| 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) |
| 2026-07-29 00:00 |
08:22:35.48 |
-58:34:11.4 |
HIP 41054 |
1.12 |
| 2026-07-29 12:00 |
08:22:39.44 |
-58:34:13.8 |
HIP 41054 |
1.20 |
| 2026-07-30 00:00 |
08:22:43.40 |
-58:34:16.5 |
HIP 41054 |
1.47 |
| 2026-07-30 12:00 |
08:22:47.36 |
-58:34:19.4 |
HIP 41054 |
1.85 |
| 2026-07-31 00:00 |
08:22:51.31 |
-58:34:22.6 |
HIP 41054 |
2.29 |
| 2026-07-31 12:00 |
08:22:55.26 |
-58:34:26.0 |
HIP 41054 |
2.76 |
| 2026-08-01 00:00 |
08:22:59.21 |
-58:34:29.6 |
HIP 41054 |
3.24 |
| 2026-08-01 12:00 |
08:23:03.16 |
-58:34:33.6 |
HIP 41054 |
3.74 |
| 2026-08-02 00:00 |
08:23:07.10 |
-58:34:37.7 |
HIP 41054 |
4.24 |
| 2026-08-02 12:00 |
08:23:11.04 |
-58:34:42.1 |
HIP 41054 |
4.75 |
| 2026-08-03 00:00 |
08:23:14.98 |
-58:34:46.8 |
HIP 41054 |
5.26 |
| 2026-08-03 12:00 |
08:23:18.91 |
-58:34:51.7 |
HIP 41054 |
5.77 |
| 2026-08-04 00:00 |
08:23:22.84 |
-58:34:56.9 |
HIP 41054 |
6.28 |
| 2026-08-04 12:00 |
08:23:26.77 |
-58:35:02.3 |
HIP 41054 |
6.80 |
| 2026-08-05 00:00 |
08:23:30.68 |
-58:35:07.9 |
HIP 41054 |
7.32 |
| 2026-08-05 12:00 |
08:23:34.60 |
-58:35:13.8 |
HIP 41054 |
7.83 |
| 2026-08-06 00:00 |
08:23:38.51 |
-58:35:20.0 |
HIP 41054 |
8.35 |
| 2026-08-06 12:00 |
08:23:42.41 |
-58:35:26.4 |
HIP 41054 |
8.87 |
| 2026-08-07 00:00 |
08:23:46.31 |
-58:35:33.0 |
HIP 41054 |
9.39 |
| 2026-08-07 12:00 |
08:23:50.20 |
-58:35:39.9 |
HIP 41054 |
9.91 |
| 2026-08-08 00:00 |
08:23:54.09 |
-58:35:47.1 |
HIP 41054 |
10.43 |
| 2026-08-08 12:00 |
08:23:57.97 |
-58:35:54.4 |
HIP 41054 |
10.95 |
| 2026-08-09 00:00 |
08:24:01.84 |
-58:36:02.1 |
HIP 41054 |
11.47 |
| 2026-08-09 12:00 |
08:24:05.71 |
-58:36:09.9 |
HIP 41054 |
11.99 |
| 2026-08-10 00:00 |
08:24:09.57 |
-58:36:18.0 |
HIP 41238 |
12.39 |
| 2026-08-10 12:00 |
08:24:13.42 |
-58:36:26.4 |
HIP 41238 |
12.30 |
| 2026-08-11 00:00 |
08:24:17.26 |
-58:36:35.0 |
HIP 41238 |
12.23 |
| 2026-08-11 12:00 |
08:24:21.10 |
-58:36:43.8 |
HIP 41238 |
12.18 |
| 2026-08-12 00:00 |
08:24:24.92 |
-58:36:52.9 |
HIP 41238 |
12.17 |
| 2026-08-12 12:00 |
08:24:28.74 |
-58:37:02.2 |
HIP 41238 |
12.18 |
| 2026-08-13 00:00 |
08:24:32.55 |
-58:37:11.8 |
HIP 41238 |
12.21 |
| 2026-08-13 12:00 |
08:24:36.35 |
-58:37:21.6 |
HIP 41238 |
12.27 |
| 2026-08-14 00:00 |
08:24:40.15 |
-58:37:31.7 |
HIP 41238 |
12.36 |
| 2026-08-14 12:00 |
08:24:43.93 |
-58:37:42.0 |
HIP 41238 |
12.48 |
| 2026-08-15 00:00 |
08:24:47.70 |
-58:37:52.5 |
HIP 41238 |
12.61 |
| 2026-08-15 12:00 |
08:24:51.46 |
-58:38:03.2 |
HIP 41238 |
12.78 |
| 2026-08-16 00:00 |
08:24:55.21 |
-58:38:14.2 |
HIP 41238 |
12.96 |
| 2026-08-16 12:00 |
08:24:58.95 |
-58:38:25.5 |
HIP 41238 |
13.17 |
| 2026-08-17 00:00 |
08:25:02.68 |
-58:38:36.9 |
HIP 41238 |
13.40 |
| 2026-08-17 12:00 |
08:25:06.40 |
-58:38:48.6 |
HIP 41238 |
13.64 |
| 2026-08-18 00:00 |
08:25:10.11 |
-58:39:00.6 |
HIP 41416 |
13.71 |
| 2026-08-18 12:00 |
08:25:13.81 |
-58:39:12.7 |
HIP 41416 |
13.30 |
| 2026-08-19 00:00 |
08:25:17.49 |
-58:39:25.1 |
HIP 41416 |
12.90 |