| Parameter |
Value |
| Designation |
C/1994 N1 (Nakamura-Nishimura-Machholz) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1994-07-12T22:33:27.740160Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:47Z |
| Obs used |
305 |
| NEO |
- |
| M1 |
11.300 |
| K1 |
12.500 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1994-08-10.0000000 |
| e |
1.00000419 |
| q (au) |
1.140140 |
| a (au) |
-272260.819970 |
| i (deg) |
94.378024 |
| Ω (om, deg) |
158.912250 |
| ω (w, deg) |
123.071914 |
| M (ma, deg) |
0.000000 |
Magnitude
Scatter + Global Linear
$$
M_a = (7.704 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
7.704 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.733 |
| k |
0.998 |
| 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 |
08:28:38.45 |
-58:59:49.5 |
HIP 41720 |
18.95 |
| 2026-09-20 12:00 |
08:28:40.89 |
-59:00:14.5 |
HIP 41720 |
18.43 |
| 2026-09-21 00:00 |
08:28:43.30 |
-59:00:39.6 |
HIP 41720 |
17.92 |
| 2026-09-21 12:00 |
08:28:45.69 |
-59:01:04.9 |
HIP 41720 |
17.41 |
| 2026-09-22 00:00 |
08:28:48.05 |
-59:01:30.3 |
HIP 41720 |
16.90 |
| 2026-09-22 12:00 |
08:28:50.38 |
-59:01:55.9 |
HIP 41720 |
16.39 |
| 2026-09-23 00:00 |
08:28:52.69 |
-59:02:21.5 |
HIP 41720 |
15.88 |
| 2026-09-23 12:00 |
08:28:54.97 |
-59:02:47.4 |
HIP 41720 |
15.38 |
| 2026-09-24 00:00 |
08:28:57.22 |
-59:03:13.3 |
HIP 41720 |
14.88 |
| 2026-09-24 12:00 |
08:28:59.44 |
-59:03:39.4 |
HIP 41720 |
14.38 |
| 2026-09-25 00:00 |
08:29:01.64 |
-59:04:05.6 |
HIP 41720 |
13.88 |
| 2026-09-25 12:00 |
08:29:03.81 |
-59:04:32.0 |
HIP 41720 |
13.39 |
| 2026-09-26 00:00 |
08:29:05.95 |
-59:04:58.5 |
HIP 41720 |
12.90 |
| 2026-09-26 12:00 |
08:29:08.07 |
-59:05:25.1 |
HIP 41720 |
12.42 |
| 2026-09-27 00:00 |
08:29:10.15 |
-59:05:51.8 |
HIP 41720 |
11.94 |
| 2026-09-27 12:00 |
08:29:12.21 |
-59:06:18.7 |
HIP 41720 |
11.46 |
| 2026-09-28 00:00 |
08:29:14.24 |
-59:06:45.6 |
HIP 41720 |
10.99 |
| 2026-09-28 12:00 |
08:29:16.24 |
-59:07:12.7 |
HIP 41720 |
10.53 |
| 2026-09-29 00:00 |
08:29:18.21 |
-59:07:39.9 |
HIP 41720 |
10.08 |
| 2026-09-29 12:00 |
08:29:20.16 |
-59:08:07.3 |
HIP 41720 |
9.63 |
| 2026-09-30 00:00 |
08:29:22.07 |
-59:08:34.7 |
HIP 41720 |
9.20 |
| 2026-09-30 12:00 |
08:29:23.96 |
-59:09:02.3 |
HIP 41720 |
8.78 |
| 2026-10-01 00:00 |
08:29:25.81 |
-59:09:29.9 |
HIP 41720 |
8.37 |
| 2026-10-01 12:00 |
08:29:27.64 |
-59:09:57.7 |
HIP 41720 |
7.97 |
| 2026-10-02 00:00 |
08:29:29.44 |
-59:10:25.6 |
HIP 41720 |
7.60 |
| 2026-10-02 12:00 |
08:29:31.21 |
-59:10:53.6 |
HIP 41720 |
7.24 |
| 2026-10-03 00:00 |
08:29:32.94 |
-59:11:21.7 |
HIP 41720 |
6.91 |
| 2026-10-03 12:00 |
08:29:34.65 |
-59:11:49.9 |
HIP 41720 |
6.61 |
| 2026-10-04 00:00 |
08:29:36.33 |
-59:12:18.2 |
HIP 41720 |
6.34 |
| 2026-10-04 12:00 |
08:29:37.97 |
-59:12:46.6 |
HIP 41720 |
6.11 |
| 2026-10-05 00:00 |
08:29:39.59 |
-59:13:15.1 |
HIP 41720 |
5.91 |
| 2026-10-05 12:00 |
08:29:41.18 |
-59:13:43.7 |
HIP 41720 |
5.76 |
| 2026-10-06 00:00 |
08:29:42.73 |
-59:14:12.3 |
HIP 41720 |
5.66 |
| 2026-10-06 12:00 |
08:29:44.25 |
-59:14:41.1 |
HIP 41720 |
5.61 |
| 2026-10-07 00:00 |
08:29:45.74 |
-59:15:10.0 |
HIP 41720 |
5.61 |
| 2026-10-07 12:00 |
08:29:47.20 |
-59:15:38.9 |
HIP 41720 |
5.66 |
| 2026-10-08 00:00 |
08:29:48.63 |
-59:16:07.9 |
HIP 41720 |
5.77 |
| 2026-10-08 12:00 |
08:29:50.03 |
-59:16:37.0 |
HIP 41720 |
5.92 |
| 2026-10-09 00:00 |
08:29:51.39 |
-59:17:06.2 |
HIP 41720 |
6.11 |
| 2026-10-09 12:00 |
08:29:52.73 |
-59:17:35.5 |
HIP 41720 |
6.35 |
| 2026-10-10 00:00 |
08:29:54.03 |
-59:18:04.8 |
HIP 41720 |
6.62 |
| 2026-10-10 12:00 |
08:29:55.30 |
-59:18:34.3 |
HIP 41720 |
6.92 |
| 2026-10-11 00:00 |
08:29:56.53 |
-59:19:03.7 |
HIP 41720 |
7.25 |