C/2004 D1 (NEAT)
| Parameter |
Value |
| Designation |
C/2004 D1 (NEAT) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2006-02-10T18:19:51.231360Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:37Z |
| Obs used |
507 |
| NEO |
- |
| M1 |
8.500 |
| K1 |
8.000 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2005-11-18.0000000 |
| e |
1.00161667 |
| q (au) |
4.974589 |
| a (au) |
-3077.055898 |
| i (deg) |
45.537431 |
| Ω (om, deg) |
62.252904 |
| ω (w, deg) |
75.536768 |
| M (ma, deg) |
-0.000489 |
Magnitude
Scatter + Global Linear
$$
M_a = (3.833 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
3.833 |
| n |
6.000 |
| gf |
0.998 |
| gb |
-0.841 |
| k |
0.990 |
| δ90 |
9.998 |
| 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 |
17:46:56.97 |
-45:38:44.8 |
HIP 86934 |
14.50 |
| 2026-02-03 12:00 |
17:47:00.37 |
-45:39:01.3 |
HIP 86934 |
14.86 |
| 2026-02-04 00:00 |
17:47:03.74 |
-45:39:18.0 |
HIP 86934 |
15.24 |
| 2026-02-04 12:00 |
17:47:07.09 |
-45:39:34.7 |
HIP 86934 |
15.63 |
| 2026-02-05 00:00 |
17:47:10.41 |
-45:39:51.6 |
HIP 86934 |
16.03 |
| 2026-02-05 12:00 |
17:47:13.69 |
-45:40:08.5 |
HIP 86934 |
16.45 |
| 2026-02-06 00:00 |
17:47:16.95 |
-45:40:25.5 |
HIP 86934 |
16.87 |
| 2026-02-06 12:00 |
17:47:20.18 |
-45:40:42.7 |
HIP 86934 |
17.29 |
| 2026-02-07 00:00 |
17:47:23.39 |
-45:41:00.0 |
HIP 86934 |
17.73 |
| 2026-02-07 12:00 |
17:47:26.56 |
-45:41:17.2 |
HIP 86934 |
18.17 |
| 2026-02-08 00:00 |
17:47:29.70 |
-45:41:34.6 |
HIP 86934 |
18.62 |
| 2026-02-08 12:00 |
17:47:32.81 |
-45:41:52.1 |
HIP 86934 |
19.07 |
| 2026-02-09 00:00 |
17:47:35.89 |
-45:42:09.7 |
HIP 86934 |
19.52 |
| 2026-02-09 12:00 |
17:47:38.95 |
-45:42:27.4 |
HIP 87241 |
19.87 |
| 2026-02-10 00:00 |
17:47:41.97 |
-45:42:45.2 |
HIP 87241 |
19.39 |
| 2026-02-10 12:00 |
17:47:44.96 |
-45:43:03.0 |
HIP 87241 |
18.92 |
| 2026-02-11 00:00 |
17:47:47.92 |
-45:43:20.9 |
HIP 87241 |
18.47 |
| 2026-02-11 12:00 |
17:47:50.85 |
-45:43:39.0 |
HIP 87241 |
18.03 |
| 2026-02-12 00:00 |
17:47:53.75 |
-45:43:57.1 |
HIP 87241 |
17.60 |
| 2026-02-12 12:00 |
17:47:56.61 |
-45:44:15.3 |
HIP 87241 |
17.19 |
| 2026-02-13 00:00 |
17:47:59.45 |
-45:44:33.5 |
HIP 87241 |
16.80 |
| 2026-02-13 12:00 |
17:48:02.25 |
-45:44:51.9 |
HIP 87241 |
16.42 |
| 2026-02-14 00:00 |
17:48:05.02 |
-45:45:10.3 |
HIP 87241 |
16.06 |
| 2026-02-14 12:00 |
17:48:07.76 |
-45:45:28.8 |
HIP 87241 |
15.72 |
| 2026-02-15 00:00 |
17:48:10.46 |
-45:45:47.4 |
HIP 87241 |
15.40 |
| 2026-02-15 12:00 |
17:48:13.13 |
-45:46:06.1 |
HIP 87241 |
15.10 |
| 2026-02-16 00:00 |
17:48:15.77 |
-45:46:24.8 |
HIP 87241 |
14.82 |
| 2026-02-16 12:00 |
17:48:18.38 |
-45:46:43.7 |
HIP 87241 |
14.56 |
| 2026-02-17 00:00 |
17:48:20.95 |
-45:47:02.6 |
HIP 87241 |
14.32 |
| 2026-02-17 12:00 |
17:48:23.49 |
-45:47:21.5 |
HIP 87241 |
14.11 |
| 2026-02-18 00:00 |
17:48:25.99 |
-45:47:40.6 |
HIP 87241 |
13.92 |
| 2026-02-18 12:00 |
17:48:28.46 |
-45:47:59.7 |
HIP 87241 |
13.75 |
| 2026-02-19 00:00 |
17:48:30.90 |
-45:48:18.8 |
HIP 87241 |
13.61 |
| 2026-02-19 12:00 |
17:48:33.30 |
-45:48:38.1 |
HIP 87241 |
13.50 |
| 2026-02-20 00:00 |
17:48:35.66 |
-45:48:57.4 |
HIP 87241 |
13.41 |
| 2026-02-20 12:00 |
17:48:38.00 |
-45:49:16.8 |
HIP 87241 |
13.34 |
| 2026-02-21 00:00 |
17:48:40.29 |
-45:49:36.2 |
HIP 87241 |
13.30 |
| 2026-02-21 12:00 |
17:48:42.55 |
-45:49:55.7 |
HIP 87241 |
13.28 |
| 2026-02-22 00:00 |
17:48:44.78 |
-45:50:15.3 |
HIP 87241 |
13.29 |
| 2026-02-22 12:00 |
17:48:46.97 |
-45:50:35.0 |
HIP 87241 |
13.32 |
| 2026-02-23 00:00 |
17:48:49.13 |
-45:50:54.6 |
HIP 87241 |
13.38 |
| 2026-02-23 12:00 |
17:48:51.25 |
-45:51:14.4 |
HIP 87241 |
13.46 |
| 2026-02-24 00:00 |
17:48:53.33 |
-45:51:34.2 |
HIP 87241 |
13.56 |