| 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) |
| 2026-07-29 00:00 |
03:51:48.76 |
+13:44:13.4 |
HIP 18145 |
18.95 |
| 2026-07-29 12:00 |
03:51:49.55 |
+13:44:13.4 |
HIP 18145 |
18.81 |
| 2026-07-30 00:00 |
03:51:50.33 |
+13:44:13.4 |
HIP 18145 |
18.67 |
| 2026-07-30 12:00 |
03:51:51.10 |
+13:44:13.3 |
HIP 18145 |
18.53 |
| 2026-07-31 00:00 |
03:51:51.84 |
+13:44:13.1 |
HIP 18145 |
18.40 |
| 2026-07-31 12:00 |
03:51:52.57 |
+13:44:12.9 |
HIP 18145 |
18.27 |
| 2026-08-01 00:00 |
03:51:53.29 |
+13:44:12.6 |
HIP 18145 |
18.15 |
| 2026-08-01 12:00 |
03:51:53.99 |
+13:44:12.3 |
HIP 18145 |
18.03 |
| 2026-08-02 00:00 |
03:51:54.67 |
+13:44:11.9 |
HIP 18145 |
17.92 |
| 2026-08-02 12:00 |
03:51:55.33 |
+13:44:11.4 |
HIP 18145 |
17.81 |
| 2026-08-03 00:00 |
03:51:55.98 |
+13:44:10.8 |
HIP 18145 |
17.71 |
| 2026-08-03 12:00 |
03:51:56.61 |
+13:44:10.2 |
HIP 18145 |
17.61 |
| 2026-08-04 00:00 |
03:51:57.22 |
+13:44:09.6 |
HIP 18145 |
17.51 |
| 2026-08-04 12:00 |
03:51:57.82 |
+13:44:08.8 |
HIP 18145 |
17.42 |
| 2026-08-05 00:00 |
03:51:58.40 |
+13:44:08.0 |
HIP 18145 |
17.34 |
| 2026-08-05 12:00 |
03:51:58.96 |
+13:44:07.2 |
HIP 18145 |
17.25 |
| 2026-08-06 00:00 |
03:51:59.50 |
+13:44:06.3 |
HIP 18145 |
17.18 |
| 2026-08-06 12:00 |
03:52:00.03 |
+13:44:05.3 |
HIP 18145 |
17.10 |
| 2026-08-07 00:00 |
03:52:00.54 |
+13:44:04.2 |
HIP 18145 |
17.03 |
| 2026-08-07 12:00 |
03:52:01.03 |
+13:44:03.1 |
HIP 18145 |
16.97 |
| 2026-08-08 00:00 |
03:52:01.51 |
+13:44:01.9 |
HIP 18145 |
16.91 |
| 2026-08-08 12:00 |
03:52:01.96 |
+13:44:00.7 |
HIP 18145 |
16.85 |
| 2026-08-09 00:00 |
03:52:02.40 |
+13:43:59.4 |
HIP 18145 |
16.80 |
| 2026-08-09 12:00 |
03:52:02.83 |
+13:43:58.0 |
HIP 18145 |
16.75 |
| 2026-08-10 00:00 |
03:52:03.23 |
+13:43:56.6 |
HIP 18145 |
16.70 |
| 2026-08-10 12:00 |
03:52:03.62 |
+13:43:55.1 |
HIP 18145 |
16.66 |
| 2026-08-11 00:00 |
03:52:03.99 |
+13:43:53.5 |
HIP 18145 |
16.63 |
| 2026-08-11 12:00 |
03:52:04.34 |
+13:43:51.9 |
HIP 18145 |
16.60 |
| 2026-08-12 00:00 |
03:52:04.67 |
+13:43:50.2 |
HIP 18145 |
16.57 |
| 2026-08-12 12:00 |
03:52:04.98 |
+13:43:48.4 |
HIP 18145 |
16.54 |
| 2026-08-13 00:00 |
03:52:05.28 |
+13:43:46.6 |
HIP 18145 |
16.52 |
| 2026-08-13 12:00 |
03:52:05.56 |
+13:43:44.7 |
HIP 18145 |
16.51 |
| 2026-08-14 00:00 |
03:52:05.82 |
+13:43:42.8 |
HIP 18145 |
16.49 |
| 2026-08-14 12:00 |
03:52:06.06 |
+13:43:40.8 |
HIP 18145 |
16.48 |
| 2026-08-15 00:00 |
03:52:06.29 |
+13:43:38.7 |
HIP 18145 |
16.48 |
| 2026-08-15 12:00 |
03:52:06.49 |
+13:43:36.6 |
HIP 18145 |
16.48 |
| 2026-08-16 00:00 |
03:52:06.68 |
+13:43:34.4 |
HIP 18145 |
16.48 |
| 2026-08-16 12:00 |
03:52:06.85 |
+13:43:32.2 |
HIP 18145 |
16.48 |
| 2026-08-17 00:00 |
03:52:07.00 |
+13:43:29.9 |
HIP 18145 |
16.49 |
| 2026-08-17 12:00 |
03:52:07.13 |
+13:43:27.5 |
HIP 18145 |
16.51 |
| 2026-08-18 00:00 |
03:52:07.25 |
+13:43:25.1 |
HIP 18145 |
16.52 |
| 2026-08-18 12:00 |
03:52:07.34 |
+13:43:22.6 |
HIP 18145 |
16.54 |
| 2026-08-19 00:00 |
03:52:07.42 |
+13:43:20.0 |
HIP 18145 |
16.57 |