| 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) |
| 2026-03-26 00:00 |
02:42:21.53 |
+35:06:17.3 |
HIP 12776 |
22.49 |
| 2026-03-26 12:00 |
02:42:23.03 |
+35:06:18.0 |
HIP 12776 |
22.19 |
| 2026-03-27 00:00 |
02:42:24.55 |
+35:06:18.8 |
HIP 12776 |
21.87 |
| 2026-03-27 12:00 |
02:42:26.08 |
+35:06:19.7 |
HIP 12776 |
21.56 |
| 2026-03-28 00:00 |
02:42:27.62 |
+35:06:20.7 |
HIP 12776 |
21.25 |
| 2026-03-28 12:00 |
02:42:29.17 |
+35:06:21.7 |
HIP 12776 |
20.93 |
| 2026-03-29 00:00 |
02:42:30.72 |
+35:06:22.9 |
HIP 12776 |
20.61 |
| 2026-03-29 12:00 |
02:42:32.29 |
+35:06:24.1 |
HIP 12776 |
20.29 |
| 2026-03-30 00:00 |
02:42:33.86 |
+35:06:25.5 |
HIP 12776 |
19.97 |
| 2026-03-30 12:00 |
02:42:35.45 |
+35:06:26.9 |
HIP 12776 |
19.64 |
| 2026-03-31 00:00 |
02:42:37.04 |
+35:06:28.4 |
HIP 12776 |
19.32 |
| 2026-03-31 12:00 |
02:42:38.64 |
+35:06:30.0 |
HIP 12776 |
18.99 |
| 2026-04-01 00:00 |
02:42:40.25 |
+35:06:31.7 |
HIP 12776 |
18.66 |
| 2026-04-01 12:00 |
02:42:41.87 |
+35:06:33.5 |
HIP 12776 |
18.33 |
| 2026-04-02 00:00 |
02:42:43.50 |
+35:06:35.4 |
HIP 12776 |
17.99 |
| 2026-04-02 12:00 |
02:42:45.13 |
+35:06:37.4 |
HIP 12776 |
17.66 |
| 2026-04-03 00:00 |
02:42:46.78 |
+35:06:39.4 |
HIP 12776 |
17.32 |
| 2026-04-03 12:00 |
02:42:48.43 |
+35:06:41.6 |
HIP 12776 |
16.99 |
| 2026-04-04 00:00 |
02:42:50.09 |
+35:06:43.8 |
HIP 12776 |
16.65 |
| 2026-04-04 12:00 |
02:42:51.75 |
+35:06:46.1 |
HIP 12776 |
16.30 |
| 2026-04-05 00:00 |
02:42:53.43 |
+35:06:48.5 |
HIP 12776 |
15.96 |
| 2026-04-05 12:00 |
02:42:55.11 |
+35:06:51.0 |
HIP 12776 |
15.62 |
| 2026-04-06 00:00 |
02:42:56.80 |
+35:06:53.6 |
HIP 12776 |
15.27 |
| 2026-04-06 12:00 |
02:42:58.50 |
+35:06:56.3 |
HIP 12776 |
14.92 |
| 2026-04-07 00:00 |
02:43:00.20 |
+35:06:59.1 |
HIP 12776 |
14.58 |
| 2026-04-07 12:00 |
02:43:01.91 |
+35:07:01.9 |
HIP 12776 |
14.23 |
| 2026-04-08 00:00 |
02:43:03.63 |
+35:07:04.8 |
HIP 12776 |
13.88 |
| 2026-04-08 12:00 |
02:43:05.36 |
+35:07:07.9 |
HIP 12776 |
13.52 |
| 2026-04-09 00:00 |
02:43:07.09 |
+35:07:11.0 |
HIP 12776 |
13.17 |
| 2026-04-09 12:00 |
02:43:08.83 |
+35:07:14.2 |
HIP 12776 |
12.82 |
| 2026-04-10 00:00 |
02:43:10.57 |
+35:07:17.5 |
HIP 12776 |
12.46 |
| 2026-04-10 12:00 |
02:43:12.32 |
+35:07:20.8 |
HIP 12776 |
12.10 |
| 2026-04-11 00:00 |
02:43:14.08 |
+35:07:24.3 |
HIP 12776 |
11.75 |
| 2026-04-11 12:00 |
02:43:15.85 |
+35:07:27.9 |
HIP 12776 |
11.39 |
| 2026-04-12 00:00 |
02:43:17.62 |
+35:07:31.5 |
HIP 12776 |
11.03 |
| 2026-04-12 12:00 |
02:43:19.39 |
+35:07:35.2 |
HIP 12776 |
10.67 |
| 2026-04-13 00:00 |
02:43:21.17 |
+35:07:39.0 |
HIP 12776 |
10.31 |
| 2026-04-13 12:00 |
02:43:22.96 |
+35:07:42.9 |
HIP 12776 |
9.95 |
| 2026-04-14 00:00 |
02:43:24.76 |
+35:07:46.9 |
HIP 12776 |
9.59 |
| 2026-04-14 12:00 |
02:43:26.55 |
+35:07:50.9 |
HIP 12776 |
9.23 |
| 2026-04-15 00:00 |
02:43:28.36 |
+35:07:55.0 |
HIP 12776 |
8.88 |
| 2026-04-15 12:00 |
02:43:30.17 |
+35:07:59.3 |
HIP 12776 |
8.52 |
| 2026-04-16 00:00 |
02:43:31.98 |
+35:08:03.6 |
HIP 12776 |
8.16 |