| 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 |
-0.734 |
| 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) |
| 2026-03-26 00:00 |
08:14:49.14 |
-60:04:25.0 |
HIP 40172 |
19.26 |
| 2026-03-26 12:00 |
08:14:47.29 |
-60:03:55.3 |
HIP 40172 |
18.98 |
| 2026-03-27 00:00 |
08:14:45.49 |
-60:03:25.4 |
HIP 40172 |
18.73 |
| 2026-03-27 12:00 |
08:14:43.71 |
-60:02:55.4 |
HIP 40172 |
18.49 |
| 2026-03-28 00:00 |
08:14:41.97 |
-60:02:25.4 |
HIP 40172 |
18.26 |
| 2026-03-28 12:00 |
08:14:40.26 |
-60:01:55.2 |
HIP 40172 |
18.06 |
| 2026-03-29 00:00 |
08:14:38.59 |
-60:01:24.9 |
HIP 40172 |
17.87 |
| 2026-03-29 12:00 |
08:14:36.95 |
-60:00:54.6 |
HIP 40172 |
17.70 |
| 2026-03-30 00:00 |
08:14:35.35 |
-60:00:24.1 |
HIP 40172 |
17.55 |
| 2026-03-30 12:00 |
08:14:33.78 |
-59:59:53.6 |
HIP 40172 |
17.43 |
| 2026-03-31 00:00 |
08:14:32.24 |
-59:59:22.9 |
HIP 40172 |
17.32 |
| 2026-03-31 12:00 |
08:14:30.74 |
-59:58:52.2 |
HIP 40172 |
17.23 |
| 2026-04-01 00:00 |
08:14:29.28 |
-59:58:21.4 |
HIP 40172 |
17.17 |
| 2026-04-01 12:00 |
08:14:27.85 |
-59:57:50.5 |
HIP 40172 |
17.12 |
| 2026-04-02 00:00 |
08:14:26.45 |
-59:57:19.5 |
HIP 40172 |
17.10 |
| 2026-04-02 12:00 |
08:14:25.09 |
-59:56:48.5 |
HIP 40172 |
17.10 |
| 2026-04-03 00:00 |
08:14:23.76 |
-59:56:17.3 |
HIP 40172 |
17.13 |
| 2026-04-03 12:00 |
08:14:22.47 |
-59:55:46.1 |
HIP 40172 |
17.17 |
| 2026-04-04 00:00 |
08:14:21.21 |
-59:55:14.8 |
HIP 40172 |
17.24 |
| 2026-04-04 12:00 |
08:14:19.99 |
-59:54:43.5 |
HIP 40172 |
17.32 |
| 2026-04-05 00:00 |
08:14:18.80 |
-59:54:12.1 |
HIP 40172 |
17.43 |
| 2026-04-05 12:00 |
08:14:17.65 |
-59:53:40.6 |
HIP 40418 |
17.11 |
| 2026-04-06 00:00 |
08:14:16.54 |
-59:53:09.0 |
HIP 40418 |
16.67 |
| 2026-04-06 12:00 |
08:14:15.45 |
-59:52:37.4 |
HIP 40418 |
16.23 |
| 2026-04-07 00:00 |
08:14:14.41 |
-59:52:05.8 |
HIP 40418 |
15.79 |
| 2026-04-07 12:00 |
08:14:13.40 |
-59:51:34.0 |
HIP 40418 |
15.36 |
| 2026-04-08 00:00 |
08:14:12.42 |
-59:51:02.3 |
HIP 40418 |
14.94 |
| 2026-04-08 12:00 |
08:14:11.48 |
-59:50:30.4 |
HIP 40418 |
14.52 |
| 2026-04-09 00:00 |
08:14:10.58 |
-59:49:58.5 |
HIP 40418 |
14.10 |
| 2026-04-09 12:00 |
08:14:09.71 |
-59:49:26.6 |
HIP 40418 |
13.69 |
| 2026-04-10 00:00 |
08:14:08.87 |
-59:48:54.6 |
HIP 40418 |
13.29 |
| 2026-04-10 12:00 |
08:14:08.08 |
-59:48:22.6 |
HIP 40418 |
12.90 |
| 2026-04-11 00:00 |
08:14:07.31 |
-59:47:50.6 |
HIP 40418 |
12.51 |
| 2026-04-11 12:00 |
08:14:06.59 |
-59:47:18.5 |
HIP 40418 |
12.13 |
| 2026-04-12 00:00 |
08:14:05.90 |
-59:46:46.4 |
HIP 40418 |
11.76 |
| 2026-04-12 12:00 |
08:14:05.24 |
-59:46:14.2 |
HIP 40418 |
11.41 |
| 2026-04-13 00:00 |
08:14:04.62 |
-59:45:42.0 |
HIP 40418 |
11.06 |
| 2026-04-13 12:00 |
08:14:04.04 |
-59:45:09.8 |
HIP 40418 |
10.73 |
| 2026-04-14 00:00 |
08:14:03.49 |
-59:44:37.6 |
HIP 40418 |
10.41 |
| 2026-04-14 12:00 |
08:14:02.98 |
-59:44:05.3 |
HIP 40418 |
10.10 |
| 2026-04-15 00:00 |
08:14:02.50 |
-59:43:33.0 |
HIP 40418 |
9.82 |
| 2026-04-15 12:00 |
08:14:02.06 |
-59:43:00.7 |
HIP 40418 |
9.55 |
| 2026-04-16 00:00 |
08:14:01.66 |
-59:42:28.4 |
HIP 40418 |
9.30 |