| 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) |
| 2026-03-26 00:00 |
05:57:27.83 |
-21:40:59.7 |
HIP 28284 |
17.79 |
| 2026-03-26 12:00 |
05:57:27.96 |
-21:40:46.8 |
HIP 28284 |
17.66 |
| 2026-03-27 00:00 |
05:57:28.11 |
-21:40:34.0 |
HIP 28284 |
17.53 |
| 2026-03-27 12:00 |
05:57:28.27 |
-21:40:21.1 |
HIP 28284 |
17.40 |
| 2026-03-28 00:00 |
05:57:28.43 |
-21:40:08.3 |
HIP 28284 |
17.27 |
| 2026-03-28 12:00 |
05:57:28.61 |
-21:39:55.4 |
HIP 28284 |
17.14 |
| 2026-03-29 00:00 |
05:57:28.80 |
-21:39:42.6 |
HIP 28284 |
17.01 |
| 2026-03-29 12:00 |
05:57:29.01 |
-21:39:29.8 |
HIP 28284 |
16.88 |
| 2026-03-30 00:00 |
05:57:29.22 |
-21:39:17.1 |
HIP 28284 |
16.75 |
| 2026-03-30 12:00 |
05:57:29.44 |
-21:39:04.3 |
HIP 28284 |
16.62 |
| 2026-03-31 00:00 |
05:57:29.68 |
-21:38:51.6 |
HIP 28284 |
16.49 |
| 2026-03-31 12:00 |
05:57:29.92 |
-21:38:38.9 |
HIP 28284 |
16.36 |
| 2026-04-01 00:00 |
05:57:30.18 |
-21:38:26.2 |
HIP 28284 |
16.23 |
| 2026-04-01 12:00 |
05:57:30.45 |
-21:38:13.5 |
HIP 28284 |
16.09 |
| 2026-04-02 00:00 |
05:57:30.73 |
-21:38:00.9 |
HIP 28284 |
15.96 |
| 2026-04-02 12:00 |
05:57:31.02 |
-21:37:48.3 |
HIP 28284 |
15.83 |
| 2026-04-03 00:00 |
05:57:31.32 |
-21:37:35.7 |
HIP 28284 |
15.69 |
| 2026-04-03 12:00 |
05:57:31.63 |
-21:37:23.2 |
HIP 28284 |
15.56 |
| 2026-04-04 00:00 |
05:57:31.95 |
-21:37:10.6 |
HIP 28284 |
15.43 |
| 2026-04-04 12:00 |
05:57:32.28 |
-21:36:58.1 |
HIP 28284 |
15.29 |
| 2026-04-05 00:00 |
05:57:32.63 |
-21:36:45.7 |
HIP 28284 |
15.16 |
| 2026-04-05 12:00 |
05:57:32.98 |
-21:36:33.2 |
HIP 28284 |
15.02 |
| 2026-04-06 00:00 |
05:57:33.35 |
-21:36:20.8 |
HIP 28284 |
14.89 |
| 2026-04-06 12:00 |
05:57:33.72 |
-21:36:08.4 |
HIP 28284 |
14.75 |
| 2026-04-07 00:00 |
05:57:34.11 |
-21:35:56.1 |
HIP 28284 |
14.62 |
| 2026-04-07 12:00 |
05:57:34.51 |
-21:35:43.8 |
HIP 28284 |
14.49 |
| 2026-04-08 00:00 |
05:57:34.91 |
-21:35:31.5 |
HIP 28284 |
14.35 |
| 2026-04-08 12:00 |
05:57:35.33 |
-21:35:19.3 |
HIP 28284 |
14.22 |
| 2026-04-09 00:00 |
05:57:35.76 |
-21:35:07.0 |
HIP 28284 |
14.08 |
| 2026-04-09 12:00 |
05:57:36.20 |
-21:34:54.9 |
HIP 28284 |
13.95 |
| 2026-04-10 00:00 |
05:57:36.65 |
-21:34:42.7 |
HIP 28284 |
13.81 |
| 2026-04-10 12:00 |
05:57:37.11 |
-21:34:30.7 |
HIP 28284 |
13.68 |
| 2026-04-11 00:00 |
05:57:37.58 |
-21:34:18.6 |
HIP 28284 |
13.54 |
| 2026-04-11 12:00 |
05:57:38.06 |
-21:34:06.6 |
HIP 28284 |
13.41 |
| 2026-04-12 00:00 |
05:57:38.55 |
-21:33:54.6 |
HIP 28284 |
13.27 |
| 2026-04-12 12:00 |
05:57:39.05 |
-21:33:42.7 |
HIP 28284 |
13.14 |
| 2026-04-13 00:00 |
05:57:39.57 |
-21:33:30.8 |
HIP 28284 |
13.01 |
| 2026-04-13 12:00 |
05:57:40.09 |
-21:33:19.0 |
HIP 28284 |
12.87 |
| 2026-04-14 00:00 |
05:57:40.62 |
-21:33:07.2 |
HIP 28284 |
12.74 |
| 2026-04-14 12:00 |
05:57:41.16 |
-21:32:55.4 |
HIP 28284 |
12.61 |
| 2026-04-15 00:00 |
05:57:41.71 |
-21:32:43.7 |
HIP 28284 |
12.48 |
| 2026-04-15 12:00 |
05:57:42.28 |
-21:32:32.1 |
HIP 28284 |
12.35 |
| 2026-04-16 00:00 |
05:57:42.85 |
-21:32:20.5 |
HIP 28284 |
12.22 |