C/1955 N1 (Bakharev-Macfarlane-Krienke)
| Parameter |
Value |
| Designation |
C/1955 N1 (Bakharev-Macfarlane-Krienke) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1955-07-11T12:59:41.798400Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:12Z |
| Obs used |
28 |
| NEO |
- |
| M1 |
- |
| K1 |
- |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1955-08-16.0000000 |
| e |
0.99424862 |
| q (au) |
1.427452 |
| a (au) |
248.192798 |
| i (deg) |
50.033957 |
| Ω (om, deg) |
303.466133 |
| ω (w, deg) |
13.216239 |
| M (ma, deg) |
0.008938 |
Magnitude
Scatter + Global Linear
$$
M_a = (6.175 + 5.060\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
6.175 |
| n |
5.060 |
| gf |
0.800 |
| gb |
-0.500 |
| k |
1.000 |
| δ90 |
1.000 |
| 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 |
| 1955-07-13 |
1955-09-13 |
+0.5509 |
-0.010 |
| 1955-09-13 |
1955-11-23 |
+6.3738 |
-2.002 |
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 |
08:22:58.13 |
+19:11:25.7 |
HIP 41233 |
26.37 |
| 2026-02-03 12:00 |
08:22:56.79 |
+19:11:30.0 |
HIP 41233 |
26.69 |
| 2026-02-04 00:00 |
08:22:55.45 |
+19:11:34.2 |
HIP 41233 |
27.01 |
| 2026-02-04 12:00 |
08:22:54.11 |
+19:11:38.5 |
HIP 41233 |
27.32 |
| 2026-02-05 00:00 |
08:22:52.78 |
+19:11:42.7 |
HIP 41233 |
27.64 |
| 2026-02-05 12:00 |
08:22:51.44 |
+19:11:46.9 |
HIP 41233 |
27.96 |
| 2026-02-06 00:00 |
08:22:50.11 |
+19:11:51.2 |
HIP 41233 |
28.28 |
| 2026-02-06 12:00 |
08:22:48.79 |
+19:11:55.4 |
HIP 41233 |
28.60 |
| 2026-02-07 00:00 |
08:22:47.46 |
+19:11:59.6 |
HIP 41233 |
28.91 |
| 2026-02-07 12:00 |
08:22:46.14 |
+19:12:03.8 |
HIP 41233 |
29.23 |
| 2026-02-08 00:00 |
08:22:44.82 |
+19:12:07.9 |
HIP 41233 |
29.54 |
| 2026-02-08 12:00 |
08:22:43.51 |
+19:12:12.1 |
HIP 41233 |
29.86 |
| 2026-02-09 00:00 |
08:22:42.20 |
+19:12:16.3 |
HIP 41233 |
30.17 |
| 2026-02-09 12:00 |
08:22:40.89 |
+19:12:20.4 |
HIP 41233 |
30.48 |
| 2026-02-10 00:00 |
08:22:39.58 |
+19:12:24.6 |
HIP 41233 |
30.80 |
| 2026-02-10 12:00 |
08:22:38.28 |
+19:12:28.7 |
HIP 41233 |
31.11 |
| 2026-02-11 00:00 |
08:22:36.98 |
+19:12:32.8 |
HIP 41233 |
31.42 |
| 2026-02-11 12:00 |
08:22:35.69 |
+19:12:36.9 |
HIP 41233 |
31.73 |
| 2026-02-12 00:00 |
08:22:34.40 |
+19:12:41.0 |
HIP 41233 |
32.03 |
| 2026-02-12 12:00 |
08:22:33.12 |
+19:12:45.0 |
HIP 41233 |
32.34 |
| 2026-02-13 00:00 |
08:22:31.84 |
+19:12:49.1 |
HIP 41233 |
32.65 |
| 2026-02-13 12:00 |
08:22:30.56 |
+19:12:53.1 |
HIP 41233 |
32.96 |
| 2026-02-14 00:00 |
08:22:29.29 |
+19:12:57.2 |
HIP 41233 |
33.26 |
| 2026-02-14 12:00 |
08:22:28.02 |
+19:13:01.2 |
HIP 41233 |
33.56 |
| 2026-02-15 00:00 |
08:22:26.75 |
+19:13:05.2 |
HIP 41233 |
33.87 |
| 2026-02-15 12:00 |
08:22:25.50 |
+19:13:09.2 |
HIP 41233 |
34.17 |
| 2026-02-16 00:00 |
08:22:24.24 |
+19:13:13.1 |
HIP 41233 |
34.47 |
| 2026-02-16 12:00 |
08:22:22.99 |
+19:13:17.1 |
HIP 41233 |
34.77 |
| 2026-02-17 00:00 |
08:22:21.75 |
+19:13:21.0 |
HIP 41233 |
35.07 |
| 2026-02-17 12:00 |
08:22:20.51 |
+19:13:24.9 |
HIP 41233 |
35.36 |
| 2026-02-18 00:00 |
08:22:19.28 |
+19:13:28.8 |
HIP 40836 |
35.29 |
| 2026-02-18 12:00 |
08:22:18.05 |
+19:13:32.7 |
HIP 40836 |
35.00 |
| 2026-02-19 00:00 |
08:22:16.82 |
+19:13:36.6 |
HIP 40836 |
34.71 |
| 2026-02-19 12:00 |
08:22:15.61 |
+19:13:40.4 |
HIP 40836 |
34.42 |
| 2026-02-20 00:00 |
08:22:14.40 |
+19:13:44.2 |
HIP 40836 |
34.13 |
| 2026-02-20 12:00 |
08:22:13.19 |
+19:13:48.0 |
HIP 40836 |
33.84 |
| 2026-02-21 00:00 |
08:22:11.99 |
+19:13:51.8 |
HIP 40836 |
33.56 |
| 2026-02-21 12:00 |
08:22:10.80 |
+19:13:55.6 |
HIP 40836 |
33.28 |
| 2026-02-22 00:00 |
08:22:09.61 |
+19:13:59.3 |
HIP 40836 |
32.99 |
| 2026-02-22 12:00 |
08:22:08.42 |
+19:14:03.0 |
HIP 40836 |
32.71 |
| 2026-02-23 00:00 |
08:22:07.25 |
+19:14:06.7 |
HIP 40836 |
32.43 |
| 2026-02-23 12:00 |
08:22:06.08 |
+19:14:10.4 |
HIP 40836 |
32.16 |
| 2026-02-24 00:00 |
08:22:04.92 |
+19:14:14.1 |
HIP 40836 |
31.88 |