| 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) |
| 2026-06-01 00:00 |
13:29:47.94 |
-38:38:21.2 |
HIP 65829 |
7.78 |
| 2026-06-01 12:00 |
13:29:46.35 |
-38:38:03.9 |
HIP 65829 |
7.45 |
| 2026-06-02 00:00 |
13:29:44.78 |
-38:37:46.5 |
HIP 65829 |
7.13 |
| 2026-06-02 12:00 |
13:29:43.22 |
-38:37:29.2 |
HIP 65829 |
6.82 |
| 2026-06-03 00:00 |
13:29:41.67 |
-38:37:11.8 |
HIP 65829 |
6.52 |
| 2026-06-03 12:00 |
13:29:40.15 |
-38:36:54.4 |
HIP 65829 |
6.23 |
| 2026-06-04 00:00 |
13:29:38.63 |
-38:36:37.0 |
HIP 65829 |
5.96 |
| 2026-06-04 12:00 |
13:29:37.13 |
-38:36:19.6 |
HIP 65829 |
5.70 |
| 2026-06-05 00:00 |
13:29:35.65 |
-38:36:02.1 |
HIP 65829 |
5.46 |
| 2026-06-05 12:00 |
13:29:34.19 |
-38:35:44.7 |
HIP 65829 |
5.24 |
| 2026-06-06 00:00 |
13:29:32.73 |
-38:35:27.2 |
HIP 65829 |
5.05 |
| 2026-06-06 12:00 |
13:29:31.30 |
-38:35:09.7 |
HIP 65829 |
4.88 |
| 2026-06-07 00:00 |
13:29:29.88 |
-38:34:52.2 |
HIP 65829 |
4.74 |
| 2026-06-07 12:00 |
13:29:28.48 |
-38:34:34.7 |
HIP 65829 |
4.62 |
| 2026-06-08 00:00 |
13:29:27.09 |
-38:34:17.2 |
HIP 65829 |
4.54 |
| 2026-06-08 12:00 |
13:29:25.72 |
-38:33:59.6 |
HIP 65829 |
4.49 |
| 2026-06-09 00:00 |
13:29:24.36 |
-38:33:42.1 |
HIP 65829 |
4.47 |
| 2026-06-09 12:00 |
13:29:23.03 |
-38:33:24.5 |
HIP 65829 |
4.48 |
| 2026-06-10 00:00 |
13:29:21.70 |
-38:33:07.0 |
HIP 65829 |
4.52 |
| 2026-06-10 12:00 |
13:29:20.40 |
-38:32:49.5 |
HIP 65829 |
4.60 |
| 2026-06-11 00:00 |
13:29:19.11 |
-38:32:31.9 |
HIP 65829 |
4.70 |
| 2026-06-11 12:00 |
13:29:17.84 |
-38:32:14.4 |
HIP 65829 |
4.83 |
| 2026-06-12 00:00 |
13:29:16.58 |
-38:31:56.8 |
HIP 65829 |
4.98 |
| 2026-06-12 12:00 |
13:29:15.35 |
-38:31:39.3 |
HIP 65829 |
5.15 |
| 2026-06-13 00:00 |
13:29:14.13 |
-38:31:21.7 |
HIP 65829 |
5.34 |
| 2026-06-13 12:00 |
13:29:12.92 |
-38:31:04.2 |
HIP 65829 |
5.55 |
| 2026-06-14 00:00 |
13:29:11.74 |
-38:30:46.7 |
HIP 65829 |
5.76 |
| 2026-06-14 12:00 |
13:29:10.57 |
-38:30:29.1 |
HIP 65829 |
6.00 |
| 2026-06-15 00:00 |
13:29:09.42 |
-38:30:11.6 |
HIP 65829 |
6.24 |
| 2026-06-15 12:00 |
13:29:08.28 |
-38:29:54.1 |
HIP 65829 |
6.49 |
| 2026-06-16 00:00 |
13:29:07.17 |
-38:29:36.6 |
HIP 65829 |
6.74 |
| 2026-06-16 12:00 |
13:29:06.07 |
-38:29:19.2 |
HIP 65829 |
7.01 |
| 2026-06-17 00:00 |
13:29:04.99 |
-38:29:01.7 |
HIP 65829 |
7.28 |
| 2026-06-17 12:00 |
13:29:03.93 |
-38:28:44.3 |
HIP 65829 |
7.55 |
| 2026-06-18 00:00 |
13:29:02.88 |
-38:28:26.8 |
HIP 65829 |
7.82 |
| 2026-06-18 12:00 |
13:29:01.86 |
-38:28:09.4 |
HIP 65829 |
8.10 |
| 2026-06-19 00:00 |
13:29:00.85 |
-38:27:52.0 |
HIP 65829 |
8.38 |
| 2026-06-19 12:00 |
13:28:59.86 |
-38:27:34.7 |
HIP 65829 |
8.67 |
| 2026-06-20 00:00 |
13:28:58.89 |
-38:27:17.3 |
HIP 65829 |
8.95 |
| 2026-06-20 12:00 |
13:28:57.93 |
-38:27:00.0 |
HIP 65829 |
9.23 |
| 2026-06-21 00:00 |
13:28:57.00 |
-38:26:42.7 |
HIP 65829 |
9.52 |
| 2026-06-21 12:00 |
13:28:56.08 |
-38:26:25.5 |
HIP 65829 |
9.80 |
| 2026-06-22 00:00 |
13:28:55.18 |
-38:26:08.2 |
HIP 65829 |
10.09 |