C/1996 E1 (NEAT)
| 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) |
| 2026-02-03 00:00 |
21:15:19.70 |
-72:34:49.5 |
HIP 104597 |
18.02 |
| 2026-02-03 12:00 |
21:15:26.86 |
-72:34:43.6 |
HIP 104597 |
18.55 |
| 2026-02-04 00:00 |
21:15:34.03 |
-72:34:38.0 |
HIP 104597 |
19.07 |
| 2026-02-04 12:00 |
21:15:41.20 |
-72:34:32.6 |
HIP 104597 |
19.60 |
| 2026-02-05 00:00 |
21:15:48.36 |
-72:34:27.4 |
HIP 104597 |
20.12 |
| 2026-02-05 12:00 |
21:15:55.53 |
-72:34:22.4 |
HIP 105045 |
20.18 |
| 2026-02-06 00:00 |
21:16:02.70 |
-72:34:17.7 |
HIP 105045 |
20.03 |
| 2026-02-06 12:00 |
21:16:09.86 |
-72:34:13.2 |
HIP 105045 |
19.89 |
| 2026-02-07 00:00 |
21:16:17.03 |
-72:34:09.0 |
HIP 105045 |
19.77 |
| 2026-02-07 12:00 |
21:16:24.19 |
-72:34:04.9 |
HIP 105045 |
19.66 |
| 2026-02-08 00:00 |
21:16:31.35 |
-72:34:01.1 |
HIP 105045 |
19.58 |
| 2026-02-08 12:00 |
21:16:38.50 |
-72:33:57.6 |
HIP 105045 |
19.51 |
| 2026-02-09 00:00 |
21:16:45.66 |
-72:33:54.2 |
HIP 105045 |
19.46 |
| 2026-02-09 12:00 |
21:16:52.81 |
-72:33:51.1 |
HIP 105045 |
19.44 |
| 2026-02-10 00:00 |
21:16:59.95 |
-72:33:48.3 |
HIP 105045 |
19.43 |
| 2026-02-10 12:00 |
21:17:07.10 |
-72:33:45.7 |
HIP 105045 |
19.44 |
| 2026-02-11 00:00 |
21:17:14.23 |
-72:33:43.3 |
HIP 105045 |
19.46 |
| 2026-02-11 12:00 |
21:17:21.36 |
-72:33:41.1 |
HIP 105045 |
19.51 |
| 2026-02-12 00:00 |
21:17:28.49 |
-72:33:39.2 |
HIP 105045 |
19.58 |
| 2026-02-12 12:00 |
21:17:35.61 |
-72:33:37.5 |
HIP 105045 |
19.66 |
| 2026-02-13 00:00 |
21:17:42.72 |
-72:33:36.1 |
HIP 105045 |
19.76 |
| 2026-02-13 12:00 |
21:17:49.82 |
-72:33:34.8 |
HIP 105045 |
19.88 |
| 2026-02-14 00:00 |
21:17:56.92 |
-72:33:33.9 |
HIP 105045 |
20.02 |
| 2026-02-14 12:00 |
21:18:04.01 |
-72:33:33.1 |
HIP 105045 |
20.17 |
| 2026-02-15 00:00 |
21:18:11.09 |
-72:33:32.6 |
HIP 105045 |
20.35 |
| 2026-02-15 12:00 |
21:18:18.16 |
-72:33:32.4 |
HIP 105045 |
20.53 |
| 2026-02-16 00:00 |
21:18:25.22 |
-72:33:32.4 |
HIP 105045 |
20.73 |
| 2026-02-16 12:00 |
21:18:32.27 |
-72:33:32.6 |
HIP 105045 |
20.95 |
| 2026-02-17 00:00 |
21:18:39.30 |
-72:33:33.0 |
HIP 105045 |
21.18 |
| 2026-02-17 12:00 |
21:18:46.33 |
-72:33:33.7 |
HIP 105045 |
21.43 |
| 2026-02-18 00:00 |
21:18:53.35 |
-72:33:34.7 |
HIP 105045 |
21.69 |
| 2026-02-18 12:00 |
21:19:00.35 |
-72:33:35.8 |
HIP 105045 |
21.96 |
| 2026-02-19 00:00 |
21:19:07.34 |
-72:33:37.2 |
HIP 105045 |
22.24 |
| 2026-02-19 12:00 |
21:19:14.32 |
-72:33:38.9 |
HIP 105045 |
22.54 |
| 2026-02-20 00:00 |
21:19:21.29 |
-72:33:40.8 |
HIP 105045 |
22.84 |
| 2026-02-20 12:00 |
21:19:28.24 |
-72:33:42.9 |
HIP 105045 |
23.16 |
| 2026-02-21 00:00 |
21:19:35.17 |
-72:33:45.3 |
HIP 105045 |
23.49 |
| 2026-02-21 12:00 |
21:19:42.09 |
-72:33:47.9 |
HIP 105045 |
23.82 |
| 2026-02-22 00:00 |
21:19:49.00 |
-72:33:50.7 |
HIP 105045 |
24.17 |
| 2026-02-22 12:00 |
21:19:55.89 |
-72:33:53.8 |
HIP 105045 |
24.52 |
| 2026-02-23 00:00 |
21:20:02.76 |
-72:33:57.1 |
HIP 105781 |
24.13 |
| 2026-02-23 12:00 |
21:20:09.62 |
-72:34:00.6 |
HIP 105781 |
23.61 |
| 2026-02-24 00:00 |
21:20:16.45 |
-72:34:04.4 |
HIP 105781 |
23.10 |