C/1987 B2 (Terasako)
| Parameter |
Value |
| Designation |
C/1987 B2 (Terasako) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1986-12-24T21:01:50.280960Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:33Z |
| Obs used |
49 |
| NEO |
- |
| M1 |
- |
| K1 |
- |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1987-02-07.0000000 |
| e |
0.99522002 |
| q (au) |
0.392887 |
| a (au) |
82.194165 |
| i (deg) |
40.856893 |
| Ω (om, deg) |
97.699267 |
| ω (w, deg) |
195.270339 |
| M (ma, deg) |
0.058360 |
Magnitude
Scatter + Global Linear
$$
M_a = (6.280 + 3.326\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
6.280 |
| n |
3.326 |
| gf |
0.998 |
| gb |
-1.000 |
| k |
0.992 |
| δ90 |
9.999 |
| 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 |
06:59:18.49 |
+27:59:18.9 |
HIP 33662 |
17.41 |
| 2026-02-03 12:00 |
06:59:16.49 |
+27:59:20.4 |
HIP 33662 |
17.48 |
| 2026-02-04 00:00 |
06:59:14.50 |
+27:59:22.0 |
HIP 33662 |
17.56 |
| 2026-02-04 12:00 |
06:59:12.53 |
+27:59:23.5 |
HIP 33662 |
17.65 |
| 2026-02-05 00:00 |
06:59:10.56 |
+27:59:24.9 |
HIP 33662 |
17.76 |
| 2026-02-05 12:00 |
06:59:08.61 |
+27:59:26.3 |
HIP 33662 |
17.87 |
| 2026-02-06 00:00 |
06:59:06.67 |
+27:59:27.7 |
HIP 33662 |
17.99 |
| 2026-02-06 12:00 |
06:59:04.73 |
+27:59:29.1 |
HIP 33662 |
18.12 |
| 2026-02-07 00:00 |
06:59:02.81 |
+27:59:30.4 |
HIP 33662 |
18.26 |
| 2026-02-07 12:00 |
06:59:00.91 |
+27:59:31.6 |
HIP 33662 |
18.41 |
| 2026-02-08 00:00 |
06:58:59.01 |
+27:59:32.9 |
HIP 33662 |
18.56 |
| 2026-02-08 12:00 |
06:58:57.13 |
+27:59:34.1 |
HIP 33662 |
18.73 |
| 2026-02-09 00:00 |
06:58:55.25 |
+27:59:35.2 |
HIP 33662 |
18.90 |
| 2026-02-09 12:00 |
06:58:53.40 |
+27:59:36.3 |
HIP 33662 |
19.07 |
| 2026-02-10 00:00 |
06:58:51.55 |
+27:59:37.4 |
HIP 33662 |
19.26 |
| 2026-02-10 12:00 |
06:58:49.71 |
+27:59:38.5 |
HIP 33662 |
19.45 |
| 2026-02-11 00:00 |
06:58:47.89 |
+27:59:39.5 |
HIP 33662 |
19.64 |
| 2026-02-11 12:00 |
06:58:46.09 |
+27:59:40.4 |
HIP 33662 |
19.84 |
| 2026-02-12 00:00 |
06:58:44.29 |
+27:59:41.4 |
HIP 33662 |
20.04 |
| 2026-02-12 12:00 |
06:58:42.51 |
+27:59:42.2 |
HIP 33662 |
20.25 |
| 2026-02-13 00:00 |
06:58:40.74 |
+27:59:43.1 |
HIP 33662 |
20.47 |
| 2026-02-13 12:00 |
06:58:38.99 |
+27:59:43.9 |
HIP 33662 |
20.68 |
| 2026-02-14 00:00 |
06:58:37.24 |
+27:59:44.7 |
HIP 33662 |
20.90 |
| 2026-02-14 12:00 |
06:58:35.52 |
+27:59:45.4 |
HIP 33662 |
21.13 |
| 2026-02-15 00:00 |
06:58:33.80 |
+27:59:46.1 |
HIP 33662 |
21.36 |
| 2026-02-15 12:00 |
06:58:32.10 |
+27:59:46.8 |
HIP 33662 |
21.59 |
| 2026-02-16 00:00 |
06:58:30.42 |
+27:59:47.4 |
HIP 33662 |
21.82 |
| 2026-02-16 12:00 |
06:58:28.75 |
+27:59:48.0 |
HIP 33662 |
22.05 |
| 2026-02-17 00:00 |
06:58:27.09 |
+27:59:48.5 |
HIP 33662 |
22.29 |
| 2026-02-17 12:00 |
06:58:25.45 |
+27:59:49.0 |
HIP 33662 |
22.53 |
| 2026-02-18 00:00 |
06:58:23.83 |
+27:59:49.5 |
HIP 33662 |
22.77 |
| 2026-02-18 12:00 |
06:58:22.22 |
+27:59:50.0 |
HIP 33662 |
23.01 |
| 2026-02-19 00:00 |
06:58:20.62 |
+27:59:50.3 |
HIP 33662 |
23.25 |
| 2026-02-19 12:00 |
06:58:19.04 |
+27:59:50.7 |
HIP 33662 |
23.49 |
| 2026-02-20 00:00 |
06:58:17.47 |
+27:59:51.0 |
HIP 33662 |
23.73 |
| 2026-02-20 12:00 |
06:58:15.92 |
+27:59:51.3 |
HIP 33662 |
23.98 |
| 2026-02-21 00:00 |
06:58:14.39 |
+27:59:51.5 |
HIP 33662 |
24.22 |
| 2026-02-21 12:00 |
06:58:12.87 |
+27:59:51.8 |
HIP 33662 |
24.47 |
| 2026-02-22 00:00 |
06:58:11.37 |
+27:59:51.9 |
HIP 33662 |
24.71 |
| 2026-02-22 12:00 |
06:58:09.88 |
+27:59:52.1 |
HIP 33662 |
24.95 |
| 2026-02-23 00:00 |
06:58:08.41 |
+27:59:52.1 |
HIP 33662 |
25.20 |
| 2026-02-23 12:00 |
06:58:06.95 |
+27:59:52.2 |
HIP 33662 |
25.44 |
| 2026-02-24 00:00 |
06:58:05.51 |
+27:59:52.2 |
HIP 33662 |
25.68 |