| Parameter |
Value |
| Designation |
C/2007 W3 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2008-06-02T19:04:58.730880Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:15Z |
| Obs used |
206 |
| NEO |
- |
| M1 |
15.300 |
| K1 |
4.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2008-02-28.0000000 |
| e |
1.00016327 |
| q (au) |
1.776638 |
| a (au) |
-10881.860403 |
| i (deg) |
78.673550 |
| Ω (om, deg) |
73.069451 |
| ω (w, deg) |
112.625589 |
| M (ma, deg) |
-0.000083 |
Magnitude
Scatter + Global Linear
$$
M_a = (16.097 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
16.097 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.577 |
| k |
0.800 |
| 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) |
| 2026-07-29 00:00 |
04:13:50.33 |
-69:08:27.0 |
HIP 19706 |
3.13 |
| 2026-07-29 12:00 |
04:13:54.60 |
-69:09:06.0 |
HIP 19706 |
3.75 |
| 2026-07-30 00:00 |
04:13:58.81 |
-69:09:45.3 |
HIP 19706 |
4.42 |
| 2026-07-30 12:00 |
04:14:02.96 |
-69:10:24.7 |
HIP 19706 |
5.11 |
| 2026-07-31 00:00 |
04:14:07.05 |
-69:11:04.3 |
HIP 19706 |
5.81 |
| 2026-07-31 12:00 |
04:14:11.08 |
-69:11:44.1 |
HIP 19706 |
6.52 |
| 2026-08-01 00:00 |
04:14:15.04 |
-69:12:24.0 |
HIP 19706 |
7.24 |
| 2026-08-01 12:00 |
04:14:18.95 |
-69:13:04.2 |
HIP 19706 |
7.96 |
| 2026-08-02 00:00 |
04:14:22.79 |
-69:13:44.5 |
HIP 19706 |
8.68 |
| 2026-08-02 12:00 |
04:14:26.57 |
-69:14:24.9 |
HIP 19706 |
9.41 |
| 2026-08-03 00:00 |
04:14:30.28 |
-69:15:05.6 |
HIP 19706 |
10.14 |
| 2026-08-03 12:00 |
04:14:33.94 |
-69:15:46.4 |
HIP 19706 |
10.87 |
| 2026-08-04 00:00 |
04:14:37.53 |
-69:16:27.3 |
HIP 19706 |
11.61 |
| 2026-08-04 12:00 |
04:14:41.05 |
-69:17:08.5 |
HIP 19706 |
12.34 |
| 2026-08-05 00:00 |
04:14:44.51 |
-69:17:49.7 |
HIP 19706 |
13.08 |
| 2026-08-05 12:00 |
04:14:47.91 |
-69:18:31.2 |
HIP 19706 |
13.81 |
| 2026-08-06 00:00 |
04:14:51.24 |
-69:19:12.7 |
HIP 19776 |
13.72 |
| 2026-08-06 12:00 |
04:14:54.50 |
-69:19:54.5 |
HIP 19776 |
13.09 |
| 2026-08-07 00:00 |
04:14:57.70 |
-69:20:36.3 |
HIP 19776 |
12.47 |
| 2026-08-07 12:00 |
04:15:00.84 |
-69:21:18.3 |
HIP 19776 |
11.87 |
| 2026-08-08 00:00 |
04:15:03.90 |
-69:22:00.5 |
HIP 19776 |
11.27 |
| 2026-08-08 12:00 |
04:15:06.90 |
-69:22:42.8 |
HIP 19776 |
10.70 |
| 2026-08-09 00:00 |
04:15:09.83 |
-69:23:25.2 |
HIP 19776 |
10.14 |
| 2026-08-09 12:00 |
04:15:12.70 |
-69:24:07.7 |
HIP 19776 |
9.61 |
| 2026-08-10 00:00 |
04:15:15.50 |
-69:24:50.4 |
HIP 19776 |
9.10 |
| 2026-08-10 12:00 |
04:15:18.22 |
-69:25:33.2 |
HIP 19776 |
8.62 |
| 2026-08-11 00:00 |
04:15:20.88 |
-69:26:16.1 |
HIP 19776 |
8.17 |
| 2026-08-11 12:00 |
04:15:23.47 |
-69:26:59.2 |
HIP 19776 |
7.77 |
| 2026-08-12 00:00 |
04:15:25.99 |
-69:27:42.3 |
HIP 19776 |
7.42 |
| 2026-08-12 12:00 |
04:15:28.44 |
-69:28:25.6 |
HIP 19776 |
7.12 |
| 2026-08-13 00:00 |
04:15:30.82 |
-69:29:09.0 |
HIP 19776 |
6.89 |
| 2026-08-13 12:00 |
04:15:33.13 |
-69:29:52.4 |
HIP 19776 |
6.73 |
| 2026-08-14 00:00 |
04:15:35.37 |
-69:30:36.0 |
HIP 19776 |
6.64 |
| 2026-08-14 12:00 |
04:15:37.54 |
-69:31:19.7 |
HIP 19776 |
6.63 |
| 2026-08-15 00:00 |
04:15:39.63 |
-69:32:03.4 |
HIP 19776 |
6.69 |
| 2026-08-15 12:00 |
04:15:41.66 |
-69:32:47.3 |
HIP 19776 |
6.84 |
| 2026-08-16 00:00 |
04:15:43.61 |
-69:33:31.2 |
HIP 19776 |
7.05 |
| 2026-08-16 12:00 |
04:15:45.49 |
-69:34:15.2 |
HIP 19776 |
7.33 |
| 2026-08-17 00:00 |
04:15:47.30 |
-69:34:59.3 |
HIP 19776 |
7.67 |
| 2026-08-17 12:00 |
04:15:49.04 |
-69:35:43.5 |
HIP 19776 |
8.06 |
| 2026-08-18 00:00 |
04:15:50.70 |
-69:36:27.8 |
HIP 19776 |
8.49 |
| 2026-08-18 12:00 |
04:15:52.29 |
-69:37:12.1 |
HIP 19957 |
7.94 |
| 2026-08-19 00:00 |
04:15:53.81 |
-69:37:56.5 |
HIP 19957 |
7.27 |