C/1994 J2 (Takamizawa)
| Parameter |
Value |
| Designation |
C/1994 J2 (Takamizawa) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1994-06-29T14:44:36.781440Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:47Z |
| Obs used |
399 |
| NEO |
- |
| M1 |
9.500 |
| K1 |
4.500 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1994-12-15.0000000 |
| e |
0.99623127 |
| q (au) |
1.947740 |
| a (au) |
516.815888 |
| i (deg) |
135.961791 |
| Ω (om, deg) |
51.129192 |
| ω (w, deg) |
192.116161 |
| M (ma, deg) |
0.014126 |
Magnitude
Scatter + Global Linear
$$
M_a = (8.389 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
8.389 |
| n |
2.000 |
| gf |
0.800 |
| gb |
-0.500 |
| k |
0.972 |
| 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 |
03:44:12.48 |
+13:09:57.6 |
HIP 17557 |
20.91 |
| 2026-02-03 12:00 |
03:44:11.84 |
+13:10:00.1 |
HIP 17557 |
21.05 |
| 2026-02-04 00:00 |
03:44:11.23 |
+13:10:02.7 |
HIP 17557 |
21.19 |
| 2026-02-04 12:00 |
03:44:10.63 |
+13:10:05.3 |
HIP 17557 |
21.32 |
| 2026-02-05 00:00 |
03:44:10.05 |
+13:10:08.0 |
HIP 17557 |
21.44 |
| 2026-02-05 12:00 |
03:44:09.49 |
+13:10:10.8 |
HIP 17557 |
21.57 |
| 2026-02-06 00:00 |
03:44:08.95 |
+13:10:13.7 |
HIP 17557 |
21.69 |
| 2026-02-06 12:00 |
03:44:08.43 |
+13:10:16.6 |
HIP 17557 |
21.80 |
| 2026-02-07 00:00 |
03:44:07.93 |
+13:10:19.6 |
HIP 17557 |
21.91 |
| 2026-02-07 12:00 |
03:44:07.45 |
+13:10:22.7 |
HIP 17557 |
22.01 |
| 2026-02-08 00:00 |
03:44:06.98 |
+13:10:25.8 |
HIP 17557 |
22.11 |
| 2026-02-08 12:00 |
03:44:06.54 |
+13:10:29.0 |
HIP 17557 |
22.21 |
| 2026-02-09 00:00 |
03:44:06.12 |
+13:10:32.3 |
HIP 17557 |
22.30 |
| 2026-02-09 12:00 |
03:44:05.71 |
+13:10:35.6 |
HIP 17557 |
22.38 |
| 2026-02-10 00:00 |
03:44:05.33 |
+13:10:39.0 |
HIP 17557 |
22.46 |
| 2026-02-10 12:00 |
03:44:04.96 |
+13:10:42.5 |
HIP 17557 |
22.54 |
| 2026-02-11 00:00 |
03:44:04.62 |
+13:10:46.1 |
HIP 17557 |
22.61 |
| 2026-02-11 12:00 |
03:44:04.29 |
+13:10:49.7 |
HIP 17557 |
22.68 |
| 2026-02-12 00:00 |
03:44:03.98 |
+13:10:53.3 |
HIP 17557 |
22.74 |
| 2026-02-12 12:00 |
03:44:03.70 |
+13:10:57.1 |
HIP 17557 |
22.80 |
| 2026-02-13 00:00 |
03:44:03.43 |
+13:11:00.9 |
HIP 17557 |
22.85 |
| 2026-02-13 12:00 |
03:44:03.18 |
+13:11:04.8 |
HIP 17557 |
22.90 |
| 2026-02-14 00:00 |
03:44:02.95 |
+13:11:08.7 |
HIP 17557 |
22.95 |
| 2026-02-14 12:00 |
03:44:02.74 |
+13:11:12.7 |
HIP 17557 |
22.99 |
| 2026-02-15 00:00 |
03:44:02.56 |
+13:11:16.8 |
HIP 17557 |
23.02 |
| 2026-02-15 12:00 |
03:44:02.39 |
+13:11:20.9 |
HIP 17557 |
23.05 |
| 2026-02-16 00:00 |
03:44:02.24 |
+13:11:25.1 |
HIP 17557 |
23.08 |
| 2026-02-16 12:00 |
03:44:02.11 |
+13:11:29.4 |
HIP 17557 |
23.10 |
| 2026-02-17 00:00 |
03:44:02.00 |
+13:11:33.7 |
HIP 17557 |
23.11 |
| 2026-02-17 12:00 |
03:44:01.90 |
+13:11:38.1 |
HIP 17557 |
23.13 |
| 2026-02-18 00:00 |
03:44:01.83 |
+13:11:42.5 |
HIP 17557 |
23.13 |
| 2026-02-18 12:00 |
03:44:01.78 |
+13:11:47.1 |
HIP 17557 |
23.13 |
| 2026-02-19 00:00 |
03:44:01.75 |
+13:11:51.6 |
HIP 17557 |
23.13 |
| 2026-02-19 12:00 |
03:44:01.74 |
+13:11:56.3 |
HIP 17557 |
23.13 |
| 2026-02-20 00:00 |
03:44:01.74 |
+13:12:01.0 |
HIP 17557 |
23.11 |
| 2026-02-20 12:00 |
03:44:01.77 |
+13:12:05.7 |
HIP 17557 |
23.10 |
| 2026-02-21 00:00 |
03:44:01.81 |
+13:12:10.6 |
HIP 17557 |
23.08 |
| 2026-02-21 12:00 |
03:44:01.88 |
+13:12:15.4 |
HIP 17557 |
23.05 |
| 2026-02-22 00:00 |
03:44:01.96 |
+13:12:20.4 |
HIP 17557 |
23.02 |
| 2026-02-22 12:00 |
03:44:02.07 |
+13:12:25.4 |
HIP 17557 |
22.99 |
| 2026-02-23 00:00 |
03:44:02.19 |
+13:12:30.4 |
HIP 17557 |
22.95 |
| 2026-02-23 12:00 |
03:44:02.33 |
+13:12:35.6 |
HIP 17557 |
22.91 |
| 2026-02-24 00:00 |
03:44:02.49 |
+13:12:40.7 |
HIP 17557 |
22.86 |