| Parameter |
Value |
| Designation |
C/1952 M1 (Peltier) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1952-07-15T06:06:23.693760Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:10Z |
| Obs used |
30 |
| NEO |
- |
| M1 |
9.100 |
| K1 |
23.000 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1952-08-08.0000000 |
| e |
0.99975208 |
| q (au) |
1.201937 |
| a (au) |
4848.007632 |
| i (deg) |
45.552738 |
| Ω (om, deg) |
188.643743 |
| ω (w, deg) |
96.584082 |
| M (ma, deg) |
0.000069 |
Magnitude
Scatter + Global Linear
$$
M_a = (8.443 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
8.443 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.500 |
| 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
Residuals (Piecewise)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| Start (UTC) |
End (UTC) |
a |
b |
| 1952-07-15 |
1952-11-20 |
+11.5410 |
-1.417 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
06:01:33.30 |
-21:22:48.3 |
HIP 28486 |
17.22 |
| 2026-07-29 12:00 |
06:01:34.36 |
-21:22:55.7 |
HIP 28486 |
17.46 |
| 2026-07-30 00:00 |
06:01:35.40 |
-21:23:03.2 |
HIP 28486 |
17.71 |
| 2026-07-30 12:00 |
06:01:36.45 |
-21:23:10.8 |
HIP 28486 |
17.96 |
| 2026-07-31 00:00 |
06:01:37.48 |
-21:23:18.5 |
HIP 28486 |
18.20 |
| 2026-07-31 12:00 |
06:01:38.51 |
-21:23:26.2 |
HIP 28486 |
18.45 |
| 2026-08-01 00:00 |
06:01:39.53 |
-21:23:34.1 |
HIP 28486 |
18.70 |
| 2026-08-01 12:00 |
06:01:40.55 |
-21:23:42.0 |
HIP 28486 |
18.95 |
| 2026-08-02 00:00 |
06:01:41.56 |
-21:23:50.0 |
HIP 28486 |
19.21 |
| 2026-08-02 12:00 |
06:01:42.56 |
-21:23:58.1 |
HIP 28486 |
19.46 |
| 2026-08-03 00:00 |
06:01:43.56 |
-21:24:06.3 |
HIP 28486 |
19.71 |
| 2026-08-03 12:00 |
06:01:44.55 |
-21:24:14.5 |
HIP 28486 |
19.96 |
| 2026-08-04 00:00 |
06:01:45.53 |
-21:24:22.9 |
HIP 28486 |
20.22 |
| 2026-08-04 12:00 |
06:01:46.50 |
-21:24:31.3 |
HIP 28486 |
20.47 |
| 2026-08-05 00:00 |
06:01:47.47 |
-21:24:39.8 |
HIP 28486 |
20.72 |
| 2026-08-05 12:00 |
06:01:48.43 |
-21:24:48.4 |
HIP 28486 |
20.98 |
| 2026-08-06 00:00 |
06:01:49.39 |
-21:24:57.0 |
HIP 28486 |
21.23 |
| 2026-08-06 12:00 |
06:01:50.34 |
-21:25:05.8 |
HIP 28486 |
21.49 |
| 2026-08-07 00:00 |
06:01:51.27 |
-21:25:14.6 |
HIP 28486 |
21.74 |
| 2026-08-07 12:00 |
06:01:52.21 |
-21:25:23.5 |
HIP 28486 |
22.00 |
| 2026-08-08 00:00 |
06:01:53.13 |
-21:25:32.5 |
HIP 28486 |
22.25 |
| 2026-08-08 12:00 |
06:01:54.05 |
-21:25:41.5 |
HIP 28486 |
22.51 |
| 2026-08-09 00:00 |
06:01:54.96 |
-21:25:50.6 |
HIP 28486 |
22.76 |
| 2026-08-09 12:00 |
06:01:55.86 |
-21:25:59.8 |
HIP 28486 |
23.02 |
| 2026-08-10 00:00 |
06:01:56.76 |
-21:26:09.1 |
HIP 28486 |
23.27 |
| 2026-08-10 12:00 |
06:01:57.64 |
-21:26:18.5 |
HIP 28486 |
23.52 |
| 2026-08-11 00:00 |
06:01:58.52 |
-21:26:27.9 |
HIP 28486 |
23.78 |
| 2026-08-11 12:00 |
06:01:59.39 |
-21:26:37.4 |
HIP 28486 |
24.03 |
| 2026-08-12 00:00 |
06:02:00.25 |
-21:26:46.9 |
HIP 28486 |
24.28 |
| 2026-08-12 12:00 |
06:02:01.11 |
-21:26:56.6 |
HIP 28486 |
24.54 |
| 2026-08-13 00:00 |
06:02:01.96 |
-21:27:06.3 |
HIP 28486 |
24.79 |
| 2026-08-13 12:00 |
06:02:02.79 |
-21:27:16.1 |
HIP 28486 |
25.04 |
| 2026-08-14 00:00 |
06:02:03.62 |
-21:27:25.9 |
HIP 28486 |
25.29 |
| 2026-08-14 12:00 |
06:02:04.45 |
-21:27:35.8 |
HIP 28486 |
25.54 |
| 2026-08-15 00:00 |
06:02:05.26 |
-21:27:45.8 |
HIP 28486 |
25.80 |
| 2026-08-15 12:00 |
06:02:06.06 |
-21:27:55.9 |
HIP 28486 |
26.05 |
| 2026-08-16 00:00 |
06:02:06.86 |
-21:28:06.0 |
HIP 28486 |
26.30 |
| 2026-08-16 12:00 |
06:02:07.65 |
-21:28:16.2 |
HIP 28687 |
26.25 |
| 2026-08-17 00:00 |
06:02:08.43 |
-21:28:26.4 |
HIP 28687 |
26.00 |
| 2026-08-17 12:00 |
06:02:09.20 |
-21:28:36.7 |
HIP 28687 |
25.75 |
| 2026-08-18 00:00 |
06:02:09.96 |
-21:28:47.1 |
HIP 28687 |
25.51 |
| 2026-08-18 12:00 |
06:02:10.71 |
-21:28:57.6 |
HIP 28687 |
25.26 |
| 2026-08-19 00:00 |
06:02:11.45 |
-21:29:08.1 |
HIP 28687 |
25.01 |