| Parameter |
Value |
| Designation |
C/1992 N1 (Machholz) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1992-07-10T15:35:32.516160Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:44Z |
| Obs used |
9 |
| NEO |
- |
| M1 |
9.700 |
| K1 |
10.000 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1992-07-09.0000000 |
| e |
1.00462488 |
| q (au) |
0.819362 |
| a (au) |
-177.163937 |
| i (deg) |
57.567972 |
| Ω (om, deg) |
235.163990 |
| ω (w, deg) |
162.307854 |
| M (ma, deg) |
-0.000690 |
Magnitude
Scatter + Global Linear
$$
M_a = (9.642 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
9.642 |
| n |
2.000 |
| gf |
0.997 |
| gb |
-1.000 |
| 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) |
| 2026-09-20 00:00 |
13:31:09.75 |
-37:57:55.4 |
HIP 65980 |
23.08 |
| 2026-09-20 12:00 |
13:31:11.84 |
-37:57:57.3 |
HIP 65980 |
23.01 |
| 2026-09-21 00:00 |
13:31:13.93 |
-37:57:59.4 |
HIP 65980 |
22.95 |
| 2026-09-21 12:00 |
13:31:16.04 |
-37:58:01.5 |
HIP 65980 |
22.90 |
| 2026-09-22 00:00 |
13:31:18.15 |
-37:58:03.8 |
HIP 65980 |
22.86 |
| 2026-09-22 12:00 |
13:31:20.27 |
-37:58:06.3 |
HIP 65980 |
22.83 |
| 2026-09-23 00:00 |
13:31:22.40 |
-37:58:08.9 |
HIP 65980 |
22.81 |
| 2026-09-23 12:00 |
13:31:24.54 |
-37:58:11.6 |
HIP 65980 |
22.79 |
| 2026-09-24 00:00 |
13:31:26.68 |
-37:58:14.4 |
HIP 65980 |
22.79 |
| 2026-09-24 12:00 |
13:31:28.83 |
-37:58:17.4 |
HIP 65980 |
22.80 |
| 2026-09-25 00:00 |
13:31:30.99 |
-37:58:20.6 |
HIP 65980 |
22.82 |
| 2026-09-25 12:00 |
13:31:33.16 |
-37:58:23.8 |
HIP 65980 |
22.85 |
| 2026-09-26 00:00 |
13:31:35.33 |
-37:58:27.2 |
HIP 65980 |
22.89 |
| 2026-09-26 12:00 |
13:31:37.51 |
-37:58:30.8 |
HIP 65980 |
22.94 |
| 2026-09-27 00:00 |
13:31:39.70 |
-37:58:34.4 |
HIP 65980 |
23.00 |
| 2026-09-27 12:00 |
13:31:41.90 |
-37:58:38.2 |
HIP 65980 |
23.07 |
| 2026-09-28 00:00 |
13:31:44.10 |
-37:58:42.2 |
HIP 65980 |
23.15 |
| 2026-09-28 12:00 |
13:31:46.30 |
-37:58:46.3 |
HIP 65980 |
23.24 |
| 2026-09-29 00:00 |
13:31:48.52 |
-37:58:50.5 |
HIP 65980 |
23.34 |
| 2026-09-29 12:00 |
13:31:50.74 |
-37:58:54.8 |
HIP 65980 |
23.46 |
| 2026-09-30 00:00 |
13:31:52.96 |
-37:58:59.3 |
HIP 65980 |
23.58 |
| 2026-09-30 12:00 |
13:31:55.19 |
-37:59:03.9 |
HIP 65980 |
23.71 |
| 2026-10-01 00:00 |
13:31:57.43 |
-37:59:08.7 |
HIP 65980 |
23.85 |
| 2026-10-01 12:00 |
13:31:59.67 |
-37:59:13.6 |
HIP 65980 |
24.00 |
| 2026-10-02 00:00 |
13:32:01.92 |
-37:59:18.6 |
HIP 65980 |
24.17 |
| 2026-10-02 12:00 |
13:32:04.17 |
-37:59:23.7 |
HIP 65980 |
24.34 |
| 2026-10-03 00:00 |
13:32:06.43 |
-37:59:29.0 |
HIP 66019 |
24.44 |
| 2026-10-03 12:00 |
13:32:08.70 |
-37:59:34.4 |
HIP 66019 |
24.36 |
| 2026-10-04 00:00 |
13:32:10.97 |
-37:59:40.0 |
HIP 66019 |
24.28 |
| 2026-10-04 12:00 |
13:32:13.24 |
-37:59:45.7 |
HIP 66163 |
23.95 |
| 2026-10-05 00:00 |
13:32:15.52 |
-37:59:51.5 |
HIP 66163 |
23.55 |
| 2026-10-05 12:00 |
13:32:17.80 |
-37:59:57.4 |
HIP 66163 |
23.15 |
| 2026-10-06 00:00 |
13:32:20.09 |
-38:00:03.5 |
HIP 66163 |
22.75 |
| 2026-10-06 12:00 |
13:32:22.38 |
-38:00:09.7 |
HIP 66163 |
22.35 |
| 2026-10-07 00:00 |
13:32:24.67 |
-38:00:16.0 |
HIP 66163 |
21.95 |
| 2026-10-07 12:00 |
13:32:26.97 |
-38:00:22.5 |
HIP 66163 |
21.55 |
| 2026-10-08 00:00 |
13:32:29.27 |
-38:00:29.1 |
HIP 66163 |
21.15 |
| 2026-10-08 12:00 |
13:32:31.58 |
-38:00:35.8 |
HIP 66163 |
20.75 |
| 2026-10-09 00:00 |
13:32:33.89 |
-38:00:42.7 |
HIP 66163 |
20.36 |
| 2026-10-09 12:00 |
13:32:36.20 |
-38:00:49.6 |
HIP 66163 |
19.96 |
| 2026-10-10 00:00 |
13:32:38.52 |
-38:00:56.7 |
HIP 66163 |
19.57 |
| 2026-10-10 12:00 |
13:32:40.83 |
-38:01:04.0 |
HIP 66163 |
19.17 |
| 2026-10-11 00:00 |
13:32:43.16 |
-38:01:11.3 |
HIP 66163 |
18.78 |