C/1964 N1 (Ikeya)
| Parameter |
Value |
| Designation |
C/1964 N1 (Ikeya) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1964-08-01T05:13:48.668160Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:16Z |
| Obs used |
36 |
| NEO |
- |
| M1 |
- |
| K1 |
- |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1964-07-28.0000000 |
| e |
0.98529909 |
| q (au) |
0.821742 |
| a (au) |
55.897329 |
| i (deg) |
171.919437 |
| Ω (om, deg) |
269.947994 |
| ω (w, deg) |
290.768689 |
| M (ma, deg) |
359.990052 |
Magnitude
Scatter + Global Linear
$$
M_a = (7.144 + 3.169\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
7.144 |
| n |
3.169 |
| gf |
0.800 |
| gb |
-0.500 |
| k |
0.800 |
| 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 |
11:23:46.96 |
+12:32:43.4 |
HIP 55654 |
7.53 |
| 2026-02-03 12:00 |
11:23:45.64 |
+12:32:53.8 |
HIP 55654 |
7.88 |
| 2026-02-04 00:00 |
11:23:44.32 |
+12:33:04.2 |
HIP 55654 |
8.24 |
| 2026-02-04 12:00 |
11:23:42.99 |
+12:33:14.6 |
HIP 55654 |
8.60 |
| 2026-02-05 00:00 |
11:23:41.66 |
+12:33:25.0 |
HIP 55654 |
8.96 |
| 2026-02-05 12:00 |
11:23:40.31 |
+12:33:35.5 |
HIP 55654 |
9.32 |
| 2026-02-06 00:00 |
11:23:38.96 |
+12:33:46.0 |
HIP 55654 |
9.69 |
| 2026-02-06 12:00 |
11:23:37.60 |
+12:33:56.5 |
HIP 55654 |
10.06 |
| 2026-02-07 00:00 |
11:23:36.23 |
+12:34:07.0 |
HIP 55654 |
10.43 |
| 2026-02-07 12:00 |
11:23:34.85 |
+12:34:17.6 |
HIP 55654 |
10.80 |
| 2026-02-08 00:00 |
11:23:33.46 |
+12:34:28.2 |
HIP 55654 |
11.18 |
| 2026-02-08 12:00 |
11:23:32.07 |
+12:34:38.7 |
HIP 55654 |
11.56 |
| 2026-02-09 00:00 |
11:23:30.67 |
+12:34:49.3 |
HIP 55654 |
11.94 |
| 2026-02-09 12:00 |
11:23:29.27 |
+12:35:00.0 |
HIP 55654 |
12.32 |
| 2026-02-10 00:00 |
11:23:27.85 |
+12:35:10.6 |
HIP 55654 |
12.70 |
| 2026-02-10 12:00 |
11:23:26.43 |
+12:35:21.2 |
HIP 55654 |
13.08 |
| 2026-02-11 00:00 |
11:23:25.01 |
+12:35:31.9 |
HIP 55654 |
13.47 |
| 2026-02-11 12:00 |
11:23:23.57 |
+12:35:42.6 |
HIP 55654 |
13.86 |
| 2026-02-12 00:00 |
11:23:22.13 |
+12:35:53.3 |
HIP 55654 |
14.25 |
| 2026-02-12 12:00 |
11:23:20.68 |
+12:36:03.9 |
HIP 55604 |
14.24 |
| 2026-02-13 00:00 |
11:23:19.23 |
+12:36:14.6 |
HIP 55604 |
14.12 |
| 2026-02-13 12:00 |
11:23:17.77 |
+12:36:25.4 |
HIP 55604 |
14.01 |
| 2026-02-14 00:00 |
11:23:16.30 |
+12:36:36.1 |
HIP 55604 |
13.91 |
| 2026-02-14 12:00 |
11:23:14.83 |
+12:36:46.8 |
HIP 55604 |
13.82 |
| 2026-02-15 00:00 |
11:23:13.35 |
+12:36:57.5 |
HIP 55604 |
13.75 |
| 2026-02-15 12:00 |
11:23:11.87 |
+12:37:08.3 |
HIP 55604 |
13.68 |
| 2026-02-16 00:00 |
11:23:10.38 |
+12:37:19.0 |
HIP 55604 |
13.63 |
| 2026-02-16 12:00 |
11:23:08.88 |
+12:37:29.8 |
HIP 55604 |
13.59 |
| 2026-02-17 00:00 |
11:23:07.38 |
+12:37:40.5 |
HIP 55604 |
13.57 |
| 2026-02-17 12:00 |
11:23:05.88 |
+12:37:51.2 |
HIP 55604 |
13.55 |
| 2026-02-18 00:00 |
11:23:04.36 |
+12:38:02.0 |
HIP 55604 |
13.55 |
| 2026-02-18 12:00 |
11:23:02.85 |
+12:38:12.7 |
HIP 55604 |
13.56 |
| 2026-02-19 00:00 |
11:23:01.32 |
+12:38:23.5 |
HIP 55604 |
13.58 |
| 2026-02-19 12:00 |
11:22:59.80 |
+12:38:34.2 |
HIP 55604 |
13.62 |
| 2026-02-20 00:00 |
11:22:58.27 |
+12:38:45.0 |
HIP 55604 |
13.67 |
| 2026-02-20 12:00 |
11:22:56.73 |
+12:38:55.7 |
HIP 55604 |
13.74 |
| 2026-02-21 00:00 |
11:22:55.19 |
+12:39:06.4 |
HIP 55604 |
13.81 |
| 2026-02-21 12:00 |
11:22:53.65 |
+12:39:17.2 |
HIP 55604 |
13.90 |
| 2026-02-22 00:00 |
11:22:52.10 |
+12:39:27.9 |
HIP 55604 |
14.00 |
| 2026-02-22 12:00 |
11:22:50.54 |
+12:39:38.6 |
HIP 55604 |
14.12 |
| 2026-02-23 00:00 |
11:22:48.99 |
+12:39:49.3 |
HIP 55604 |
14.24 |
| 2026-02-23 12:00 |
11:22:47.43 |
+12:40:00.0 |
HIP 55604 |
14.38 |
| 2026-02-24 00:00 |
11:22:45.86 |
+12:40:10.7 |
HIP 55604 |
14.53 |