C/1954 M2 (Kresak-Peltier)
| Parameter |
Value |
| Designation |
C/1954 M2 (Kresak-Peltier) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1954-08-29T16:00:13.749120Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:12Z |
| Obs used |
10 |
| NEO |
- |
| M1 |
- |
| K1 |
- |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1954-08-03.0000000 |
| e |
1.00022617 |
| q (au) |
0.746369 |
| a (au) |
-3300.044138 |
| i (deg) |
88.539550 |
| Ω (om, deg) |
75.566452 |
| ω (w, deg) |
254.728144 |
| M (ma, deg) |
-0.000139 |
Magnitude
Scatter + Global Linear
$$
M_a = (7.972 + 3.248\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
7.972 |
| n |
3.248 |
| 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 |
| 1954-06-29 |
1954-08-28 |
-1.1747 |
+0.034 |
| 1954-09-07 |
1954-11-28 |
+7.8959 |
+0.329 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
00:53:11.89 |
+84:34:46.9 |
HIP 4965 |
14.87 |
| 2026-02-03 12:00 |
00:53:17.70 |
+84:34:31.6 |
HIP 4965 |
14.77 |
| 2026-02-04 00:00 |
00:53:23.58 |
+84:34:16.4 |
HIP 4965 |
14.67 |
| 2026-02-04 12:00 |
00:53:29.55 |
+84:34:01.3 |
HIP 4965 |
14.58 |
| 2026-02-05 00:00 |
00:53:35.61 |
+84:33:46.3 |
HIP 4965 |
14.49 |
| 2026-02-05 12:00 |
00:53:41.74 |
+84:33:31.4 |
HIP 4965 |
14.40 |
| 2026-02-06 00:00 |
00:53:47.95 |
+84:33:16.5 |
HIP 4965 |
14.31 |
| 2026-02-06 12:00 |
00:53:54.24 |
+84:33:01.8 |
HIP 4965 |
14.23 |
| 2026-02-07 00:00 |
00:54:00.61 |
+84:32:47.2 |
HIP 4965 |
14.15 |
| 2026-02-07 12:00 |
00:54:07.06 |
+84:32:32.6 |
HIP 4965 |
14.07 |
| 2026-02-08 00:00 |
00:54:13.59 |
+84:32:18.1 |
HIP 4965 |
14.00 |
| 2026-02-08 12:00 |
00:54:20.20 |
+84:32:03.8 |
HIP 4965 |
13.92 |
| 2026-02-09 00:00 |
00:54:26.88 |
+84:31:49.5 |
HIP 4965 |
13.86 |
| 2026-02-09 12:00 |
00:54:33.64 |
+84:31:35.4 |
HIP 4965 |
13.79 |
| 2026-02-10 00:00 |
00:54:40.47 |
+84:31:21.3 |
HIP 4965 |
13.73 |
| 2026-02-10 12:00 |
00:54:47.38 |
+84:31:07.3 |
HIP 4965 |
13.67 |
| 2026-02-11 00:00 |
00:54:54.36 |
+84:30:53.5 |
HIP 4965 |
13.61 |
| 2026-02-11 12:00 |
00:55:01.42 |
+84:30:39.7 |
HIP 4965 |
13.56 |
| 2026-02-12 00:00 |
00:55:08.55 |
+84:30:26.0 |
HIP 4965 |
13.51 |
| 2026-02-12 12:00 |
00:55:15.75 |
+84:30:12.5 |
HIP 4965 |
13.46 |
| 2026-02-13 00:00 |
00:55:23.02 |
+84:29:59.0 |
HIP 4965 |
13.42 |
| 2026-02-13 12:00 |
00:55:30.37 |
+84:29:45.7 |
HIP 4965 |
13.38 |
| 2026-02-14 00:00 |
00:55:37.79 |
+84:29:32.4 |
HIP 4965 |
13.34 |
| 2026-02-14 12:00 |
00:55:45.28 |
+84:29:19.3 |
HIP 4965 |
13.31 |
| 2026-02-15 00:00 |
00:55:52.83 |
+84:29:06.3 |
HIP 4965 |
13.28 |
| 2026-02-15 12:00 |
00:56:00.46 |
+84:28:53.4 |
HIP 4965 |
13.25 |
| 2026-02-16 00:00 |
00:56:08.15 |
+84:28:40.6 |
HIP 4965 |
13.23 |
| 2026-02-16 12:00 |
00:56:15.91 |
+84:28:27.9 |
HIP 4965 |
13.21 |
| 2026-02-17 00:00 |
00:56:23.74 |
+84:28:15.3 |
HIP 4965 |
13.19 |
| 2026-02-17 12:00 |
00:56:31.64 |
+84:28:02.8 |
HIP 4965 |
13.18 |
| 2026-02-18 00:00 |
00:56:39.60 |
+84:27:50.5 |
HIP 4965 |
13.17 |
| 2026-02-18 12:00 |
00:56:47.62 |
+84:27:38.2 |
HIP 4965 |
13.16 |
| 2026-02-19 00:00 |
00:56:55.71 |
+84:27:26.1 |
HIP 4965 |
13.16 |
| 2026-02-19 12:00 |
00:57:03.86 |
+84:27:14.1 |
HIP 4965 |
13.16 |
| 2026-02-20 00:00 |
00:57:12.08 |
+84:27:02.2 |
HIP 4965 |
13.16 |
| 2026-02-20 12:00 |
00:57:20.36 |
+84:26:50.4 |
HIP 4965 |
13.17 |
| 2026-02-21 00:00 |
00:57:28.69 |
+84:26:38.8 |
HIP 4965 |
13.17 |
| 2026-02-21 12:00 |
00:57:37.09 |
+84:26:27.3 |
HIP 4965 |
13.19 |
| 2026-02-22 00:00 |
00:57:45.55 |
+84:26:15.8 |
HIP 4965 |
13.20 |
| 2026-02-22 12:00 |
00:57:54.07 |
+84:26:04.5 |
HIP 4965 |
13.22 |
| 2026-02-23 00:00 |
00:58:02.65 |
+84:25:53.4 |
HIP 4965 |
13.24 |
| 2026-02-23 12:00 |
00:58:11.29 |
+84:25:42.3 |
HIP 4965 |
13.27 |
| 2026-02-24 00:00 |
00:58:19.98 |
+84:25:31.4 |
HIP 4965 |
13.30 |