| Parameter |
Value |
| Designation |
C/1998 W3 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1998-10-06T17:14:54.798720Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:57Z |
| Obs used |
162 |
| NEO |
- |
| M1 |
6.500 |
| K1 |
10.750 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1999-02-19.0000000 |
| e |
1.00089959 |
| q (au) |
4.914592 |
| a (au) |
-5463.131541 |
| i (deg) |
129.186877 |
| Ω (om, deg) |
123.916981 |
| ω (w, deg) |
6.886773 |
| M (ma, deg) |
0.000330 |
Magnitude
Scatter + Global Linear
$$
M_a = (2.412 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
2.412 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-1.000 |
| 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) |
| 2026-03-26 00:00 |
21:20:22.25 |
+08:42:48.5 |
HIP 105503 |
26.33 |
| 2026-03-26 12:00 |
21:20:23.82 |
+08:43:04.5 |
HIP 105503 |
25.90 |
| 2026-03-27 00:00 |
21:20:25.38 |
+08:43:20.6 |
HIP 105503 |
25.48 |
| 2026-03-27 12:00 |
21:20:26.92 |
+08:43:36.8 |
HIP 105503 |
25.06 |
| 2026-03-28 00:00 |
21:20:28.45 |
+08:43:52.9 |
HIP 105503 |
24.65 |
| 2026-03-28 12:00 |
21:20:29.96 |
+08:44:09.1 |
HIP 105503 |
24.25 |
| 2026-03-29 00:00 |
21:20:31.46 |
+08:44:25.2 |
HIP 105503 |
23.85 |
| 2026-03-29 12:00 |
21:20:32.94 |
+08:44:41.4 |
HIP 105503 |
23.45 |
| 2026-03-30 00:00 |
21:20:34.41 |
+08:44:57.7 |
HIP 105503 |
23.07 |
| 2026-03-30 12:00 |
21:20:35.86 |
+08:45:13.9 |
HIP 105503 |
22.69 |
| 2026-03-31 00:00 |
21:20:37.29 |
+08:45:30.1 |
HIP 105503 |
22.31 |
| 2026-03-31 12:00 |
21:20:38.71 |
+08:45:46.4 |
HIP 105503 |
21.95 |
| 2026-04-01 00:00 |
21:20:40.11 |
+08:46:02.7 |
HIP 105503 |
21.59 |
| 2026-04-01 12:00 |
21:20:41.50 |
+08:46:18.9 |
HIP 105503 |
21.23 |
| 2026-04-02 00:00 |
21:20:42.86 |
+08:46:35.2 |
HIP 105503 |
20.89 |
| 2026-04-02 12:00 |
21:20:44.22 |
+08:46:51.5 |
HIP 105503 |
20.55 |
| 2026-04-03 00:00 |
21:20:45.55 |
+08:47:07.8 |
HIP 105503 |
20.22 |
| 2026-04-03 12:00 |
21:20:46.87 |
+08:47:24.1 |
HIP 105503 |
19.89 |
| 2026-04-04 00:00 |
21:20:48.17 |
+08:47:40.4 |
HIP 105503 |
19.58 |
| 2026-04-04 12:00 |
21:20:49.46 |
+08:47:56.7 |
HIP 105503 |
19.27 |
| 2026-04-05 00:00 |
21:20:50.73 |
+08:48:13.0 |
HIP 105503 |
18.97 |
| 2026-04-05 12:00 |
21:20:51.98 |
+08:48:29.3 |
HIP 105503 |
18.68 |
| 2026-04-06 00:00 |
21:20:53.22 |
+08:48:45.7 |
HIP 105503 |
18.40 |
| 2026-04-06 12:00 |
21:20:54.43 |
+08:49:02.0 |
HIP 105503 |
18.13 |
| 2026-04-07 00:00 |
21:20:55.63 |
+08:49:18.3 |
HIP 105503 |
17.86 |
| 2026-04-07 12:00 |
21:20:56.82 |
+08:49:34.6 |
HIP 105503 |
17.61 |
| 2026-04-08 00:00 |
21:20:57.98 |
+08:49:50.8 |
HIP 105503 |
17.37 |
| 2026-04-08 12:00 |
21:20:59.13 |
+08:50:07.1 |
HIP 105503 |
17.13 |
| 2026-04-09 00:00 |
21:21:00.26 |
+08:50:23.4 |
HIP 105503 |
16.91 |
| 2026-04-09 12:00 |
21:21:01.37 |
+08:50:39.7 |
HIP 105503 |
16.69 |
| 2026-04-10 00:00 |
21:21:02.47 |
+08:50:55.9 |
HIP 105503 |
16.49 |
| 2026-04-10 12:00 |
21:21:03.55 |
+08:51:12.2 |
HIP 105503 |
16.30 |
| 2026-04-11 00:00 |
21:21:04.60 |
+08:51:28.4 |
HIP 105503 |
16.12 |
| 2026-04-11 12:00 |
21:21:05.65 |
+08:51:44.6 |
HIP 105503 |
15.95 |
| 2026-04-12 00:00 |
21:21:06.67 |
+08:52:00.8 |
HIP 105503 |
15.79 |
| 2026-04-12 12:00 |
21:21:07.67 |
+08:52:17.0 |
HIP 105503 |
15.64 |
| 2026-04-13 00:00 |
21:21:08.66 |
+08:52:33.1 |
HIP 105503 |
15.50 |
| 2026-04-13 12:00 |
21:21:09.63 |
+08:52:49.3 |
HIP 105503 |
15.38 |
| 2026-04-14 00:00 |
21:21:10.57 |
+08:53:05.4 |
HIP 105503 |
15.26 |
| 2026-04-14 12:00 |
21:21:11.50 |
+08:53:21.5 |
HIP 105503 |
15.16 |
| 2026-04-15 00:00 |
21:21:12.42 |
+08:53:37.5 |
HIP 105503 |
15.07 |
| 2026-04-15 12:00 |
21:21:13.31 |
+08:53:53.6 |
HIP 105503 |
14.99 |
| 2026-04-16 00:00 |
21:21:14.18 |
+08:54:09.6 |
HIP 105503 |
14.93 |