| Parameter |
Value |
| Designation |
C/1996 E1 (NEAT) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1996-07-27T08:19:31.935360Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:49Z |
| Obs used |
237 |
| NEO |
- |
| M1 |
12.500 |
| K1 |
8.750 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1996-05-17.0000000 |
| e |
1.00090859 |
| q (au) |
1.358954 |
| a (au) |
-1495.676752 |
| i (deg) |
114.475378 |
| Ω (om, deg) |
149.841392 |
| ω (w, deg) |
81.108042 |
| M (ma, deg) |
-0.001216 |
Magnitude
Scatter + Global Linear
$$
M_a = (8.349 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
8.349 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.500 |
| k |
1.000 |
| 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 |
21:05:29.23 |
-74:24:18.2 |
HIP 103786 |
15.44 |
| 2026-09-20 12:00 |
21:05:23.46 |
-74:24:03.2 |
HIP 103786 |
15.17 |
| 2026-09-21 00:00 |
21:05:17.74 |
-74:23:47.9 |
HIP 103786 |
14.91 |
| 2026-09-21 12:00 |
21:05:12.07 |
-74:23:32.5 |
HIP 103786 |
14.66 |
| 2026-09-22 00:00 |
21:05:06.45 |
-74:23:16.8 |
HIP 103786 |
14.43 |
| 2026-09-22 12:00 |
21:05:00.89 |
-74:23:00.9 |
HIP 103786 |
14.22 |
| 2026-09-23 00:00 |
21:04:55.37 |
-74:22:44.8 |
HIP 103786 |
14.02 |
| 2026-09-23 12:00 |
21:04:49.92 |
-74:22:28.6 |
HIP 103786 |
13.84 |
| 2026-09-24 00:00 |
21:04:44.51 |
-74:22:12.1 |
HIP 103786 |
13.68 |
| 2026-09-24 12:00 |
21:04:39.16 |
-74:21:55.4 |
HIP 103786 |
13.53 |
| 2026-09-25 00:00 |
21:04:33.86 |
-74:21:38.5 |
HIP 103786 |
13.40 |
| 2026-09-25 12:00 |
21:04:28.62 |
-74:21:21.5 |
HIP 103786 |
13.30 |
| 2026-09-26 00:00 |
21:04:23.43 |
-74:21:04.2 |
HIP 103786 |
13.21 |
| 2026-09-26 12:00 |
21:04:18.30 |
-74:20:46.7 |
HIP 103786 |
13.14 |
| 2026-09-27 00:00 |
21:04:13.23 |
-74:20:29.1 |
HIP 103786 |
13.09 |
| 2026-09-27 12:00 |
21:04:08.21 |
-74:20:11.2 |
HIP 103786 |
13.06 |
| 2026-09-28 00:00 |
21:04:03.24 |
-74:19:53.2 |
HIP 103786 |
13.05 |
| 2026-09-28 12:00 |
21:03:58.33 |
-74:19:34.9 |
HIP 103786 |
13.06 |
| 2026-09-29 00:00 |
21:03:53.49 |
-74:19:16.5 |
HIP 103786 |
13.10 |
| 2026-09-29 12:00 |
21:03:48.69 |
-74:18:57.9 |
HIP 103786 |
13.15 |
| 2026-09-30 00:00 |
21:03:43.96 |
-74:18:39.1 |
HIP 103786 |
13.22 |
| 2026-09-30 12:00 |
21:03:39.28 |
-74:18:20.2 |
HIP 103786 |
13.31 |
| 2026-10-01 00:00 |
21:03:34.66 |
-74:18:01.0 |
HIP 103786 |
13.42 |
| 2026-10-01 12:00 |
21:03:30.10 |
-74:17:41.7 |
HIP 103786 |
13.54 |
| 2026-10-02 00:00 |
21:03:25.60 |
-74:17:22.2 |
HIP 103786 |
13.69 |
| 2026-10-02 12:00 |
21:03:21.16 |
-74:17:02.5 |
HIP 103786 |
13.85 |
| 2026-10-03 00:00 |
21:03:16.78 |
-74:16:42.6 |
HIP 103786 |
14.03 |
| 2026-10-03 12:00 |
21:03:12.46 |
-74:16:22.6 |
HIP 103786 |
14.22 |
| 2026-10-04 00:00 |
21:03:08.20 |
-74:16:02.4 |
HIP 103786 |
14.43 |
| 2026-10-04 12:00 |
21:03:04.00 |
-74:15:42.0 |
HIP 103786 |
14.66 |
| 2026-10-05 00:00 |
21:02:59.86 |
-74:15:21.5 |
HIP 103786 |
14.89 |
| 2026-10-05 12:00 |
21:02:55.78 |
-74:15:00.8 |
HIP 103786 |
15.14 |
| 2026-10-06 00:00 |
21:02:51.77 |
-74:14:39.9 |
HIP 103786 |
15.40 |
| 2026-10-06 12:00 |
21:02:47.81 |
-74:14:18.9 |
HIP 103786 |
15.68 |
| 2026-10-07 00:00 |
21:02:43.92 |
-74:13:57.7 |
HIP 103786 |
15.96 |
| 2026-10-07 12:00 |
21:02:40.09 |
-74:13:36.3 |
HIP 103786 |
16.26 |
| 2026-10-08 00:00 |
21:02:36.33 |
-74:13:14.8 |
HIP 103786 |
16.56 |
| 2026-10-08 12:00 |
21:02:32.62 |
-74:12:53.1 |
HIP 103786 |
16.88 |
| 2026-10-09 00:00 |
21:02:28.98 |
-74:12:31.3 |
HIP 103786 |
17.20 |
| 2026-10-09 12:00 |
21:02:25.41 |
-74:12:09.3 |
HIP 103786 |
17.53 |
| 2026-10-10 00:00 |
21:02:21.90 |
-74:11:47.2 |
HIP 103786 |
17.87 |
| 2026-10-10 12:00 |
21:02:18.45 |
-74:11:25.0 |
HIP 103786 |
18.21 |
| 2026-10-11 00:00 |
21:02:15.07 |
-74:11:02.5 |
HIP 103786 |
18.56 |