| Parameter |
Value |
| Designation |
204P/LINEAR-NEAT |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2015-12-11T12:45:33.013440Z |
| Orbit solution date (soln_date, UTC) |
2024-05-07T15:48:38Z |
| Obs used |
1273 |
| NEO |
- |
| M1 |
15.300 |
| K1 |
7.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2014-11-28.0000000 |
| e |
0.47217310 |
| q (au) |
1.929928 |
| a (au) |
3.656366 |
| i (deg) |
6.588859 |
| Ω (om, deg) |
109.072895 |
| ω (w, deg) |
355.047711 |
| M (ma, deg) |
306.638046 |
Magnitude
Scatter + Global Linear
$$
M_a = (13.380 + 4.629\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
13.380 |
| n |
4.629 |
| gf |
1.000 |
| gb |
-0.796 |
| 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) |
| 2026-09-20 00:00 |
19:01:38.01 |
-23:27:02.4 |
HIP 93405 |
13.73 |
| 2026-09-20 12:00 |
19:01:38.58 |
-23:27:10.3 |
HIP 93405 |
13.89 |
| 2026-09-21 00:00 |
19:01:39.36 |
-23:27:17.8 |
HIP 93405 |
14.06 |
| 2026-09-21 12:00 |
19:01:40.35 |
-23:27:25.0 |
HIP 93405 |
14.23 |
| 2026-09-22 00:00 |
19:01:41.56 |
-23:27:31.8 |
HIP 93405 |
14.41 |
| 2026-09-22 12:00 |
19:01:42.97 |
-23:27:38.3 |
HIP 93508 |
14.44 |
| 2026-09-23 00:00 |
19:01:44.59 |
-23:27:44.4 |
HIP 93508 |
14.06 |
| 2026-09-23 12:00 |
19:01:46.42 |
-23:27:50.2 |
HIP 93508 |
13.65 |
| 2026-09-24 00:00 |
19:01:48.45 |
-23:27:55.7 |
HIP 93508 |
13.21 |
| 2026-09-24 12:00 |
19:01:50.69 |
-23:28:00.8 |
HIP 93508 |
12.72 |
| 2026-09-25 00:00 |
19:01:53.14 |
-23:28:05.5 |
HIP 93508 |
12.21 |
| 2026-09-25 12:00 |
19:01:55.80 |
-23:28:10.0 |
HIP 93508 |
11.66 |
| 2026-09-26 00:00 |
19:01:58.66 |
-23:28:14.1 |
HIP 93508 |
11.09 |
| 2026-09-26 12:00 |
19:02:01.72 |
-23:28:17.8 |
HIP 93508 |
10.49 |
| 2026-09-27 00:00 |
19:02:04.99 |
-23:28:21.3 |
HIP 93508 |
9.87 |
| 2026-09-27 12:00 |
19:02:08.46 |
-23:28:24.3 |
HIP 93508 |
9.24 |
| 2026-09-28 00:00 |
19:02:12.13 |
-23:28:27.1 |
HIP 93508 |
8.62 |
| 2026-09-28 12:00 |
19:02:16.01 |
-23:28:29.5 |
HIP 93508 |
8.01 |
| 2026-09-29 00:00 |
19:02:20.09 |
-23:28:31.6 |
HIP 93508 |
7.43 |
| 2026-09-29 12:00 |
19:02:24.37 |
-23:28:33.3 |
HIP 93508 |
6.92 |
| 2026-09-30 00:00 |
19:02:28.85 |
-23:28:34.7 |
HIP 93508 |
6.50 |
| 2026-09-30 12:00 |
19:02:33.53 |
-23:28:35.8 |
HIP 93508 |
6.23 |
| 2026-10-01 00:00 |
19:02:38.41 |
-23:28:36.6 |
HIP 93508 |
6.15 |
| 2026-10-01 12:00 |
19:02:43.49 |
-23:28:37.0 |
HIP 93508 |
6.28 |
| 2026-10-02 00:00 |
19:02:48.77 |
-23:28:37.1 |
HIP 93508 |
6.63 |
| 2026-10-02 12:00 |
19:02:54.25 |
-23:28:36.8 |
HIP 93508 |
7.21 |
| 2026-10-03 00:00 |
19:02:59.92 |
-23:28:36.2 |
HIP 93508 |
7.97 |
| 2026-10-03 12:00 |
19:03:05.79 |
-23:28:35.3 |
HIP 93508 |
8.90 |
| 2026-10-04 00:00 |
19:03:11.86 |
-23:28:34.0 |
HIP 93508 |
9.97 |
| 2026-10-04 12:00 |
19:03:18.12 |
-23:28:32.5 |
HIP 93508 |
11.14 |
| 2026-10-05 00:00 |
19:03:24.58 |
-23:28:30.5 |
HIP 93508 |
12.41 |
| 2026-10-05 12:00 |
19:03:31.24 |
-23:28:28.3 |
HIP 93508 |
13.77 |
| 2026-10-06 00:00 |
19:03:38.08 |
-23:28:25.7 |
HIP 93508 |
15.20 |
| 2026-10-06 12:00 |
19:03:45.13 |
-23:28:22.7 |
HIP 93508 |
16.70 |
| 2026-10-07 00:00 |
19:03:52.36 |
-23:28:19.5 |
HIP 93508 |
18.27 |
| 2026-10-07 12:00 |
19:03:59.79 |
-23:28:15.9 |
HIP 93508 |
19.89 |
| 2026-10-08 00:00 |
19:04:07.40 |
-23:28:11.9 |
HIP 93508 |
21.57 |
| 2026-10-08 12:00 |
19:04:15.21 |
-23:28:07.7 |
HIP 93508 |
23.30 |
| 2026-10-09 00:00 |
19:04:23.21 |
-23:28:03.0 |
HIP 93508 |
25.08 |
| 2026-10-09 12:00 |
19:04:31.40 |
-23:27:58.1 |
HIP 93508 |
26.92 |
| 2026-10-10 00:00 |
19:04:39.78 |
-23:27:52.8 |
HIP 93832 |
28.76 |
| 2026-10-10 12:00 |
19:04:48.34 |
-23:27:47.2 |
HIP 93832 |
26.97 |
| 2026-10-11 00:00 |
19:04:57.09 |
-23:27:41.2 |
HIP 93832 |
25.16 |