C/1998 T1 (LINEAR)
| Parameter |
Value |
| Designation |
C/1998 T1 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1999-06-25T05:58:21.192960Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:57Z |
| Obs used |
376 |
| NEO |
- |
| M1 |
12.200 |
| K1 |
4.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1999-05-05.0000000 |
| e |
0.99911409 |
| q (au) |
1.467728 |
| a (au) |
1656.736959 |
| i (deg) |
170.159948 |
| Ω (om, deg) |
153.357852 |
| ω (w, deg) |
226.351694 |
| M (ma, deg) |
359.999251 |
Magnitude
Scatter + Global Linear
$$
M_a = (9.231 + 4.429\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
9.231 |
| n |
4.429 |
| gf |
1.000 |
| gb |
-0.516 |
| 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) |
| 2026-02-03 00:00 |
08:42:33.09 |
+22:50:13.8 |
HIP 42840 |
18.29 |
| 2026-02-03 12:00 |
08:42:30.37 |
+22:50:23.8 |
HIP 42840 |
18.93 |
| 2026-02-04 00:00 |
08:42:27.64 |
+22:50:33.8 |
HIP 42840 |
19.57 |
| 2026-02-04 12:00 |
08:42:24.92 |
+22:50:43.7 |
HIP 42840 |
20.21 |
| 2026-02-05 00:00 |
08:42:22.20 |
+22:50:53.6 |
HIP 42840 |
20.85 |
| 2026-02-05 12:00 |
08:42:19.48 |
+22:51:03.4 |
HIP 42840 |
21.50 |
| 2026-02-06 00:00 |
08:42:16.77 |
+22:51:13.2 |
HIP 42840 |
22.14 |
| 2026-02-06 12:00 |
08:42:14.06 |
+22:51:22.9 |
HIP 42840 |
22.77 |
| 2026-02-07 00:00 |
08:42:11.35 |
+22:51:32.6 |
HIP 42840 |
23.41 |
| 2026-02-07 12:00 |
08:42:08.65 |
+22:51:42.3 |
HIP 42840 |
24.05 |
| 2026-02-08 00:00 |
08:42:05.95 |
+22:51:51.9 |
HIP 42840 |
24.69 |
| 2026-02-08 12:00 |
08:42:03.26 |
+22:52:01.5 |
HIP 42840 |
25.32 |
| 2026-02-09 00:00 |
08:42:00.57 |
+22:52:11.0 |
HIP 42840 |
25.96 |
| 2026-02-09 12:00 |
08:41:57.89 |
+22:52:20.5 |
HIP 42840 |
26.59 |
| 2026-02-10 00:00 |
08:41:55.21 |
+22:52:29.9 |
HIP 42840 |
27.22 |
| 2026-02-10 12:00 |
08:41:52.54 |
+22:52:39.3 |
HIP 42840 |
27.86 |
| 2026-02-11 00:00 |
08:41:49.87 |
+22:52:48.6 |
HIP 42840 |
28.48 |
| 2026-02-11 12:00 |
08:41:47.21 |
+22:52:57.9 |
HIP 42840 |
29.11 |
| 2026-02-12 00:00 |
08:41:44.55 |
+22:53:07.1 |
HIP 42840 |
29.74 |
| 2026-02-12 12:00 |
08:41:41.90 |
+22:53:16.3 |
HIP 42840 |
30.37 |
| 2026-02-13 00:00 |
08:41:39.26 |
+22:53:25.4 |
HIP 42840 |
30.99 |
| 2026-02-13 12:00 |
08:41:36.63 |
+22:53:34.5 |
HIP 42840 |
31.61 |
| 2026-02-14 00:00 |
08:41:34.00 |
+22:53:43.5 |
HIP 42840 |
32.23 |
| 2026-02-14 12:00 |
08:41:31.37 |
+22:53:52.5 |
HIP 42443 |
32.01 |
| 2026-02-15 00:00 |
08:41:28.76 |
+22:54:01.4 |
HIP 42443 |
31.44 |
| 2026-02-15 12:00 |
08:41:26.15 |
+22:54:10.2 |
HIP 42443 |
30.87 |
| 2026-02-16 00:00 |
08:41:23.55 |
+22:54:19.0 |
HIP 42443 |
30.31 |
| 2026-02-16 12:00 |
08:41:20.96 |
+22:54:27.7 |
HIP 42443 |
29.76 |
| 2026-02-17 00:00 |
08:41:18.38 |
+22:54:36.4 |
HIP 42443 |
29.21 |
| 2026-02-17 12:00 |
08:41:15.80 |
+22:54:45.0 |
HIP 42443 |
28.66 |
| 2026-02-18 00:00 |
08:41:13.23 |
+22:54:53.6 |
HIP 42443 |
28.11 |
| 2026-02-18 12:00 |
08:41:10.68 |
+22:55:02.1 |
HIP 42443 |
27.57 |
| 2026-02-19 00:00 |
08:41:08.13 |
+22:55:10.6 |
HIP 42443 |
27.04 |
| 2026-02-19 12:00 |
08:41:05.59 |
+22:55:18.9 |
HIP 42443 |
26.51 |
| 2026-02-20 00:00 |
08:41:03.06 |
+22:55:27.3 |
HIP 42443 |
25.98 |
| 2026-02-20 12:00 |
08:41:00.53 |
+22:55:35.5 |
HIP 42443 |
25.46 |
| 2026-02-21 00:00 |
08:40:58.02 |
+22:55:43.7 |
HIP 42443 |
24.95 |
| 2026-02-21 12:00 |
08:40:55.52 |
+22:55:51.8 |
HIP 42443 |
24.44 |
| 2026-02-22 00:00 |
08:40:53.03 |
+22:56:00.0 |
HIP 42443 |
23.93 |
| 2026-02-22 12:00 |
08:40:50.55 |
+22:56:07.9 |
HIP 42443 |
23.44 |
| 2026-02-23 00:00 |
08:40:48.08 |
+22:56:15.8 |
HIP 42443 |
22.95 |
| 2026-02-23 12:00 |
08:40:45.62 |
+22:56:23.7 |
HIP 42443 |
22.46 |
| 2026-02-24 00:00 |
08:40:43.17 |
+22:56:31.5 |
HIP 42443 |
21.98 |