메타데이터
| 항목 |
값 |
| Designation |
C/2017 M5 (TOTAS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2018-06-02T22:39:17.565120Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:35Z |
| Obs used |
461 |
| NEO |
- |
| M1 |
6.600 |
| K1 |
10.750 |
| PC |
0.030 |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2018-04-23.0000000 |
| e |
1.00373842 |
| q (au) |
5.989567 |
| a (au) |
-1602.163329 |
| i (deg) |
15.884843 |
| Ω (om, deg) |
216.263268 |
| ω (w, deg) |
92.657463 |
| M (ma, deg) |
-0.000629 |
밝기
산란 + 전체 선형
$$
M_a = (2.460 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
2.460 |
| n |
6.000 |
| gf |
0.895 |
| gb |
-0.884 |
| k |
1.000 |
| δ90 |
3.916 |
| 파라미터 |
기호 |
범위 |
설명 |
| 태양·지구거리 1 AU에서의 절대등급 |
H0 |
-5 to 20 |
혜성의 고유 밝기 |
| 광도 기울기 파라미터 |
n |
2 to 6 |
태양거리 변화에 따른 밝기 변화율 |
| 전방 산란 비대칭 계수 |
gf |
0.8 to 1 |
전방 산란의 강도 |
| 후방 산란 비대칭 계수 |
gb |
-1 to -0.5 |
후방 산란의 강도 |
| 분할 계수 |
k |
0.8 to 1 |
전·후방 산란 기여도 비율 |
| 먼지/가스 밝기 비 |
δ90 |
1 to 10 |
코마에서 먼지 산란 대비 가스 방출의 상대 기여 |
참고: EPSC-DPS2025-160
잔차 (구간 선형)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 시작일 (UTC) |
끝 (UTC) |
a |
b |
| 2016-03-06 |
2018-05-22 |
+9.8447 |
-8.185 |
| 2018-08-08 |
2019-12-02 |
+11.7630 |
-9.198 |
log10 r = log10(태양거리/AU), Δ = 지구거리(AU)
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
04:03:57.52 |
+14:31:26.2 |
HIP 18902 |
12.57 |
| 2026-07-29 12:00 |
04:04:01.42 |
+14:31:24.0 |
HIP 18902 |
13.49 |
| 2026-07-30 00:00 |
04:04:05.28 |
+14:31:21.7 |
HIP 18902 |
14.41 |
| 2026-07-30 12:00 |
04:04:09.10 |
+14:31:19.1 |
HIP 18902 |
15.31 |
| 2026-07-31 00:00 |
04:04:12.87 |
+14:31:16.4 |
HIP 18902 |
16.21 |
| 2026-07-31 12:00 |
04:04:16.60 |
+14:31:13.5 |
HIP 18902 |
17.10 |
| 2026-08-01 00:00 |
04:04:20.28 |
+14:31:10.5 |
HIP 18902 |
17.97 |
| 2026-08-01 12:00 |
04:04:23.92 |
+14:31:07.2 |
HIP 18902 |
18.84 |
| 2026-08-02 00:00 |
04:04:27.51 |
+14:31:03.8 |
HIP 18902 |
19.70 |
| 2026-08-02 12:00 |
04:04:31.05 |
+14:31:00.2 |
HIP 19085 |
20.06 |
| 2026-08-03 00:00 |
04:04:34.55 |
+14:30:56.4 |
HIP 19085 |
19.41 |
| 2026-08-03 12:00 |
04:04:38.00 |
+14:30:52.5 |
HIP 19085 |
18.79 |
| 2026-08-04 00:00 |
04:04:41.41 |
+14:30:48.4 |
HIP 19085 |
18.18 |
| 2026-08-04 12:00 |
04:04:44.77 |
+14:30:44.1 |
HIP 19085 |
17.60 |
| 2026-08-05 00:00 |
04:04:48.08 |
+14:30:39.6 |
HIP 19085 |
17.04 |
| 2026-08-05 12:00 |
04:04:51.34 |
+14:30:35.0 |
HIP 19085 |
16.50 |
| 2026-08-06 00:00 |
04:04:54.56 |
+14:30:30.2 |
HIP 19085 |
15.99 |
| 2026-08-06 12:00 |
04:04:57.73 |
+14:30:25.2 |
HIP 19085 |
15.51 |
| 2026-08-07 00:00 |
04:05:00.85 |
+14:30:20.0 |
HIP 19085 |
15.05 |
| 2026-08-07 12:00 |
04:05:03.92 |
+14:30:14.7 |
HIP 19085 |
14.63 |
| 2026-08-08 00:00 |
04:05:06.95 |
+14:30:09.1 |
HIP 19085 |
14.23 |
| 2026-08-08 12:00 |
04:05:09.93 |
+14:30:03.4 |
HIP 19085 |
13.86 |
| 2026-08-09 00:00 |
04:05:12.85 |
+14:29:57.6 |
HIP 19085 |
13.52 |
| 2026-08-09 12:00 |
04:05:15.73 |
+14:29:51.5 |
HIP 19085 |
13.21 |
| 2026-08-10 00:00 |
04:05:18.56 |
+14:29:45.3 |
HIP 19085 |
12.93 |
| 2026-08-10 12:00 |
04:05:21.34 |
+14:29:38.9 |
HIP 19085 |
12.69 |
| 2026-08-11 00:00 |
04:05:24.07 |
+14:29:32.3 |
HIP 19085 |
12.47 |
| 2026-08-11 12:00 |
04:05:26.75 |
+14:29:25.6 |
HIP 19085 |
12.29 |
| 2026-08-12 00:00 |
04:05:29.39 |
+14:29:18.7 |
HIP 19085 |
12.14 |
| 2026-08-12 12:00 |
04:05:31.97 |
+14:29:11.6 |
HIP 19085 |
12.01 |
| 2026-08-13 00:00 |
04:05:34.50 |
+14:29:04.3 |
HIP 19085 |
11.92 |
| 2026-08-13 12:00 |
04:05:36.98 |
+14:28:56.9 |
HIP 19085 |
11.85 |
| 2026-08-14 00:00 |
04:05:39.41 |
+14:28:49.3 |
HIP 19157 |
11.52 |
| 2026-08-14 12:00 |
04:05:41.78 |
+14:28:41.5 |
HIP 19157 |
10.94 |
| 2026-08-15 00:00 |
04:05:44.11 |
+14:28:33.6 |
HIP 19157 |
10.38 |
| 2026-08-15 12:00 |
04:05:46.39 |
+14:28:25.5 |
HIP 19157 |
9.82 |
| 2026-08-16 00:00 |
04:05:48.61 |
+14:28:17.2 |
HIP 19157 |
9.28 |
| 2026-08-16 12:00 |
04:05:50.79 |
+14:28:08.7 |
HIP 19157 |
8.74 |
| 2026-08-17 00:00 |
04:05:52.91 |
+14:28:00.1 |
HIP 19157 |
8.22 |
| 2026-08-17 12:00 |
04:05:54.98 |
+14:27:51.3 |
HIP 19157 |
7.71 |
| 2026-08-18 00:00 |
04:05:57.00 |
+14:27:42.4 |
HIP 19157 |
7.21 |
| 2026-08-18 12:00 |
04:05:58.97 |
+14:27:33.2 |
HIP 19157 |
6.72 |
| 2026-08-19 00:00 |
04:06:00.88 |
+14:27:23.9 |
HIP 19157 |
6.25 |