メタデータ

項目	値
Designation	415P/Tenagra
Type	P
Perihelion (tp_cal, UTC)	2021-02-16T03:55:08.005440Z
Orbit solution date (soln_date, UTC)	2025-04-09T14:05:50Z
Obs used	199
NEO	-
M1	7.400
K1	19.000
PC	-
Discovery observation (MPC, UTC)	2020-12-25T13:33:49.824000Z
Discovery magnitude (MPC)	21.10 w
Discovery observatory (MPC)	F52 · Pan-STARRS 2, Haleakala

オスキュレーティング軌道要素

項目	値
Epoch (epoch_cal, TDB)	2018-11-04.0000000
e	0.19516380
q (au)	3.311953
a (au)	4.115065
i (deg)	31.789340
Ω (om, deg)	160.325572
ω (w, deg)	346.450161
M (ma, deg)	261.392377

等級

散乱 + 全体線形

$$ M_a = (10.505 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$

モデル定数

項目	値
H0	10.505
n	6.000
gf	1.000
gb	-0.732
k	0.964
δ90	10.000

パラメータ	記号	範囲	説明
太陽・地球距離が1 AUのときの絶対等級	H0	-5 to 20	彗星の固有の明るさ
測光スロープパラメータ	n	2 to 6	太陽距離に対する明るさ変化率
前方散乱非対称係数	gf	0.8 to 1	前方散乱の強さ
後方散乱非対称係数	gb	-1 to -0.5	後方散乱の強さ
分配係数	k	0.8 to 1	前方/後方散乱の寄与比
ダスト/ガス明るさ比	δ90	1 to 10	ダスト散乱とガス放射の相対寄与

参考: EPSC-DPS2025-160

天体暦

Date/Time (UTC)	RA (J2000)	Dec (J2000)	Nearest HIP	Dist from HIP (arcmin)
2026-05-12 00:00	00:32:12.75	-05:46:04.9	HIP 2566	26.92
2026-05-12 12:00	00:32:37.18	-05:45:17.5	HIP 2699	24.52
2026-05-13 00:00	00:33:01.55	-05:44:30.9	HIP 2699	18.45
2026-05-13 12:00	00:33:25.85	-05:43:45.2	HIP 2699	12.43
2026-05-14 00:00	00:33:50.09	-05:43:00.5	HIP 2699	6.56
2026-05-14 12:00	00:34:14.27	-05:42:16.6	HIP 2699	2.32
2026-05-15 00:00	00:34:38.39	-05:41:33.7	HIP 2699	6.39
2026-05-15 12:00	00:35:02.44	-05:40:51.6	HIP 2699	12.20
2026-05-16 00:00	00:35:26.42	-05:40:10.5	HIP 2843	10.61
2026-05-16 12:00	00:35:50.34	-05:39:30.4	HIP 2843	5.99
2026-05-17 00:00	00:36:14.19	-05:38:51.2	HIP 2843	5.57
2026-05-17 12:00	00:36:37.97	-05:38:12.9	HIP 2843	9.86
2026-05-18 00:00	00:37:01.68	-05:37:35.6	HIP 2843	15.29
2026-05-18 12:00	00:37:25.32	-05:36:59.2	HIP 2843	20.98
2026-05-19 00:00	00:37:48.90	-05:36:23.9	HIP 2980	23.56
2026-05-19 12:00	00:38:12.40	-05:35:49.5	HIP 2980	24.36
2026-05-20 00:00	00:38:35.83	-05:35:16.1	HIP 2980	26.45
2026-05-20 12:00	00:38:59.18	-05:34:43.7	HIP 2980	29.54
2026-05-21 00:00	00:39:22.47	-05:34:12.3	HIP 2980	33.35
2026-05-21 12:00	00:39:45.68	-05:33:41.8	HIP 2980	37.65
2026-05-22 00:00	00:40:08.81	-05:33:12.4	HIP 2980	42.29
2026-05-22 12:00	00:40:31.87	-05:32:44.1	HIP 2980	47.15
2026-05-23 00:00	00:40:54.86	-05:32:16.7	HIP 3313	46.60
2026-05-23 12:00	00:41:17.76	-05:31:50.3	HIP 3313	45.00
2026-05-24 00:00	00:41:40.60	-05:31:25.0	HIP 3486	42.75
2026-05-24 12:00	00:42:03.35	-05:31:00.8	HIP 3486	37.23
2026-05-25 00:00	00:42:26.02	-05:30:37.5	HIP 3486	31.77
2026-05-25 12:00	00:42:48.62	-05:30:15.4	HIP 3486	26.41
2026-05-26 00:00	00:43:11.14	-05:29:54.2	HIP 3486	21.21
2026-05-26 12:00	00:43:33.57	-05:29:34.2	HIP 3486	16.30
2026-05-27 00:00	00:43:55.93	-05:29:15.2	HIP 3486	11.99
2026-05-27 12:00	00:44:18.20	-05:28:57.3	HIP 3486	9.16
2026-05-28 00:00	00:44:40.40	-05:28:40.4	HIP 3486	9.23
2026-05-28 12:00	00:45:02.51	-05:28:24.7	HIP 3486	12.12
2026-05-29 00:00	00:45:24.53	-05:28:10.0	HIP 3600	14.93
2026-05-29 12:00	00:45:46.48	-05:27:56.4	HIP 3600	11.85
2026-05-30 00:00	00:46:08.33	-05:27:44.0	HIP 3600	10.83
2026-05-30 12:00	00:46:30.11	-05:27:32.6	HIP 3600	12.36
2026-05-31 00:00	00:46:51.79	-05:27:22.4	HIP 3600	15.69
2026-05-31 12:00	00:47:13.39	-05:27:13.3	HIP 3600	19.91
2026-06-01 00:00	00:47:34.90	-05:27:05.3	HIP 3757	21.24
2026-06-01 12:00	00:47:56.33	-05:26:58.4	HIP 3757	19.33
2026-06-02 00:00	00:48:17.66	-05:26:52.7	HIP 3757	18.80