C/1978 T1 (Seargent)
| Parameter |
Value |
| Designation |
C/1978 T1 (Seargent) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1978-09-14T20:22:48.953280Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:27Z |
| Obs used |
33 |
| NEO |
- |
| M1 |
- |
| K1 |
- |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1978-10-15.0000000 |
| e |
0.99833325 |
| q (au) |
0.369876 |
| a (au) |
221.914124 |
| i (deg) |
67.828275 |
| Ω (om, deg) |
41.774963 |
| ω (w, deg) |
207.756634 |
| M (ma, deg) |
0.008989 |
Magnitude
Scatter + Global Linear
$$
M_a = (8.252 + 3.969\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
8.252 |
| n |
3.969 |
| gf |
0.800 |
| gb |
-0.500 |
| k |
1.000 |
| δ90 |
1.000 |
| 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 |
02:40:56.95 |
+35:13:00.0 |
HIP 12467 |
6.75 |
| 2026-02-03 12:00 |
02:40:56.98 |
+35:12:51.9 |
HIP 12467 |
6.85 |
| 2026-02-04 00:00 |
02:40:57.04 |
+35:12:43.9 |
HIP 12467 |
6.94 |
| 2026-02-04 12:00 |
02:40:57.11 |
+35:12:36.0 |
HIP 12467 |
7.04 |
| 2026-02-05 00:00 |
02:40:57.20 |
+35:12:28.1 |
HIP 12467 |
7.14 |
| 2026-02-05 12:00 |
02:40:57.30 |
+35:12:20.3 |
HIP 12467 |
7.25 |
| 2026-02-06 00:00 |
02:40:57.43 |
+35:12:12.5 |
HIP 12467 |
7.36 |
| 2026-02-06 12:00 |
02:40:57.56 |
+35:12:04.9 |
HIP 12467 |
7.47 |
| 2026-02-07 00:00 |
02:40:57.72 |
+35:11:57.3 |
HIP 12467 |
7.58 |
| 2026-02-07 12:00 |
02:40:57.89 |
+35:11:49.7 |
HIP 12467 |
7.69 |
| 2026-02-08 00:00 |
02:40:58.09 |
+35:11:42.3 |
HIP 12467 |
7.81 |
| 2026-02-08 12:00 |
02:40:58.29 |
+35:11:34.9 |
HIP 12467 |
7.93 |
| 2026-02-09 00:00 |
02:40:58.52 |
+35:11:27.6 |
HIP 12467 |
8.05 |
| 2026-02-09 12:00 |
02:40:58.76 |
+35:11:20.4 |
HIP 12467 |
8.17 |
| 2026-02-10 00:00 |
02:40:59.02 |
+35:11:13.2 |
HIP 12467 |
8.29 |
| 2026-02-10 12:00 |
02:40:59.29 |
+35:11:06.1 |
HIP 12467 |
8.42 |
| 2026-02-11 00:00 |
02:40:59.59 |
+35:10:59.1 |
HIP 12467 |
8.54 |
| 2026-02-11 12:00 |
02:40:59.90 |
+35:10:52.2 |
HIP 12467 |
8.67 |
| 2026-02-12 00:00 |
02:41:00.22 |
+35:10:45.3 |
HIP 12467 |
8.80 |
| 2026-02-12 12:00 |
02:41:00.56 |
+35:10:38.5 |
HIP 12467 |
8.93 |
| 2026-02-13 00:00 |
02:41:00.92 |
+35:10:31.8 |
HIP 12467 |
9.07 |
| 2026-02-13 12:00 |
02:41:01.30 |
+35:10:25.2 |
HIP 12467 |
9.20 |
| 2026-02-14 00:00 |
02:41:01.69 |
+35:10:18.6 |
HIP 12467 |
9.33 |
| 2026-02-14 12:00 |
02:41:02.10 |
+35:10:12.2 |
HIP 12467 |
9.47 |
| 2026-02-15 00:00 |
02:41:02.53 |
+35:10:05.8 |
HIP 12467 |
9.61 |
| 2026-02-15 12:00 |
02:41:02.97 |
+35:09:59.5 |
HIP 12467 |
9.75 |
| 2026-02-16 00:00 |
02:41:03.43 |
+35:09:53.3 |
HIP 12467 |
9.89 |
| 2026-02-16 12:00 |
02:41:03.91 |
+35:09:47.1 |
HIP 12467 |
10.03 |
| 2026-02-17 00:00 |
02:41:04.40 |
+35:09:41.0 |
HIP 12467 |
10.17 |
| 2026-02-17 12:00 |
02:41:04.91 |
+35:09:35.1 |
HIP 12467 |
10.31 |
| 2026-02-18 00:00 |
02:41:05.44 |
+35:09:29.2 |
HIP 12467 |
10.46 |
| 2026-02-18 12:00 |
02:41:05.98 |
+35:09:23.3 |
HIP 12467 |
10.60 |
| 2026-02-19 00:00 |
02:41:06.54 |
+35:09:17.6 |
HIP 12467 |
10.75 |
| 2026-02-19 12:00 |
02:41:07.11 |
+35:09:11.9 |
HIP 12467 |
10.90 |
| 2026-02-20 00:00 |
02:41:07.70 |
+35:09:06.4 |
HIP 12467 |
11.05 |
| 2026-02-20 12:00 |
02:41:08.31 |
+35:09:00.9 |
HIP 12467 |
11.20 |
| 2026-02-21 00:00 |
02:41:08.93 |
+35:08:55.5 |
HIP 12467 |
11.35 |
| 2026-02-21 12:00 |
02:41:09.57 |
+35:08:50.2 |
HIP 12467 |
11.51 |
| 2026-02-22 00:00 |
02:41:10.23 |
+35:08:45.0 |
HIP 12467 |
11.66 |
| 2026-02-22 12:00 |
02:41:10.90 |
+35:08:39.8 |
HIP 12467 |
11.82 |
| 2026-02-23 00:00 |
02:41:11.58 |
+35:08:34.8 |
HIP 12467 |
11.97 |
| 2026-02-23 12:00 |
02:41:12.29 |
+35:08:29.8 |
HIP 12467 |
12.13 |
| 2026-02-24 00:00 |
02:41:13.00 |
+35:08:24.9 |
HIP 12467 |
12.29 |