C/1932 M2 (Geddes)
| Parameter |
Value |
| Designation |
C/1932 M2 (Geddes) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1932-09-20T21:14:07.022400Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:05Z |
| Obs used |
15 |
| NEO |
- |
| M1 |
6.100 |
| K1 |
4.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1933-04-05.0000000 |
| e |
0.99929446 |
| q (au) |
2.312627 |
| a (au) |
3277.828381 |
| i (deg) |
124.976898 |
| Ω (om, deg) |
216.080116 |
| ω (w, deg) |
329.630678 |
| M (ma, deg) |
0.001030 |
Magnitude
Scatter + Global Linear
$$
M_a = (3.349 + 3.145\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
3.349 |
| n |
3.145 |
| gf |
1.000 |
| gb |
-0.864 |
| k |
1.000 |
| δ90 |
10.000 |
| 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 |
03:37:03.42 |
+57:12:20.7 |
HIP 16974 |
19.38 |
| 2026-02-03 12:00 |
03:37:02.97 |
+57:12:10.2 |
HIP 16974 |
19.27 |
| 2026-02-04 00:00 |
03:37:02.54 |
+57:11:59.7 |
HIP 16974 |
19.15 |
| 2026-02-04 12:00 |
03:37:02.13 |
+57:11:49.2 |
HIP 16974 |
19.04 |
| 2026-02-05 00:00 |
03:37:01.73 |
+57:11:38.8 |
HIP 16974 |
18.92 |
| 2026-02-05 12:00 |
03:37:01.35 |
+57:11:28.3 |
HIP 16974 |
18.81 |
| 2026-02-06 00:00 |
03:37:00.99 |
+57:11:17.8 |
HIP 16974 |
18.69 |
| 2026-02-06 12:00 |
03:37:00.64 |
+57:11:07.4 |
HIP 16974 |
18.58 |
| 2026-02-07 00:00 |
03:37:00.31 |
+57:10:57.0 |
HIP 16974 |
18.47 |
| 2026-02-07 12:00 |
03:37:00.00 |
+57:10:46.5 |
HIP 16974 |
18.35 |
| 2026-02-08 00:00 |
03:36:59.69 |
+57:10:36.1 |
HIP 16974 |
18.23 |
| 2026-02-08 12:00 |
03:36:59.41 |
+57:10:25.8 |
HIP 16974 |
18.12 |
| 2026-02-09 00:00 |
03:36:59.14 |
+57:10:15.4 |
HIP 16974 |
18.00 |
| 2026-02-09 12:00 |
03:36:58.90 |
+57:10:05.0 |
HIP 16974 |
17.89 |
| 2026-02-10 00:00 |
03:36:58.66 |
+57:09:54.7 |
HIP 16974 |
17.77 |
| 2026-02-10 12:00 |
03:36:58.45 |
+57:09:44.4 |
HIP 16974 |
17.66 |
| 2026-02-11 00:00 |
03:36:58.25 |
+57:09:34.1 |
HIP 16974 |
17.54 |
| 2026-02-11 12:00 |
03:36:58.07 |
+57:09:23.8 |
HIP 16974 |
17.42 |
| 2026-02-12 00:00 |
03:36:57.90 |
+57:09:13.5 |
HIP 16974 |
17.31 |
| 2026-02-12 12:00 |
03:36:57.75 |
+57:09:03.3 |
HIP 16974 |
17.19 |
| 2026-02-13 00:00 |
03:36:57.62 |
+57:08:53.1 |
HIP 16974 |
17.07 |
| 2026-02-13 12:00 |
03:36:57.51 |
+57:08:42.9 |
HIP 16974 |
16.96 |
| 2026-02-14 00:00 |
03:36:57.41 |
+57:08:32.7 |
HIP 16974 |
16.84 |
| 2026-02-14 12:00 |
03:36:57.33 |
+57:08:22.5 |
HIP 16974 |
16.72 |
| 2026-02-15 00:00 |
03:36:57.26 |
+57:08:12.4 |
HIP 16974 |
16.60 |
| 2026-02-15 12:00 |
03:36:57.21 |
+57:08:02.3 |
HIP 16974 |
16.48 |
| 2026-02-16 00:00 |
03:36:57.18 |
+57:07:52.3 |
HIP 16974 |
16.36 |
| 2026-02-16 12:00 |
03:36:57.17 |
+57:07:42.2 |
HIP 16974 |
16.24 |
| 2026-02-17 00:00 |
03:36:57.17 |
+57:07:32.2 |
HIP 16974 |
16.12 |
| 2026-02-17 12:00 |
03:36:57.19 |
+57:07:22.2 |
HIP 16974 |
16.00 |
| 2026-02-18 00:00 |
03:36:57.22 |
+57:07:12.3 |
HIP 16974 |
15.88 |
| 2026-02-18 12:00 |
03:36:57.27 |
+57:07:02.3 |
HIP 16974 |
15.76 |
| 2026-02-19 00:00 |
03:36:57.34 |
+57:06:52.4 |
HIP 16974 |
15.64 |
| 2026-02-19 12:00 |
03:36:57.43 |
+57:06:42.6 |
HIP 16974 |
15.52 |
| 2026-02-20 00:00 |
03:36:57.53 |
+57:06:32.8 |
HIP 16974 |
15.39 |
| 2026-02-20 12:00 |
03:36:57.65 |
+57:06:23.0 |
HIP 16974 |
15.27 |
| 2026-02-21 00:00 |
03:36:57.78 |
+57:06:13.2 |
HIP 16974 |
15.15 |
| 2026-02-21 12:00 |
03:36:57.93 |
+57:06:03.5 |
HIP 16974 |
15.02 |
| 2026-02-22 00:00 |
03:36:58.10 |
+57:05:53.8 |
HIP 16974 |
14.90 |
| 2026-02-22 12:00 |
03:36:58.29 |
+57:05:44.1 |
HIP 16974 |
14.77 |
| 2026-02-23 00:00 |
03:36:58.49 |
+57:05:34.5 |
HIP 16974 |
14.65 |
| 2026-02-23 12:00 |
03:36:58.70 |
+57:05:25.0 |
HIP 16974 |
14.52 |
| 2026-02-24 00:00 |
03:36:58.94 |
+57:05:15.4 |
HIP 16974 |
14.39 |