0 |
HIP 82537 |
22.38 |
| 2026-04-04 12:00 |
16:51:18.86 |
-05:29:29.6 |
HIP 82537 |
22.70 |
| 2026-04-05 00:00 |
16:51:17.71 |
-05:29:18.2 |
HIP 82537 |
23.03 |
| 2026-04-05 12:00 |
16:51:16.53 |
-05:29:06.8 |
HIP 82537 |
23.36 |
| 2026-04-06 00:00 |
16:51:15.34 |
-05:28:55.4 |
HIP 82537 |
23.69 |
| 2026-04-06 12:00 |
16:51:14.12 |
-05:28:44.0 |
HIP 82537 |
24.03 |
| 2026-04-07 00:00 |
16:51:12.88 |
-05:28:32.7 |
HIP 82537 |
24.37 |
| 2026-04-07 12:00 |
16:51:11.62 |
-05:28:21.4 |
HIP 82537 |
24.72 |
| 2026-04-08 00:00 |
16:51:10.34 |
-05:28:10.1 |
HIP 82537 |
25.07 |
| 2026-04-08 12:00 |
16:51:09.04 |
-05:27:58.8 |
HIP 82537 |
25.42 |
| 2026-04-09 00:00 |
16:51:07.72 |
-05:27:47.5 |
HIP 82537 |
25.78 |
| 2026-04-09 12:00 |
16:51:06.38 |
-05:27:36.3 |
HIP 82537 |
26.14 |
| 2026-04-10 00:00 |
16:51:05.01 |
-05:27:25.0 |
HIP 82537 |
26.50 |
| 2026-04-10 12:00 |
16:51:03.63 |
-05:27:13.9 |
HIP 82537 |
26.87 |
| 2026-04-11 00:00 |
16:51:02.23 |
-05:27:02.7 |
HIP 82537 |
27.24 |
| 2026-04-11 12:00 |
16:51:00.80 |
-05:26:51.6 |
HIP 82537 |
27.61 |
| 2026-04-12 00:00 |
16:50:59.36 |
-05:26:40.5 |
HIP 82537 |
27.99 |
| 2026-04-12 12:00 |
16:50:57.89 |
-05:26:29.4 |
HIP 82537 |
28.38 |
| 2026-04-13 00:00 |
16:50:56.41 |
-05:26:18.3 |
HIP 82537 |
28.76 |
| 2026-04-13 12:00 |
16:50:54.90 |
-05:26:07.3 |
HIP 82537 |
29.15 |
| 2026-04-14 00:00 |
16:50:53.38 |
-05:25:56.3 |
HIP 82558 |
29.47 |
| 2026-04-14 12:00 |
16:50:51.84 |
-05:25:45.4 |
HIP 82558 |
29.68 |
| 2026-04-15 00:00 |
16:50:50.27 |
-05:25:34.5 |
HIP 82558 |
29.90 |
| 2026-04-15 12:00 |
16:50:48.69 |
-05:25:23.6 |
HIP 82558 |
30.13 |
| 2026-04-16 00:00 |
16:50:47.09 |
-05:25:12.8 |
HIP 82558 |
30.37 |