| 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) |
| 2026-05-12 00:00 |
08:20:58.43 |
+19:17:21.9 |
HIP 40836 |
16.65 |
| 2026-05-12 12:00 |
08:20:58.84 |
+19:17:20.3 |
HIP 40836 |
16.75 |
| 2026-05-13 00:00 |
08:20:59.27 |
+19:17:18.7 |
HIP 40836 |
16.84 |
| 2026-05-13 12:00 |
08:20:59.70 |
+19:17:17.0 |
HIP 40836 |
16.94 |
| 2026-05-14 00:00 |
08:21:00.14 |
+19:17:15.3 |
HIP 40836 |
17.04 |
| 2026-05-14 12:00 |
08:21:00.59 |
+19:17:13.6 |
HIP 40836 |
17.15 |
| 2026-05-15 00:00 |
08:21:01.06 |
+19:17:11.8 |
HIP 40836 |
17.25 |
| 2026-05-15 12:00 |
08:21:01.53 |
+19:17:10.0 |
HIP 40836 |
17.36 |
| 2026-05-16 00:00 |
08:21:02.02 |
+19:17:08.2 |
HIP 40836 |
17.47 |
| 2026-05-16 12:00 |
08:21:02.51 |
+19:17:06.3 |
HIP 40836 |
17.59 |
| 2026-05-17 00:00 |
08:21:03.02 |
+19:17:04.4 |
HIP 40836 |
17.70 |
| 2026-05-17 12:00 |
08:21:03.53 |
+19:17:02.5 |
HIP 40836 |
17.82 |
| 2026-05-18 00:00 |
08:21:04.06 |
+19:17:00.5 |
HIP 40836 |
17.94 |
| 2026-05-18 12:00 |
08:21:04.59 |
+19:16:58.5 |
HIP 40836 |
18.07 |
| 2026-05-19 00:00 |
08:21:05.14 |
+19:16:56.4 |
HIP 40836 |
18.19 |
| 2026-05-19 12:00 |
08:21:05.69 |
+19:16:54.4 |
HIP 40836 |
18.32 |
| 2026-05-20 00:00 |
08:21:06.26 |
+19:16:52.3 |
HIP 40836 |
18.45 |
| 2026-05-20 12:00 |
08:21:06.84 |
+19:16:50.1 |
HIP 40836 |
18.58 |
| 2026-05-21 00:00 |
08:21:07.42 |
+19:16:47.9 |
HIP 40836 |
18.72 |
| 2026-05-21 12:00 |
08:21:08.02 |
+19:16:45.7 |
HIP 40836 |
18.85 |
| 2026-05-22 00:00 |
08:21:08.63 |
+19:16:43.5 |
HIP 40836 |
18.99 |
| 2026-05-22 12:00 |
08:21:09.24 |
+19:16:41.2 |
HIP 40836 |
19.14 |
| 2026-05-23 00:00 |
08:21:09.87 |
+19:16:38.9 |
HIP 40836 |
19.28 |
| 2026-05-23 12:00 |
08:21:10.50 |
+19:16:36.5 |
HIP 40836 |
19.43 |
| 2026-05-24 00:00 |
08:21:11.15 |
+19:16:34.1 |
HIP 40836 |
19.58 |
| 2026-05-24 12:00 |
08:21:11.80 |
+19:16:31.7 |
HIP 40836 |
19.73 |
| 2026-05-25 00:00 |
08:21:12.47 |
+19:16:29.3 |
HIP 40836 |
19.88 |
| 2026-05-25 12:00 |
08:21:13.14 |
+19:16:26.8 |
HIP 40836 |
20.04 |
| 2026-05-26 00:00 |
08:21:13.82 |
+19:16:24.3 |
HIP 40836 |
20.20 |
| 2026-05-26 12:00 |
08:21:14.52 |
+19:16:21.8 |
HIP 40836 |
20.36 |
| 2026-05-27 00:00 |
08:21:15.22 |
+19:16:19.2 |
HIP 40836 |
20.52 |
| 2026-05-27 12:00 |
08:21:15.93 |
+19:16:16.6 |
HIP 40836 |
20.69 |
| 2026-05-28 00:00 |
08:21:16.65 |
+19:16:14.0 |
HIP 40836 |
20.85 |
| 2026-05-28 12:00 |
08:21:17.38 |
+19:16:11.3 |
HIP 40836 |
21.02 |
| 2026-05-29 00:00 |
08:21:18.11 |
+19:16:08.6 |
HIP 40836 |
21.20 |
| 2026-05-29 12:00 |
08:21:18.86 |
+19:16:05.9 |
HIP 40836 |
21.37 |
| 2026-05-30 00:00 |
08:21:19.62 |
+19:16:03.1 |
HIP 40836 |
21.55 |
| 2026-05-30 12:00 |
08:21:20.38 |
+19:16:00.3 |
HIP 40836 |
21.72 |
| 2026-05-31 00:00 |
08:21:21.16 |
+19:15:57.5 |
HIP 40836 |
21.91 |
| 2026-05-31 12:00 |
08:21:21.94 |
+19:15:54.7 |
HIP 40836 |
22.09 |
| 2026-06-01 00:00 |
08:21:22.73 |
+19:15:51.8 |
HIP 40836 |
22.27 |
| 2026-06-01 12:00 |
08:21:23.53 |
+19:15:48.9 |
HIP 40836 |
22.46 |
| 2026-06-02 00:00 |
08:21:24.34 |
+19:15:45.9 |
HIP 40836 |
22.65 |