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
$$
M_a = (2.478 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
2.478 |
| n |
6.000 |
| gf |
0.801 |
| gb |
-0.884 |
| k |
1.000 |
| δ90 |
3.757 |
| 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 |
+11.7631 |
-9.198 |
log10 r = log10(태양거리/AU), Δ = 지구거리(AU)
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-03-26 00:00 |
03:37:34.51 |
+13:30:43.4 |
HIP 16991 |
15.07 |
| 2026-03-26 12:00 |
03:37:39.71 |
+13:31:04.2 |
HIP 16991 |
13.77 |
| 2026-03-27 00:00 |
03:37:44.95 |
+13:31:25.1 |
HIP 16991 |
12.46 |
| 2026-03-27 12:00 |
03:37:50.22 |
+13:31:46.1 |
HIP 16991 |
11.15 |
| 2026-03-28 00:00 |
03:37:55.53 |
+13:32:07.1 |
HIP 16991 |
9.83 |
| 2026-03-28 12:00 |
03:38:00.88 |
+13:32:28.1 |
HIP 16991 |
8.51 |
| 2026-03-29 00:00 |
03:38:06.27 |
+13:32:49.2 |
HIP 16991 |
7.19 |
| 2026-03-29 12:00 |
03:38:11.69 |
+13:33:10.4 |
HIP 16991 |
5.88 |
| 2026-03-30 00:00 |
03:38:17.15 |
+13:33:31.7 |
HIP 16991 |
4.60 |
| 2026-03-30 12:00 |
03:38:22.64 |
+13:33:53.0 |
HIP 16991 |
3.37 |
| 2026-03-31 00:00 |
03:38:28.17 |
+13:34:14.3 |
HIP 16991 |
2.33 |
| 2026-03-31 12:00 |
03:38:33.73 |
+13:34:35.7 |
HIP 16991 |
1.82 |
| 2026-04-01 00:00 |
03:38:39.32 |
+13:34:57.2 |
HIP 16991 |
2.27 |
| 2026-04-01 12:00 |
03:38:44.95 |
+13:35:18.7 |
HIP 16991 |
3.32 |
| 2026-04-02 00:00 |
03:38:50.62 |
+13:35:40.2 |
HIP 16991 |
4.58 |
| 2026-04-02 12:00 |
03:38:56.32 |
+13:36:01.8 |
HIP 17031 |
5.31 |
| 2026-04-03 00:00 |
03:39:02.05 |
+13:36:23.4 |
HIP 17031 |
4.62 |
| 2026-04-03 12:00 |
03:39:07.81 |
+13:36:45.1 |
HIP 17031 |
4.31 |
| 2026-04-04 00:00 |
03:39:13.61 |
+13:37:06.8 |
HIP 17031 |
4.48 |
| 2026-04-04 12:00 |
03:39:19.44 |
+13:37:28.6 |
HIP 17031 |
5.08 |
| 2026-04-05 00:00 |
03:39:25.30 |
+13:37:50.4 |
HIP 17031 |
5.99 |
| 2026-04-05 12:00 |
03:39:31.19 |
+13:38:12.2 |
HIP 17031 |
7.10 |
| 2026-04-06 00:00 |
03:39:37.11 |
+13:38:34.1 |
HIP 17031 |
8.33 |
| 2026-04-06 12:00 |
03:39:43.07 |
+13:38:56.0 |
HIP 17031 |
9.64 |
| 2026-04-07 00:00 |
03:39:49.05 |
+13:39:17.9 |
HIP 17031 |
11.00 |
| 2026-04-07 12:00 |
03:39:55.07 |
+13:39:39.9 |
HIP 17031 |
12.40 |
| 2026-04-08 00:00 |
03:40:01.11 |
+13:40:01.8 |
HIP 17031 |
13.84 |
| 2026-04-08 12:00 |
03:40:07.19 |
+13:40:23.9 |
HIP 17031 |
15.29 |
| 2026-04-09 00:00 |
03:40:13.30 |
+13:40:45.9 |
HIP 17031 |
16.76 |
| 2026-04-09 12:00 |
03:40:19.43 |
+13:41:08.0 |
HIP 17031 |
18.25 |
| 2026-04-10 00:00 |
03:40:25.59 |
+13:41:30.0 |
HIP 17238 |
18.54 |
| 2026-04-10 12:00 |
03:40:31.78 |
+13:41:52.1 |
HIP 17238 |
17.52 |
| 2026-04-11 00:00 |
03:40:38.00 |
+13:42:14.3 |
HIP 17238 |
16.57 |
| 2026-04-11 12:00 |
03:40:44.25 |
+13:42:36.4 |
HIP 17238 |
15.71 |
| 2026-04-12 00:00 |
03:40:50.52 |
+13:42:58.6 |
HIP 17238 |
14.96 |
| 2026-04-12 12:00 |
03:40:56.83 |
+13:43:20.7 |
HIP 17238 |
14.35 |
| 2026-04-13 00:00 |
03:41:03.15 |
+13:43:42.9 |
HIP 17238 |
13.88 |
| 2026-04-13 12:00 |
03:41:09.51 |
+13:44:05.1 |
HIP 17238 |
13.58 |
| 2026-04-14 00:00 |
03:41:15.89 |
+13:44:27.3 |
HIP 17238 |
13.46 |
| 2026-04-14 12:00 |
03:41:22.30 |
+13:44:49.5 |
HIP 17238 |
13.53 |
| 2026-04-15 00:00 |
03:41:28.73 |
+13:45:11.7 |
HIP 17238 |
13.78 |
| 2026-04-15 12:00 |
03:41:35.18 |
+13:45:33.9 |
HIP 17238 |
14.21 |
| 2026-04-16 00:00 |
03:41:41.67 |
+13:45:56.1 |
HIP 17238 |
14.81 |