| Parameter |
Value |
| Designation |
C/1933 D1 (Peltier) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1933-02-06T16:43:23.779200Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:05Z |
| Obs used |
14 |
| NEO |
- |
| M1 |
11.300 |
| K1 |
12.000 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1933-03-01.0000000 |
| e |
0.99999873 |
| q (au) |
1.000679 |
| a (au) |
787220.711133 |
| i (deg) |
86.680374 |
| Ω (om, deg) |
312.466777 |
| ω (w, deg) |
135.984212 |
| M (ma, deg) |
0.000000 |
Magnitude
Scatter + Global Linear
$$
M_a = (10.760 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
10.760 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
0.800 |
| 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) |
| 2026-05-12 00:00 |
23:03:58.99 |
-68:08:34.5 |
HIP 113911 |
12.32 |
| 2026-05-12 12:00 |
23:04:00.02 |
-68:08:45.6 |
HIP 113911 |
12.13 |
| 2026-05-13 00:00 |
23:04:01.03 |
-68:08:56.8 |
HIP 113911 |
11.94 |
| 2026-05-13 12:00 |
23:04:02.02 |
-68:09:08.1 |
HIP 113911 |
11.75 |
| 2026-05-14 00:00 |
23:04:02.99 |
-68:09:19.5 |
HIP 113911 |
11.56 |
| 2026-05-14 12:00 |
23:04:03.94 |
-68:09:30.9 |
HIP 113911 |
11.37 |
| 2026-05-15 00:00 |
23:04:04.87 |
-68:09:42.4 |
HIP 113911 |
11.18 |
| 2026-05-15 12:00 |
23:04:05.78 |
-68:09:53.9 |
HIP 113911 |
10.99 |
| 2026-05-16 00:00 |
23:04:06.68 |
-68:10:05.5 |
HIP 113911 |
10.80 |
| 2026-05-16 12:00 |
23:04:07.55 |
-68:10:17.2 |
HIP 113911 |
10.60 |
| 2026-05-17 00:00 |
23:04:08.40 |
-68:10:28.9 |
HIP 113911 |
10.41 |
| 2026-05-17 12:00 |
23:04:09.23 |
-68:10:40.7 |
HIP 113911 |
10.22 |
| 2026-05-18 00:00 |
23:04:10.04 |
-68:10:52.6 |
HIP 113911 |
10.02 |
| 2026-05-18 12:00 |
23:04:10.83 |
-68:11:04.5 |
HIP 113911 |
9.83 |
| 2026-05-19 00:00 |
23:04:11.59 |
-68:11:16.5 |
HIP 113911 |
9.64 |
| 2026-05-19 12:00 |
23:04:12.34 |
-68:11:28.5 |
HIP 113911 |
9.44 |
| 2026-05-20 00:00 |
23:04:13.07 |
-68:11:40.6 |
HIP 113911 |
9.25 |
| 2026-05-20 12:00 |
23:04:13.78 |
-68:11:52.8 |
HIP 113911 |
9.05 |
| 2026-05-21 00:00 |
23:04:14.46 |
-68:12:05.0 |
HIP 113911 |
8.86 |
| 2026-05-21 12:00 |
23:04:15.13 |
-68:12:17.2 |
HIP 113911 |
8.66 |
| 2026-05-22 00:00 |
23:04:15.77 |
-68:12:29.5 |
HIP 113911 |
8.46 |
| 2026-05-22 12:00 |
23:04:16.40 |
-68:12:41.9 |
HIP 113911 |
8.27 |
| 2026-05-23 00:00 |
23:04:17.00 |
-68:12:54.3 |
HIP 113911 |
8.07 |
| 2026-05-23 12:00 |
23:04:17.58 |
-68:13:06.8 |
HIP 113911 |
7.87 |
| 2026-05-24 00:00 |
23:04:18.14 |
-68:13:19.3 |
HIP 113911 |
7.68 |
| 2026-05-24 12:00 |
23:04:18.68 |
-68:13:31.8 |
HIP 113911 |
7.48 |
| 2026-05-25 00:00 |
23:04:19.20 |
-68:13:44.4 |
HIP 113911 |
7.28 |
| 2026-05-25 12:00 |
23:04:19.70 |
-68:13:57.1 |
HIP 113911 |
7.08 |
| 2026-05-26 00:00 |
23:04:20.17 |
-68:14:09.8 |
HIP 113911 |
6.88 |
| 2026-05-26 12:00 |
23:04:20.63 |
-68:14:22.5 |
HIP 113911 |
6.69 |
| 2026-05-27 00:00 |
23:04:21.06 |
-68:14:35.3 |
HIP 113911 |
6.49 |
| 2026-05-27 12:00 |
23:04:21.47 |
-68:14:48.1 |
HIP 113911 |
6.29 |
| 2026-05-28 00:00 |
23:04:21.87 |
-68:15:01.0 |
HIP 113911 |
6.09 |
| 2026-05-28 12:00 |
23:04:22.24 |
-68:15:13.9 |
HIP 113911 |
5.90 |
| 2026-05-29 00:00 |
23:04:22.58 |
-68:15:26.8 |
HIP 113911 |
5.70 |
| 2026-05-29 12:00 |
23:04:22.91 |
-68:15:39.8 |
HIP 113911 |
5.50 |
| 2026-05-30 00:00 |
23:04:23.22 |
-68:15:52.9 |
HIP 113911 |
5.31 |
| 2026-05-30 12:00 |
23:04:23.50 |
-68:16:05.9 |
HIP 113911 |
5.11 |
| 2026-05-31 00:00 |
23:04:23.77 |
-68:16:19.0 |
HIP 113911 |
4.92 |
| 2026-05-31 12:00 |
23:04:24.01 |
-68:16:32.1 |
HIP 113911 |
4.72 |
| 2026-06-01 00:00 |
23:04:24.23 |
-68:16:45.3 |
HIP 113911 |
4.53 |
| 2026-06-01 12:00 |
23:04:24.43 |
-68:16:58.5 |
HIP 113911 |
4.34 |
| 2026-06-02 00:00 |
23:04:24.61 |
-68:17:11.7 |
HIP 113911 |
4.15 |